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A Four-arm Circularly Polarized High-gain High-tilt Beam Curl Antenna for Beam Steering Applications / Hengyi Zhou; Arpan Pal; Amit Mehta; Dariush Mirshekar; Hisamatsu Nakano
IEEE Antennas and Wireless Propagation Letters, Volume: 17, Issue: 6, Pages: 1034 - 1038
Swansea University Author: Mehta, Amit
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A novel circularly polarized beam steering four-arm curl antenna with four feed points is presented. The antenna provides steerable high-gain high-tilt right-handed circularly polarized (RHCP) beams for satellite communications. The antenna operates over a test frequency band of 1500 MHz to 1670 MHz...
|Published in:||IEEE Antennas and Wireless Propagation Letters|
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A novel circularly polarized beam steering four-arm curl antenna with four feed points is presented. The antenna provides steerable high-gain high-tilt right-handed circularly polarized (RHCP) beams for satellite communications. The antenna operates over a test frequency band of 1500 MHz to 1670 MHz and covers the entire L1 band. The four arms are arranged symmetrically with respect to the center of the antenna and each arm is fed by a coaxial line. When one of the four feed points is excited and the remaining feed points either open-circuited or terminated to 50° impedance, the antenna generates an RHCP tilted beam of 49° in the elevation plane. At a test frequency of 1575 MHz, the antenna provides a gain of 8.12 dBic. The antenna can switch the tilted beam in the four different space quadrants in the azimuth plane by exciting one feed point at a time. It is found that over the test band, the antenna provides a total efficiency of more than 89% and a gain of greater than 8 dBic.
September_2018_100 words: This paper (in best antennas letters) is a result of a full year’s hard work by the PI team in Swansea and his Japanese collaborator to solve a challenging problem for Inmarsat BGAN (Broadband Global Area Network radio module). For the first time, it shows, a 50-degrees bended circularly polarized beam for high throughput satellite communications on narrow-band spectrum. This is significant as the other current alternative offer 5 dB lesser signal for Inmarsat BGAN satellite, which in effect means 5 times lesser internet speeds. This design is now selected as the main satellite antenna module for going forward for an ESA research project.
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