Search

In this paper, a printed graphene compact, low-cost, disposal, flexible and conformal, coplanar waveguide (cpw) fed, linear array antenna is proposed. It was designed for 5.8GHz radars, portable electronic devices, and commercial wireless LAN applications and manufactured by screen printing formulated highly conductive graphene ink on paper substrate. The array achieves 73% total radiation efficiency and a peak gain value of 4.5dBi at 5.8GHz, with its bandwidth ranges from 4.6GHz to 7.9GHz (52.8%). Over the operating frequency, the radiation of the antenna was proved as a typical radiation pattern of a patch antenna array.

Wide band, insensitive incidence angle graphene metasurface for polarization conversion is introduced in this work. A high Polarization Conversion Ratio (PCR) is verified in Mid-Infrared band by using a graphene as an upper conductor for metasurface. The metasurface construction is composed of a single layer of graphene, which has a half ring slots with rectangular slot connecting between them while the whole shape is rotated with 45°. Silicon dioxide substrate is used with a metal backed ground. The simulation results of the proposed metasurface indicate that a linearly polarized incident wave is converted to a circular polarized one over more than one THz along the Mid-Infrared frequency band. PCR has a maximum value of approximately 98% at 1.45 THz. The polarization conversion ratio is studied for different angles of incidence, with stable value for a wide range of incident angles.

This paper introduces design of reconfigurable antenna to operate at 27 GHz for future 5G applications. The frequency reconfigurable coding metasurface (FRCMS) antenna is composed of conventional patch antenna on circular substrate and circular coding metasurface with the same diameter of 15 mm (1.35 λ 0 ). The FRCMS antenna introduces compact size and low profile (thickness = 1.2 mm (0.108 λ 0 )). The coding metasurface is composed of four-unit cells oriented periodically in both vertical and horizontal directions. The operating resonant frequency can be changed by rotating the unit cells mechanically around its center by 90°. The coding metasurface is working as a dielectric substrate. Changing the code sequence affects the equivalent relative permittivity of the substrate and hence the resonate frequency. The FRCMS antenna achieves tunability range from 26.68 GHz to 27.27 GHz. Moreover, it achieves a high realized gain and bandwidth of more than 7 dBi and 600 MHz, respectively.

In this paper, a new two-elements wideband circular monopole array antenna is presented. The array is fed by a new compact two-sections wideband impedance transformer. The transformer is comprised of two unit cells of inductor loaded composite right/left handed (L-CRLH) transmission line. The L-CRLH transformer has a size of 9.3×15.3 mm2 ≡0.54× 1.07 λg2, at mid frequency; 80% miniaturized compared to conventional design. The simulation results confirm that the transformer has a return loss less than 10 dB and insertion loss less than 0.02 dB within the passband. Consequently, the array antenna has wideband 10 dB return loss bandwidth from 1.6 GHz – 3.3 GHz (70%) with 3 dB out of band at 0.95 GHz and 3.95 GHz.

This paper introduces a high power and wideband antenna in L band microwave frequencies. In the antenna configuration, an air suspended stripline (SSL) is used as dielectric medium to have maximum power handling capability. The proposed antenna is inspired from a fork like monopole shape The antenna structure is made from aluminum sheets to have the advantage of low cost. The antenna structure and the excitation transition from coaxial cable to SSL were designed. The antenna functionality was validated using 3D simulation. The results indicate that the antenna is a wideband antenna with good matching properties, omnidirectional pattern, and high radiation efficiency over the frequency band (1.4 GHz to 5 GHz).

In this paper a study of impulse response in time domain is introduced for wide-band antenna. The proposed monopole antenna which was fabricated on flexible substrate has compact area that makes it suitable for wearable applications. Transmission coefficient is measured between two identical antennas. Experimental results are performed while the antennas were in both straight/bent configuration setups in multi-reflections environment. Received pulses in order of ns are calculated for all antenna setups. Cross correlation is applied between input and received pulses in order to comprehend and compare the impulse response for every antenna configuration scenario.

In this paper, we present a compact and high isolated multiband two elements MIMO antenna. The single antenna is based on new capacitor loading of composite right/left handed (C-CRLH) unit cell configuration. A resonant one cell antenna is designed for having triple band at 1.95 GHz, 3.6 GHz and 6.5 GHz. The MIMO configuration has been designed in opposite mirror configuration to have high isolation between the elements without the need of using additional mutual coupling techniques between the elements. The single antenna overall size is 38  28 mm2. The achieved results confirm that the antenna has reflection coefficient less than -10 dB at the three frequencies and transmission coefficient less than -20 dB. The obtained results are achieved using circuit modeling and full wave simulations.

