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Teknologi 5G adalah generasi terbaru dari komunikasi seluler yang menghadirkan kecepatan transfer data yang tinggi dengan bandwidth yang lebar pada beberapa frekuensi kerja yaitu high-band 28 GHz, mid-band 15 GHz, dan low-band 3,5 GHz. Penelitian ini mengusulkan rancangan antena mikrostrip berpolarisasi melingkar yang bekerja pada frekuensi 3,5 GHz untuk sistem komunikasi 5G. Antena dirancang dengan menggunakan substrat FR4 epoxy yang memilki karakteristik ketebalan substrat 1,6 mm, konstanta dielektrik 4,3, dan tangent loss 0,0265. Metode perancangan antena yang digunakan adalah array 2x1 truncated corner dan slit. Hasil simulasi dari perancangan antena menghasilkan nilai return loss -30,7 dB, dan gain 8,427 dB. Dengan menggunakan metode array 2x1, gain antena berhasil ditingkatkan hingga 47,79% serta dengan menambahkan slit nilai return loss berhasil direduksi hingga 94,8%, dan bandwidth berhasil ditingkatkan hingga 230,32% dibandingkan dengan antena mikrostrip rectangular elemen tunggal. Pada penelitian ini juga telah berhasil merancang antena berpolarisasi melingkar dengan nilai axial ratio 1,441 dB.

Antennas are an important component in wireless communication systems that continue to grow in the use of the 2.4 GHz frequency for 4G/LTE applications. Technology in the field of telecommunications has developed very rapidly using wireless communication, which is easily accessible by various devices, for example, Wi-Fi or Wireless Fidelity. Microstrip antenna is one type of antenna that has a narrow bandwidth, small gain. This research aims to widen the bandwidth by designing and manufacturing a truncated corner microstrip patch antenna with a 2x4 array at a frequency of 2.4 GHz with a U-slot. The truncated corner method is used to obtain circular polarization. The truncated corner microstrip antenna is designed by cutting corners. The array method is used to obtain the maximum gain value, while the addition of U-slot aims to reduce the return loss and Voltage Standing Wave Ratio (VSWR) values.

This paper proposes wide band circularly polarized slot antenna with circular stub and corner truncation. Size of this antenna is 25 mm x 25 mm x 1.6 mm on FR4 substrate. On one side of the substrate, non uniform width microstrip line is asymmetrically placed at low current density point to serve as a feed. This avoids design of a balun (balanced-to-unbalanced transformer). On the other side, truncated corner slot with circular stub is used. Circular stub produces circular polarization and the truncation at one corner further enhances the band width. Experimental results confirm the simulated results for the impedance band width from 3.18-19.27 GHz. Circularly polarized waves are also supported in the frequency range of 4.7-6.7 GHz. The maximum gain in the operational band is 5.37 dBi. The advantage of proposed architecture is compact, does not require balun design and operates for both linear and circular polarizations in C-band. [ABSTRACT FROM AUTHOR]

In the development of telecommunications in Indonesia, cellular networks, especially 4G, have grown rapidly since the launch of 4G LTE services. In the implementation of LTE, an antenna that has performance values of bandwidth, working frequency, VSWR, and gain that meets the specifications was needed. This research aims to study a microstrip antenna for LTE applications at a frequency of 2.3 GHz on its effect on the gain and bandwidth parameters using the 21 array method and the truncated corner which was simulated using HFSS software. The microstrip antenna was made using FR4 substrate with a thickness (h) of 1.6 mm and a dielectric constant of 4.4 with an expected working frequency of 2.3 GHz with the desired parameters return loss < -10 dB, VSWR < 1.5, gain > 2 dB, and bandwidth > 200 MHz in the simulation. Based on the simulation results of the microstrip antenna with the 21 truncated corner array method, the return loss value= 18.171 dB, VSWR= 1.281, gain= 3.963 dB, and bandwidth= 283 MHz, which worked at a frequency of 2.3 GHz. Meanwhile, based on the results of the antenna measurements that have been implemented, the return loss value was= 11.07 dB, and the VSWR= 1.49, which works at a frequency of 2.2 GHz.

This paper proposes a simple microstrip patch antenna (MPA) that can reconfigure its polarization states from linear to circular polarization in real-time by means of a PIN diode. An antenna is fed by a 50 O coaxial cable through the substrate of Teflon with relative permittivity of 2.15. The proposed antenna possesses a simple patch with a one-sided corner truncated to achieve polarization reconfigurability. A PIN diode is loaded to connect the main patch with a truncated corner and further maintain dual polarization states such as linear polarization (LP) and circular polarization (CP). Advanced design system (ADS) was used as a simulator to simulate the antenna, and a good understanding was obtained between simulated and measured results. Measured results showed a good agreement with simulated results at all working frequencies of interest. It shows minimum reflection coefficient gain with -10 dB scattering bandwidth 100 MHz for LP states and 170 MHz for CP states. It also shows an axial ratio of 1.56 dB for CP, and the cross-polarization level is also in a satisfying range. [ABSTRACT FROM AUTHOR]

In this paper, we proposed a novel design of U-slotted SIW antenna. Our antenna design is aimed to cover upper K-band and lower Ka-band spectrums, specifically from 24 GHz to 32 GHz. It has a compact square size of 5.2 x 5.2 mm2. We use a rectangular truncated corner to optimize the square radiator. The optimized rectangular truncated corner size of 2 x 0.8 mm2 gives an impedance bandwidth of 7.87 GHz. SIW cavity is constructed by using multiple metallic via-holes which are drilled in a dielectric substrate establishing. Next optimization, applying the U-shaped slot and SIW structure yield a wider impedance bandwidth of 8.89 GHz, there is about 1.02 GHz of impedance bandwidth enhancement. In addition, the SIW structure gives a higher gain of 7.63 dB and decreases the sidelobe level of -12.1 dB. Implementation of the SIW structure significantly decreases the size of antenna while keeping the antenna parameter’s performances.

