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A multiband half‐mode substrate integrated waveguide (HMSIW) slotted antenna is developed for ISM/WiMAX/WLAN applications. HMSIW technique has been utilized to acquire antenna compactness. Two inverted L‐shaped slots of half wavelength are embedded onto a HMSIW rectangular cavity for attaining a hybrid mode (i.e., Half‐mode of TE110+ ${\mathrm{TE}}_{110}+\phantom{\rule{}{0ex}}$ Half‐mode of TE120 ${\mathrm{TE}}_{120}$), which induces a lower resonance at 2.4 GHz. An inverted L‐shaped slot is influenced to radiate hybrid mode at 2.4 GHz, while the innermost inverted L‐shaped slot radiates modified TE110 ${\mathrm{TE}}_{110}$ mode at 3.30 GHz. A multiband is obtained by amalgamation of hybrid mode (at 2.4 GHz), modified TE110 ${\text{TE}}_{110}$ mode (at 3.30 GHz) and modified TE120 ${\mathrm{TE}}_{120}$ mode (at 5.38 GHz). The radiating modes are elucidated by using mode theory methodology for ascertaining the resonance characteristics of the prototype antenna. The antenna parameters have been optimized by artificial neural network technique using MATLAB. The antenna geometry possesses a shrinkage size of 30 × 16 × 1.6 mm3, which has been designed on FR‐4 substrate. To vindicate the simulated consequence, the fabricated prototype has been tested. It contributes the fractional bandwidth of 6.4% (2.09−2.23 GHz) in the hybrid mode at 2.18 GHz, 9.03% (2.89−3.17 GHz) in the half cavity mode TE110 ${\mathrm{TE}}_{110}$ at 3.10 GHz and 9.96% (5.11−5.65 GHz) in the half cavity mode TE120 ${\mathrm{TE}}_{120}$ at 5.42 GHz, respectively, which is beneficial for ISM, WiMAX and WLAN band wireless applications. [ABSTRACT FROM AUTHOR]

A dual-band substrate integrated waveguide (SIW) cavity backed antenna loaded with complementary split ring resonator (CSRR) metamaterial is proposed for WiMAX/WLAN band applications. This antenna uses a rectangular cavity and CSRR slots on the ground plane for dual band radiation. The rectangular SIW cavity resonator produces two cavity modes TE 110 and TE 120 into free space owing to array of metallic vias. By introducing CSRR, it excites the lower hybrid modes for realizing a low-profile antenna design at 2.5 GHz due to strong coupling effect in the SIW cavity resonator. The mode theory mechanism is utilized for analysis the designed antenna. The geometry of the fabricated antenna is developed on a low cost FR-4 dielectric substrate with dimensions 30 × 30 × 1.6 mm3 to resonance at 2.5 GHz and 5.4 GHz. The experimental S 11 (dB) exhibits a fractional bandwidth of 4% (2.45–2.55 GHz) in the lower resonant frequency of 2.5 GHz and 2.4% (5.33–5.46 GHz) in the higher resonance frequency of 5.4 GHz. The designed antenna possesses significant advantages of low-profile, better S 11 (dB), planar configuration and unidirectional radiation patterns. [ABSTRACT FROM AUTHOR]

Abstract: A miniaturized multiband printed monopole antenna is reported using hexagonal complementary split ring resonator (HCSRR) slots. Antenna miniaturization and multiband are accomplished by employing metamaterial inspired structure HCSRR. The proposed antenna consists of three HCSRR slots, it makes the antenna to resonate at 1.62 GHz, 2.4 GHz, 3.3 GHz, and 5.8 GHz frequency bands. The designed antenna structure has a small size of 20 × 20 × 1.6 mm3, which is fabricated on an FR‐4 substrate with dielectric constant ɛ r of 4.4. The pass band characteristics of HCSRR are examined in detail for acquiring multiband abilities of the compact antenna, which is evaluated by use of the precise LC equivalent circuit design equations. The metamaterial property of the HCSRR is also studied to validate the resonance frequencies of the proposed antenna. Simulated and tested data are investigated. The prototype antenna has adequate advantages, with a simple structure, compact size, multiband, and uniform radiation patterns. [ABSTRACT FROM AUTHOR]

A miniaturized dual-band antenna is proposed for industrial scientific and medical (ISM), worldwide interoperability for microwave access (WiMAX), and wireless local area network (WLAN) applications. The proposed antenna consists of hexagonal complementary split-ring resonator (HCSRR), metamaterial-inspired split-ring structure, and a partial ground plane. The prototype antenna is fed by 50-Ω microstrip feed line, which is printed on a 30 × 30 × 0.8 mm3 FR-4 substrate. HCSRR in the radiating element is used to create a new resonance at 2.4 GHz for achieving dual-band characteristics. A split in the outer hexagonal ring induces a magnetic resonance which leads to improvement of the bandwidth of the antenna. The proposed antenna is fabricated and measured. The measured -10-dB impedance bandwidths are 180 MHz (2.42–2.60 GHz) and 2400 MHz (3.44–5.84 GHz) with a resonance frequency of 2.56 GHz and 4.64 GHz, respectively, which is suitable for ISM, WiMAX, and WLAN applications. Analysis of HCSRR is discussed in detail using empirical design equation with metamaterial property. The prototype antenna has suitable radiation characteristics for all resonance frequencies. [ABSTRACT FROM AUTHOR]

In this paper, a miniaturized ELC (Electric-inductive-capacitive) based dual-band antenna is proposed for WiMAX and WLAN Applications. The designed antenna consists of a ring monopole antenna coupled with ELC resonator and partial rectangular ground plane, which is fed by 50Ω microstrip transmission line. ELC metamaterial modifies the current direction and yields dual-band characteristics. The band characteristics of the ELC metamaterial element are explained in detail. The proposed antenna with a compact size of 30 × 30 × 0.8 mm3 is fabricated on a FR-4 substrate of thickness of 0.8 mm, with relative dielectric constant εr= 4.4 and loss tangent tanδ = 0.002. The experimental results cover the bandwidth of 500 MHz (3.57-4.04 GHz) and 860 MHz (4.73-5.59 GHz) with a resonance frequency of 3.74 and 5.1 GHz, respectively, which is suitable for WiMAX and WLAN applications. [ABSTRACT FROM AUTHOR]