An ultra-thin, compact, highly efficient, antenna based on the Π-section Composite Right/ Left-Handed (CRLH) methodology backed with a 2 × 2 Electromagnetic Band-Gap (EBG) array is presented in this paper. The integrated design operates at 2.45 GHz of the ISM Band with simulated gain and total efficiency of 7.63 dBi and 94.6 %, respectively. Moreover, the antenna is printed over 100 μm flexible substrate while the EBG is printed on 0.8 mm substrate which makes the whole structure low profile. With such results, the integrated design is highly recommended for wearable applications. Results are achieved through circuit model and full wave electromagnetic simulations.

This paper proposed a novel printed graphene based monopole antenna for UWB communication applications. Screen printed graphene laminate with the conductivity of 4.1×104 S/m is used in this paper to replace expensive metal inks. The CPW feed planar monopole antenna has a wideband characteristic from 5 GHz to 13.5 GHz and omnidirectional radiation patterns. Simulated and measured results are compared and discussed in this paper.

In this paper a wideband mutual coupling reduction between two aperture coupled microstrip (ACMS) antennas, is introduced. The antennas are functioning from 17 - 31 GHz which is in the region of the Ka-band for the satellite communication (SatCom) applications. The mutual coupling has been reduced by using a periodic meta-surface structure (J-cross) unit to achieve wideband isolation in the Ka (uplink) band of 17-31 GHz. Reduction of the mutual coupling has been proven efficient on employing it in array or MIMO antenna applications.

A low profile, flexible, circularly polarized antenna based on the artificial material methodology is introduced in this paper. The antenna footprint is 20 mm × 15 mm, where it is excited by the Co-Planar Waveguide (CPW) configuration. Flexibility is achieved by incorporating Rogers Ultralam 3850 as the antenna substrate. By protruding an inverted T-shaped slot from the radiator to the extended CPW ground plane, circular polarization was achieved. The design radiates at 5.2 GHz with a −10 dB bandwidth of 29.7 MHz, gain of 0.7 dBic, boresight Axial Ratio (AR) of 0.86 dB, and 3 dB-AR bandwidth of 64.3 MHz. With such characteristics, the antenna is targeting wearable and Wireless Local Area Network (WLAN) applications.

This paper presents the design, fabrication and measurement of a planar inverted F-shaped monopole antenna printed by graphene nanoflakes conductive ink. With the use of simple inverted-F shaped monopole structure, 2.4/5 GHz bands are excited to be used in WiFi band WLAN applications.

This paper introduces a compact asymmetric coplanar strip (ACS)-fed composite right/left handed (CRLH) multiple input multiple output (MIMO) antenna for multiband operation. The ACS-fed MIMO antenna is designed using two triple band antenna elements, operating at 4.6 GHz, 4.9 GHz and 5.4 GHz with good matching (reflection coefficient is less than −20 dB). By using mushroom like electromagnetic bandgap structure, further mutual coupling isolation (better than 30 dB) is achieved. The overall MIMO antenna size is compact (46.5 × 26 mm2). The MIMO antenna has less than 0.02 envelope correlation coefficient (ECC) and maximum than 9.98 dB diversity gain. The results are simulated using full wave simulations.

In this paper a sharp compact stopband filter is introduced based on unbalanced dual composite right left handed D-CRLH unit cell. The designed stop band can be used to suppress any undesired signals in WLAN frequencies. The filter works for applications in C-band, where the allocation receiving frequency of the standard C-band. The cutoff frequencies of the proposed filter are 3 GHz and 5 GHz. Moreover, the proposed filter has a very sharp stopband response. The filter size is only 0.329 λ g × 0.609λ g where λ g is the guided wavelength at 4 GHz.

In this paper, a two-element circular monopole antenna array is designed and tuned through a graphene sheet. A CPW fed is used to feed the antenna array. The graphene sheet is added under a CPW fed network of the antenna array. Thanks to the graphene sheet, the antenna array is operated to serve more applications with enhanced gain. The antenna array with the graphene sheet is designed and simulated. Simulated results are discussed and illustrated in the following sections.

This paper presents mutual coupling reduction between, typical 5.8 GHz microstrip, antenna elements in both longitudinal and lateral directions. A bilateral complementary electromagnetic band gab structure, engraved in the ground, is used for such purpose. Four, side by side with λo/2 separation, antennas were tested for lateral isolation before and after applying CEBG. 18 dB isolation, enhancement was achieved. For longitudinal isolation two opponent elements with O.06λo separation were tested and 16dB enhancement was achieved.