In this paper, we proposed a novel design of U-slotted SIW antenna. Our antenna design is aimed to cover upper K-band and lower Ka-band spectrums, specifically from 24 GHz to 32 GHz. It has a compact square size of 5.2 x 5.2 mm². We use a rectangular truncated corner to optimize the square radiator. The optimized rectangular truncated corner size of 2 x 0.8 mm² gives an impedance bandwidth of 7.87 GHz. SIW cavity is constructed by using multiple metallic via-holes which are drilled in a dielectric substrate establishing. Next optimization, applying the U-shaped slot and SIW structure yield a wider impedance bandwidth of 8.89 GHz, there is about 1.02 GHz of impedance bandwidth enhancement. In addition, the SIW structure gives a higher gain of 7.63 dB and decreases the sidelobe level of -12.1 dB. Implementation of the SIW structure significantly decreases the size of antenna while keeping the antenna parameter's performances. [ABSTRACT FROM AUTHOR]

A reconfigurable microstrip patch antenna with switchable polarization is proposed in this paper. The proposed antenna consists of a nearly square patch as a radiator truncated at two corners, two small parasitic patches are connected at the corners by using PIN diodes. The impedance bandwidth and axial ratio bandwidth are enhanced by changing the shape of the truncated corners. Good impedance match (S11 < −10 dB) and axial ratio (AR < 3 dB) are achieved at the operating frequency (5.15 GHz). The measured results are well matched with the simulated results and validated the switching operation of the antenna in three polarization states, i.e. left-hand circular polarization, linear polarization, and right-hand circular polarization. The proposed antenna is also tested at high RF power and measured its performance. The proposed antennas are suitable for WI-FI and WLAN applications. [ABSTRACT FROM AUTHOR]

In this work, a novel single-feed stacked microstrip antenna is proposed for high gain and dual polarization application. The designed antenna is useful at two purposes. In one hand, its lower operating frequency demonstrates high gain and on the other hand, the upper operating frequency shows circular polarization. The proposed design consists of two pairs of small parallel slots on the radiating surface as well as in the ground plane with a view to achieving significant amount of gain (approximately 8.3 dB) at its lower operating frequency (~ 6 GHz). An interesting aspect of this work is its polarization diversity. The designed antenna is capable of showing circular polarization at its upper operating frequency (~ 6.8 GHz). At this frequency, the axial ratio of the antenna has been kept below 3 dB for circular polarization applications. This circular polarization has been introduced by truncating the corners of radiating patch at different shapes. High gain and dual polarization play a major role on different antenna performance parameters. This antenna meets these two applications simultaneously. A prototype has been fabricated and characterized in order to validate the results. An outstanding agreement between experimental results and simulated results is achieved. [ABSTRACT FROM AUTHOR]

This paper investigates a wideband and low axial ratio circularly polarized (CP) antenna, which is composed of a monopole on a novel polarization rotating reflective surface (PRRS) based on a corner-truncated artificial magnetic conductor (AMC) structure. By adjusting the dimensions of truncated corner properly, the PRRS has two polarization rotation (PR) frequency points. Then, a large PR band of 18% (5.55–6.65 GHz) can be achieved with two adjacent PR frequency points coming together. The profile of the newly PRRS is only0.04 λ 0. With corner-truncated AMC-based PRRS loading, a measured impedance bandwidth of 1.8 GHz (5.4–7.2 GHz) and the 3 dB axial ratio bandwidth of 1 GHz (5.55–6.65 GHz) could be obtained by the monopole antenna and validated by measurements. The values of AR were well below 1 dB at most of the CP region, which show a perfect CP performance. Moreover, the proposed antenna has exhibited a large axial ratio beamwidth in both the xoz - and yoz -planes and a peak gain of 6.1 dBic within the operational bandwidth. [ABSTRACT FROM AUTHOR]

A novel reconfigurable microstrip-fed patch antenna with polarization agility in either of two bands is proposed in this communication. Frequency reconfigurability is achieved by connecting an additional small patch to the main patch through a p-i-n diode. Each corner is cutoff from the main patch through a narrow L-shaped cut to get polarization reconfigurability. In addition, the impedance and axial ratio bandwidths are enhanced by using the proximity-coupled feed. Both prototypes are designed, fabricated, and tested. The measured results agree well with the simulated results in all cases. Also, the proposed microstrip-fed antenna is tested at high RF input power. The proposed structures are simple, low profile, low cost, and have simple bias circuitry. The proposed antennas are capable of operating in three polarization states, i.e., left-hand circular polarization, linear polarization, and right-hand circular polarization in two frequency bands. The proposed structures are best suited for modern advanced wireless communication systems such as LTE and 5G. [ABSTRACT FROM AUTHOR]

An analysis of broadband truncated corner rectangular microstrip patch antenna loaded with U-slot is presented using equivalent circuit approach based on cavity model. The U-slot and a pair of truncated corner are employed in a rectangular patch to achieve about 80.41% measured impedance bandwidth covering frequency range 2.58–6.05 GHz. It is found that impedance bandwidth highly depends on the truncated corners as well as slots dimensions. The other parameters of the proposed antenna are also studied and compared with the without U-slot truncated corner patch antenna. The maximum gain and efficiency of the proposed antenna are 9.78 dBi and 89.68%, respectively. The theoretical results are compared with simulated and measured results and found in good agreement. [ABSTRACT FROM AUTHOR]