Triple-Band Dual-Sense Circularly Polarized Hybrid Dielectric Resonator Antenna
Amir Altaf, Munkyo Seo
Sensors · 2018
doi:10.3390/s18113899 (opens in a new tab)
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Abstract
In this paper, a triple-band dual-sense circularly polarized (CP) hybrid dielectric resonator antenna is proposed. A modified hexagonal dielectric resonator (DR) is top-loaded with a square microstrip ring (SMR). A vertical-tapered-strip connected to a 50-<inline-formula> <math display="inline"> <semantics> <mo>Ω</mo> </semantics> </math> </inline-formula> microstrip line is used to excite the proposed antenna. It is found that the lower and central CP bands correspond to left-handed circular polarization and are produced by the TM<inline-formula> <math display="inline"> <semantics> <msub> <mrow></mrow> <mn>11</mn> </msub> </semantics> </math> </inline-formula> and TE<inline-formula> <math display="inline"> <semantics> <msub> <mrow></mrow> <mn>111</mn> </msub> </semantics> </math> </inline-formula> modes of the SMR and modified hexagonal DR, respectively. The upper CP band is formed by the combination of the quasi-TM<inline-formula> <math display="inline"> <semantics> <msub> <mrow></mrow> <mn>21</mn> </msub> </semantics> </math> </inline-formula> mode of the SMR and quasi-TE<inline-formula> <math display="inline"> <semantics> <msub> <mrow></mrow> <mn>111</mn> </msub> </semantics> </math> </inline-formula> mode of the DR that exhibits right-handed circular polarization. The measurement results of the fabricated prototype show triple-band response for |S<inline-formula> <math display="inline"> <semantics> <mrow> <msub> <mrow></mrow> <mn>11</mn> </msub> <mrow> <mo>|</mo> <mo><</mo> </mrow> </mrow> </semantics> </math> </inline-formula> −10 dB with impedance bandwidths (IBWs) of 17.4% (1.75⁻2.03 GHz), 28.13% (2.23⁻2.96 GHz), and 2.97% (3.65⁻3.76 GHz) in the lower, central, and upper bands, respectively. The measured 3 dB axial ratio bandwidths lying within −10 dB IBWs are 3.69% (1.86⁻1.93 GHz), 5.46% (2.67⁻2.82 GHz), and 2.15% (3.68⁻3.76 GHz) along with the peak gains of 5 dBic, 5.28 dBic, and 2.36 dBic in the lower, central, and upper bands, respectively.
Abstract licence: CC BY
References26
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