In this paper, a dual-band, flexible antenna is suggested. The low profile antenna, 35 × 20 mm2, is fed using the well known Co-Planar Waveguide (CPW) configuration, where it operates at 2.44 GHz and 5.8 GHz of the Industrial Scientific and Medical (ISM) radio band. By employing the flexible Rogers Ultralam 3850 as the antenna substrate, the proposed antenna exhibited high flexibility. Due to its compactness, flexibility and dual-band resonance at the ISM band, the antenna is highly chosen to be applied for wearable applications.

A metasurface absorber is designed in the THz band in order to investigate the field polarization. the conventional SRR and the proposed structure are investigated, firstly by applying X-polarized electric field on both cells and secondly applying Y -polarized electric field on both cells. as a result the conventional SRR reflects the incident electric field when the electric field is X-polarized and absorb when the electric field is Y -polarized. in case of the proposed structure is checked, it absorbs the incident wave in both directions of electric field polarization and the absorption is enhanced greater than the conventional one.

A modified uni-planar compact electromagnetic bandgap structure (UC-EBG) is proposed to suppress the surface waves excited in between two rectangular microstrip patch antennas (RMSP). The antennas are functioning at WLAN applications at 5.8 GHz. The unit cell dimensions of the proposed modified UC-EBG are 7.3 mm×5.8 mm (20 % miniaturization of conventional U C- EBG). The patches are placed apart by 10 mm (0.2 λ0) edge to edge. Thanks to the modified U C- EBG cell, the mutual coupling between the two patches is improved by 45 dB and 2.5 dB compared to cases without using EBG and using conventional UC-EBG, respectively.

A new compact power divider based on inductor loaded composite right/left-handed transmission line (L-CRLH) is presented in this paper. The proposed power divider size is only 17.3 × 15.4 mm2, (0.53×0.47) λ2 g at mid frequency. The results show 3 dB insertion losses and 14 dB return losses at each output port in the frequency band 5 GHz to 6.5 GHz. Moreover, the power divider has filtering function

In this paper a new designed thin wide band antenna is introduced. The proposed monopole antenna which was fabricated on flexible substrate has compact geometry area of 51 ⨯ 22 mm2 that makes it suitable for handheld applications. The antenna was featured with three rectangular slabs at the bottom layer in order to improve boresight gain performance over spectrum of operation. Moreover., the antenna produces semi omni directive radiation and has radiation efficiency more than 90 % over its bandwidth of operation. The antenna design along with simulation and experimental results are presented in this work.

This paper presents a compact, two elements MIMO antenna systems with a size of 57.2 × 57.2 mm2. The antennas have mutual coupling reduction over a wide band of 2.35 GHz to 2.65 GHz. It consists of two monopole triangle self-complementary antenna elements (TSCA). The simulation results show that the proposed MIMO antenna configuration has below enhanced mutual coupling which goes lower than −20 dB (an enhancement by more than 10 dB compared to conventional configuration). The obtained results are simulated using fullwave simulations.

A wideband, flexible printed antenna, fed via the Co-Planar Waveguide (CPW) geometry, with high gain is presented in this paper. The high gain was realized by using a reflector on the same level with the radiator and around it. The high gain performance of the antenna was observed throughout the whole wide spectrum of 1.53 GHz to 2.74 GHz, with a percentage bandwidth of approximately 57%. For flexibility, the antenna was printed on the flexible Rogers Ultralam 3850 substrate. With such characteristics, the antenna can be recognized in a number of wireless applications; such as, WLAN, WI-Max and RFID, as well as, wearable applications.

Crosstalk between printed-circuit board (PCB) neighboring routes is the most critical factor affecting signal quality in high-density and high-frequency electronic circuits. A technique based on employing graphene sheet as a coating layer for microstrip lines is investigated in this work. The test structure of two parallel microstrips is treated as symmetrical 4-port network and S parameters simulation is processed. It has been successfully demonstrated by simulation and comparison with all previous techniques that, graphene coated microstrip lines give the best optimum low values for the peak voltage of near-end crosstalk and far-end crosstalk jointly, with very low attenuation in the transmitted power absorbed by graphene coating layer. It also has great potential in offering low cost, lightweight and flexible shielding material.

