A Broadband Omnidirectional Circularly Polarized Antenna
Широкополосная всенаправленная антенна с круговой поляризацией
2013-01-03
SCID: 54.1/cr4vp7d5
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axial ratio bandwidth (41% for AR ≤ 3 dB)broadband rectangular loop elementsfeeding network with broadband baluns and impedance matchingflexible rolled dielectric substrateomnidirectional circularly polarized antenna
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Abstract (AI)
A broadband circularly polarized (CP) antenna is developed with an omnidirectional radiation pattern in the horizontal plane. Four broadband CP rectangular loop elements are employed for broadband omnidirectional CP radiation. The four rectangular loop elements are first printed on a flexible thin dielectric substrate and then rolled into a hollow cylinder. A conducting cylinder is introduced inside the hollow cylinder for achieving desired omnidirectional CP performance. A feeding network consisting of four broadband baluns and an impedance matching circuit is designed to feed the four rectangular loop elements. The omnidirectional CP antenna has a circular cross section with diameter of 0.38 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> . Experimental results show that the omnidirectional CP antenna has bandwidths of 41% (1.65-2.5 GHz) for axial ratio <; 3 dB and 45% (1.58-2.5 GHz) for return loss > 10 dB. The gain variation in the omnidirectional plane is less than 1 dB for the frequency range from 1.65 to 2.5 GHz. Good agreement is obtained between simulated and measured results.
Key Findings
1
A broadband circularly polarized antenna with omnidirectional horizontal-plane radiation is developed using four rectangular loop elements.
2
A feeding network of four broadband baluns and an impedance matching circuit successfully feeds the four loop elements for broadband operation.
3
Gain variation in the omnidirectional plane is less than 1 dB across 1.65–2.5 GHz.
4
Measured axial-ratio bandwidth is 41% (1.65–2.5 GHz) for AR ≤ 3 dB and measured return-loss bandwidth is 45% (1.58–2.5 GHz) for S11 > 10 dB.
5
Simulated and measured results show good agreement.
6
The four rectangular loop elements are printed on a flexible thin dielectric, rolled into a hollow cylinder, and paired with an internal conducting cylinder to achieve omnidirectional CP performance.
Research Object
Broadband omnidirectional circularly polarized antenna consisting of four rectangular loop elements printed on a flexible substrate, rolled into a hollow cylinder with an inner conducting cylinder and fed by four broadband baluns and matching circuit
Research Subject
Omnidirectional circularly polarized radiation performance across a broadband (axial ratio ≤3 dB bandwidth, return loss bandwidth, gain variation in the horizontal plane) for the cylindrical loop-element antenna
Publication Details
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2013-01-03
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