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Book ChapterDOI

Extended Microstrip Line-Fed Circularly Polarized Dielectric Resonator Antenna for WiMAX and 5G Applications

TL;DR: In this paper, a cylindrical dielectric resonator antenna (CDRA) with a meandered-shaped microstrip feedline was proposed for wireless band applications.
Abstract: In this paper, a unique, simple, and concise structure of a circularly polarized (CP) cylindrical dielectric resonator antenna (CDRA) usable for wireless band applications is proposed. The CDRA is excited by a meandered-shaped microstrip feedline ending with a circular extension. The combined effect of this feeding mechanism along with a partial ground plane satisfies the criteria for generating circular polarization. The proposed design is operating in the frequency range of 2.80–3.41 GHz centered at 3.39 GHz with an axial ratio (AR) bandwidth of 9.14% and peak gain of 3.9 dBi. The designed structure exhibits 3-dB axial ratio beamwidth (ARBW) of 42° and 102° with ARmin of 0.54 dB and cross-polarization discrimination (XPD) of 30 dB and 31 dB in two principal planes at ϕ = 0° and ϕ = 90°, respectively. The reconfigurability between left-hand CP (LHCP) and right-hand CP (RHCP) field can be obtained by taking the mirror image of the extended meandered-shaped microstrip feedline. The antenna can be preferred for different wireless applications such as WiMAX and 5G.
References
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Journal ArticleDOI
TL;DR: In this article, a wideband circularly polarized (CP) L-slot antenna single fed by L-shaped feed line is designed, which truncates one of the corners of the antenna element.
Abstract: A wideband circularly polarized (CP) L-slot antenna single fed by L-shaped feed line is designed. Wideband CP is obtained by truncating one of the corners of the antenna element. This arrangement introduces orthogonal components with quadrature phase difference to excite circularly polarized wave. A bandwidth of 46.5% (2.18-3.5 GHz) is achieved with an dB and dB. Good agreement between measured and computed results is achieved. Moreover, parametric study results are presented.

167 citations

Journal ArticleDOI
TL;DR: In this article, a circularly polarized rectangular stair-shaped dielectric resonator antenna (DRA) is presented, which is excited by a narrow rectangular slot and rotated 45/spl deg/ with respect to the sides of the DRA to generate circular polarization.
Abstract: A circularly polarized rectangular stair shaped dielectric resonator antenna (DRA) is presented. The DRA is excited by a narrow rectangular slot and rotated 45/spl deg/ with respect to the sides of the DRA to generate circular polarization. A parametric study of the length to width ratio to optimize the axial ratio bandwidth is given. A 3 dB axial ratio bandwidth of 10.6% is achieved when the length to width ratio is 1.9.

161 citations

Journal ArticleDOI
TL;DR: In this paper, a wideband circularly polarized (CP) trapezoidal dielectric resonator antenna (DRA) is investigated, which is simply excited by a single 45° inclined slot fed by a microstrip feed line.
Abstract: A wideband circularly polarized (CP) trapezoidal dielectric resonator antenna (DRA) is investigated in this letter. The DRA is simply excited by a single 45° inclined slot fed by a microstrip feed line. It is found that the 3-dB axial ratio (AR) bandwidth of the proposed antenna can be as wide as 21.5%. The antenna gain varies between 5.28 and 8.40 dBi across the antenna passband (3.11-3.86 GHz). This letter also presents a modified trapezoidal DRA that has a notch at its top. The modified version improves the impedance match, as the AR and gain remain almost unchanged. The reflection coefficient, AR, radiation pattern, and antenna gain of each proposed configuration are studied, and reasonable agreement between the measured and simulated results is observed.

152 citations

Journal ArticleDOI
TL;DR: In this paper, a low-cost method for generating circular polarization in a dielectric resonator antenna is proposed, which consists of four rectangular layers, each one being rotated by an angle of 30 degrees relative to its adjacent layers.
Abstract: A novel low-cost method for generating circular polarization in a dielectric resonator antenna is proposed. The antenna comprises four rectangular dielectric layers, each one being rotated by an angle of 30 ° relative to its adjacent layers. Utilizing such an approach has provided a circular polarization over a bandwidth of 6% from 9.55 to 10.15 GHz. This has been achieved in conjunction with a 21% impedance-matching bandwidth over the same frequency range. Also, the radiation efficiency of the proposed circularly polarized dielectric resonator antenna is 93% in this frequency band of operation

126 citations

Journal ArticleDOI
TL;DR: In this article, a dual-band antenna with right-hand circular polarization for the first frequency and the counter polarization at the second frequency is realized with compact printed spiral slots, fed by a 50 Ω microstrip line.
Abstract: A dual-band antenna with right-hand circular polarization for the first frequency and the counter polarization at the second frequency is realized with compact printed spiral slots. The coupled spiral slots are fed by a 50 Ω microstrip line. Dual-sense circularly-polarized performance is achieved by realizing oppositely-directed current rotation for the two frequency bands. A parametric study shows that the additional slot significantly improves the bandwidth for both frequency bands. Measured results show that the fractional impedance bandwidth is greater than 18% for both bands. The 3 dB axial-ratio bandwidths are 4.5% and 3.5% for the RHCP and LHCP bands, respectively.

79 citations