The design of two band pass metamaterial filters with high selectivity based on the coupling matrix technique is presented. The design methods discussed below are applied to metamaterial split ring resonators (SRRs) of second order but of differing feed structure. The high selectivity requirement of the second proposed filter is fulfilled through the use of a 0° feed structure which furnishes the filter response with two transmission zeros. The proposed band pass filters are devised to adhere to wireless LAN application requirements with a center frequency of 2.4 GHz. Both the simulated and measured results of the proposed filters show an insertion loss below 0.7 dB within the pass band range. The final proposed filter boasts a compact size of only 3 χ 2 cm2 due to the use of SRRs.

ZigBee is considered as one of the most commonly used standards in wireless sensor networks (WSNs). Minimizing the effect of multipath fading channels is crucial for any network performance. This paper investigates the influence of fading channels on the performance of ZigBee using IEEE 802.15.4 PHY layer with direct sequence spread spectrum (DSSS) technique and offset quadrature phase shift keying (OQPSK) modulation. Least mean square adaptive linear equalizer (LMS ALE) is combined to the system to minimize the channel effects. Performance and design analysis are presented in details. In addition, two design optimization procedures for the adaptive equalizer based on genetic algorithm (GA) and particle swarm optimization (PSO) are proposed. The multi-objective optimizations aim to choose the equalizer design parameters that achieve the optimum ZigBee transceiver steady-state and transient performance. For verification purposes, the proposed design is simulated and tested in MatLab environment at different network scenarios. The results certify the ability of the proposed technique to extract the original transmitted signal at the receiver with minmum bit error rate (BER) and maximum speed of adaptation.

Over the last few years, manipulation of digital images for forgery purpose with high quality has become popular using low-cost acquisition devices. Discrimination between tampered images and authentic images is required to ensure the origin of the data carried by images. In this paper, high-pass filtering and histogram equalization are used as pre-processing stages to reinforce the details of the images prior to forgery detection. The detail reinforcement process can achieve high classification accuracy. Illumination histogram is estimated after pre-processing and the peak value of the histogram derivative is estimated and used as a metric for forgery detection. The philosophy behind this strategy is that in the case of forgery, the forged regions are subject to different illumination conditions, and hence this can be reflected in the illumination histogram peaks. A thresholding approach is adopted in this paper. Probability Density Functions (PDFs) of the histogram derivative peaks are adopted for classification.

Hand Gesture Recognition (HGR) system has become essential tool for deaf-dumb people to interact with normal users via computer system. This paper proposes robust and fast system for HGR that is based on dimensionality reduction of histogram of oriented gradients feature vectors by applying principal component analysis without losing performance, besides reducing computational cost and memory requirements. Multi-class Support Vector Machine (SVM) and k-Nearest Neighbors (KNN) classifiers are used to classify the hand gestures. The proposed algorithm achieves average recognition rate of 97.69% under different hand poses and complex background with changes in lightning. Our proposed algorithm reduces gesture matching computational cost and memory requirements by 98.6%. Experimental results show that average accuracy with KNN classifier are better than with SVM classifier. The results also show that our descriptor is robust against multiple variations such as rotation, scale, translation, and lighting while provides good performance.

Sign Language Recognition is an essential research problem for enabling communication with deaf-dumb people. Sign language recognition system confronts many challenges such as complex background, illumination changes, translation, rotation, and scale problem, besides system requirements such as time of recognition, robustness, performance, and computational efficiency. This paper proposes hybridization between two strong descriptors including Histogram of Oriented Gradients (HOG) and Edge Oriented Histogram (EOH) to achieve better recognition rate with relatively low memory requirements. A new feature descriptor is used as a combined feature descriptor, which joins the advantages of each descriptor to achieve good performance. Multi-class support vector machine classifier is utilized to classify the hand gestures. Experimental results demonstrate that the proposed system gives recognition rate of 96.15 % for 1AASVM classifier and 99.23 % for 1A1SVM classifier under different hand poses and complex background with changes in lightning conditions.

A four-way ultra-compact power divider is proposed in this paper for antenna array applications. The power divider is constructed based on composite right/left handed microstrip structure. The analytical analysis are presented. The divider operates at 5.2 GHz for WLAN services. This paper introduces equivalent circuit, 3D full wave simulation, and in addition to that, this design realizes compactness size 20×6 mm2, (0.62×0.186) λ2g.

In this paper, a two elements UWB (3.1 GHz–10.6 GHz) MIMO antenna is presented. A notch frequency at 5.8 GHz is interpolated within the UWB spectrum by using a dual of electromagnetic bandgap cells coupled to the antenna feeding line. By introducing a system of electromagnetic bandgap cells between the two antennas elements, the achieved results demonstrate nearly below −10 dB reflection coefficient over the spectrum and −1 dB at the notch frequency. Also, deposition between the two antennas is achieved to exceed 20 dB. The obtained results are simulated using full wave simulations.

