Circularly polarized cylindrical dielectric resonator antenna excited by square ring slot with a T-shaped microstrip line

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- Ω 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 11 and TE 111 modes of the SMR and modified hexagonal DR, respectively. The upper CP band is formed by the combination of the quasi-TM 21 mode of the SMR and quasi-TE 111 mode of the DR that exhibits right-handed circular polarization. The measurement results of the fabricated prototype show triple-band response for |S 11 | < −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.

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Microstrip Line Fed Wideband Circularly-Polarized Dielectric Resonator Antenna Array for Microwave Image Sensing

IEEE Sensors Letters ◽

10.1109/lsens.2017.2696580 ◽

2017 ◽

Vol 1 (3) ◽

pp. 1-4 ◽

Cited By ~ 7

Author(s):

Biswarup Rana ◽

Susanta Kumar Parui

Keyword(s):

Antenna Array ◽

Dielectric Resonator ◽

Microstrip Line ◽

Dielectric Resonator Antenna ◽

Circularly Polarized ◽

Image Sensing ◽

Microwave Image

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A New Wideband Circularly Polarized Dielectric Resonator Antenna Loaded with Strips

International Journal of Antennas and Propagation ◽

10.1155/2021/9966495 ◽

2021 ◽

Vol 2021 ◽

pp. 1-9

Author(s):

Lichao Hao ◽

Hao Wang ◽

Bo Li ◽

Wenting Yin

Keyword(s):

Dielectric Resonator ◽

Microstrip Line ◽

Impedance Matching ◽

Ground Plane ◽

Axial Ratio ◽

Electromagnetic Energy ◽

Dielectric Resonator Antenna ◽

Circularly Polarized ◽

Resonant Point

This paper proposes a novel wideband circularly polarized (CP) dielectric resonator antenna (DRA) loaded with strips. The CP DRA comprises a circular DR, two pairs of driven L-like DR strips with different lengths, and a square ground-plane. To couple the electromagnetic energy to circular DR, an orthogonal cross-slot is used, and a stepped microstrip-line is also used to adjust the impedance matching. Influenced by the concept of deformed DR, two pairs of L-like DR strips of different lengths are inserted into the circular DR as part of the driven element to excite a new axial ratio (AR) resonant point. An antenna prototype is simulated, manufactured, and measured to validate the unique design. The measured results show that the designed antenna has broadband characteristic with a −10 dB IBW of 54% (1.91–3.32 GHz) and 3 dB ARBW of 42.1% (2.10–3.22 GHz).

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