An ultrawideband unidirectional modified foursquare antenna |
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| Authors: | Zedong Wang Xianglong Liu Yingzeng Yin Jianjun Wu |
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| Affiliation: | National Laboratory of Science and Technology on Antennas and Microwaves, Xidian University, Xi'an, China |
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| Abstract: | This study introduces an ultrawideband unidirectional modified foursquare antenna. The antenna consists of two radiating loops and two truncated parasitic patches. A microstrip‐to‐stripline transition is used as a balun to feed the two radiating loops. A square cavity works as a reflector to realise a unidirectional radiation. This antenna has a total size of 0.56λL × 0.56λL × 0.15λL (λL: free space wavelength at lowest operating frequency). The measured results show that a broad operating bandwidth of 103.8% (2.67–8.44 GHz) for return loss being higher than 10 dB is achieved. Meanwhile, measured stable unidirectional radiation patterns with a gain (6.9–11.3 dBi) in +z direction, a front‐to‐back ratio better than 14.5 dB and low cross‐polarization level (
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| Keywords: | ultrawideband unidirectional radiation modified foursquare antenna |
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