In this paper, the use of different asymmetric composite right/left handed antennas is presented. Two different geometries are reported for triple band and small antenna size. The asymmetric configuration is created by using two opposite meandered line inductors and two / three interdigital capacitors. The antennas have omnidirectional pattern at the three bands which makes the antenna suitable for applications in different Wi-Fi/WiMAX applications. Prototype has been fabricated in order to validate the simulation results.

This paper presents a compact, dual-band, flexible, Co-Planar Waveguide (CPW)-fed antenna. The compact size is achieved by employing meander line technique. The antenna is implemented on a flexible substrate, Gil GML 1034; thus, it is appropriate to be realized for wearable applications. Dual-band is attained at 2.4 GHz of the ISM Band and 5.2 GHz, respectively. Hence, serving the Radio Frequency Identification (RFID) and Wireless Local Area Network (WLAN) applications.

Design, fabrication and analysis of graphene based resonators at microwave frequencies are presented. Chemical Vapor Deposited (CVD) graphene is used to fabricate the resonating stub, where Raman spectroscopy has been adopted to confirm the layer number of graphene. The measurements were carried out from 12 GHz to 28 GHz. The results of graphene resonator's input impedance show that graphene could work well as a resonating unit in the short-end resonating structure, demonstrating that graphene based resonators can find a lot of applications in developing guided graphene based devices at microwave frequencies.

In this paper, we introduce new configuration of ultra compact implantable antenna. The antenna is designed using the inductor loaded composite right left handed geometry in substrate integrated waveguide configuration. The antenna is designed for the IMS biomedical band with center frequency = 2.42 GHz at which the return loss is less than 15 dB. The antenna has small size (15×15 mm2) with 6 mm feed length. The designed implantable antenna size is only 3.5 % compared to conventional microstrip patch antenna. The obtained results are achieved using full wave simulations.

A frequency re-configurable single/multi bands antenna is proposed. It consists of a rectangular patch antenna and PIN diode controlled Meta-Surface, placed on the top of the patch. Square Split Ring Resonator (SRR), controlled with PIN diodes, acts as the unit cell of MS layers, which are periodically placed in both X and Y direction. The total size of the antenna is 80cm. Physical rotation of Metasurface, accompanied by PIN diodes' configurations, lead to achieve compact single/multi bands reconfigurable antenna. The design concepts, supported by electromagnetic full wave simulation, are presented. The results confirm that the designed antenna can be reconfigured to switch to several single bands and to several multi bands as well.

This paper represents an ultra-compact quad band resonator based on novel configuration of dual-composite right/left handed transmission line. This design broaches quad band for 7.3 GHz, 8.3 GHz, 11.9 GHz, and 13.8 GHz along with insertion losses of 2.2 dB, 0.27 dB, 2 dB, and 1.5 dB, respectively. Furthermore, the return losses are 12.2 dB, 36 dB, 20.5 dB, and 19.5 dB, respectively. The quality factor proclaims selectivity equals 42.33, 15.58, 15.87, and 31.1, at the four frequencies respectively. The paper amplifies the equivalent circuit design, mathematical study, and 3D full-wave simulation. Additionally, the design actualizes a compactness size of 13.2 × 16.5 mm2 (0.548 × 0.6855 λ g 2).

In this paper a new configuration for a flexible wide band CPW fed slot antenna is introduced. The proposed slot antenna was simulated on a flexible substrate has compact geometry area of 34 × 25 mm2 qualifies it to meet the integration requirements of small indoor receiver applications. The structure of the slot antenna was designed to achieve circular polarization over wide band. Moreover, the antenna has good far field radiation characteristics over the bandwidth. The design principals along with simulation results are presented in this work.

In this paper, a novel technique to reduce the antenna size of a metamaterial-inspired antenna has been presented by loading an additional conductor beneath the antenna structure. Initially, an open circuited antenna is presented which weakly couples to the ground and then, an extra plane is introduced which strongly couples to the ground resulting in lower resonant frequency. The designed structure offers compact size having overall dimensions of 0.45 λo × 0.11 λo × 0.01 λo (λo is the free space wavelength) at a center frequency of 2.73 GHz with an impedance bandwidth of 33.7%. The size of the proposed structure is reduced by 32% at a small expense of bandwidth as compared to initial design.

UWB MIMO with four elements antenna is introduced in this paper. The asymmetric coplanar strip (ACS) is used to feed the MIMO antenna. The single antenna element consists of quarter elliptical ring radiator. The proposed antenna has size of (6 × 5) cm2. The distance between the edge to edge points of the antenna elements equals 0.37 λ 0 between antenna 1 and 2 and 0.14 between antenna 1 and 3 at 3 GHz. The proposed MIMO antenna is across the 3 GHz to 10.6 GHz bandwidth with a reflection coefficient lower than −10 dB. Also, the insertion loss lower than 18 dB. The envelope correlation coefficient is calculated to evaluate MIMO performance.

This paper introduces an ultra-wide band (UWB) band pass filter (BPF) with a coupled T-shaped stub. The filter's lower cut-off frequency and higher cut-off frequency are around 3.2 GHz and 9.7 GHz respectively. Moreover, the pass band exhibits two narrow notches at 5.9 GHz and 7.8 GHz which minimize the interference effects of the proposed filter with both the wireless local area network (WLAN) and SATCOM systems, respectively. The main pass band of the filter and the upper notch are implemented using a stepped impedance resonator, coupled with an inter-digital feeding line backed by defected ground structures (DGS) for coupling augmentation. The lower notch band is implemented using a stepped impedance stub that is grounded through a via hole at one end and coupled to the main filter form at the other end. The proposed filter features a small size of 0.443× 1.534 λ g 2.

This paper presents the design of a metamaterial MIMO antenna which operates at 5.8 GHz. The left handed single cell of series capacitor and shunt inductor are considered the main block of the antenna elements. The configuration of the shunt stub is reversed to achieve lower coupling between the antenna elements The small size of only 2.93cm×2.6cm and high isolation of more than 35 dB are considered to be the main advantageous of the proposed metamaterial MIMO design. Experimental measurements of the fabricated antenna design agree with simulation results.

A design of compact size and multi-band composite right-left handed meta-material antennas for wireless applications is presented. The proposed antenna consists of single left handed cell. The series interdigital capacitor and short circuit stub which acts as shunt inductor are considered the main block of the proposed antenna. The proposed antenna is designed to operate at different frequency bands. Because of the nonlinearity of the left handed region of the composite right left handed transmission line, the compactness of the antenna has been achieved. The proposed antenna has compact size (its size is only 28 × 22 mm2). The design represents size reduction of approximately 60 % compared to conventional patch antennas operating at the same frequencies. The antenna is designed, simulated and measured. A good agreement is achieved between the measured and simulated results.

This paper is composed of two parts. First, we explain the basic concepts of general composite right / left handed transmission line designs using ferrite medium. We explain its different analysis unlike conventional dielectric case. Hence, the ferrite left handed transmission line properties are emphasized compared to dielectric one. Second, we present some novel microwave device applications based on ferrite left handed transmission lines. The theories of these devices are based on the concepts introduced in the first part. These applications comprise quarter wavelength transformers and zeroth order resonator. Such applications have the advantages of compact size in addition to the tunability properties. Moreover, the proposed devices require small DC magnetic bias.

A compact dual ultra-wide band power dividers based on three cells of dual composite right/left handed microstrip structure presented in this article. This introduced topology proposes dual band for multiband orthogonal frequency division multiplexing from 1 GHz–4.8 GHz with insertion loss −5 dB for three way power divider. The second band designed for direct sequence ultra-wideband from 6.2 GHz–9.5 GHz with insertion loss −5.2 dB for the divider. The rejection band extended from 5 to 5.8 GHz is introduces to avoid the interference between WLAN and UWB applications. The article elaborates the equivalent circuit model, analytical study, 3D full wave simulation and fabrication measurement results. Furthermore, the design realizes compactness size 45.37 % over conventional T-junction power divider, and also, realizes compactness size 30.05 % over the most recently compact dividers.

This paper presents a new compact metamaterial bandpass filter based on coupled gap composite right left handed transmission line resonator using substrate integrated waveguide to become low loss. The filter size is only 20 × 15 mm2 which is (0.61 λ g ) at center frequency (6.8 GHz). Moreover, the filter was designed to demonstrate a zeroth order at 6.8 GHz with two transmission zeros; the first one is at −44 dB and the second one is close to −50 dB in a high selective characteristics (less than only 300 MHz from centre frequency). The paper exhibits the equivalent circuit model, 3D full wave simulation and fabrication measurement results. Good agreement between the presented data is achieved.