Title :
A circular waveguide antenna using high-impedance ground plane
Author :
Zhang, Guo-Hua ; Fu, Yun-Qi ; Zhu, Chang ; Yan, Dun-Bao ; Yuan, Nai-Chang
Author_Institution :
Inst. of Electron. Sci. & Eng., Nat. Univ. of Defense Technol., Changsha, China
fDate :
6/25/1905 12:00:00 AM
Abstract :
A high-impedance ground plane (HIGP) is used for a circular waveguide antenna. The benefits of using such a HIGP are related to the suppression of surface waves excited by the circular waveguide mouth, because the HIGP has a very obvious surface wave bandgap. Suppression or reduction of surface waves is expected to improve antenna efficiency and to bring a reduction of sidelobe level due to diffraction of the surface waves. In agreement with the expected result, the measured radiation patterns show that a 2 dB addition in the antenna gain and a 10 dB reduction in the back lobes, if the circular waveguide antenna working frequency is in the HIGP surface wave bandgap.
Keywords :
antenna accessories; antenna radiation patterns; circular waveguides; electric impedance; electromagnetic wave diffraction; photonic band gap; surface electromagnetic waves; waveguide antennas; circular waveguide antenna; high-impedance ground plane; photonic bandgap structures; radiation patterns; sidelobe level; surface wave bandgap; surface wave suppression; Antenna radiation patterns; Antennas and propagation; Electromagnetic waveguides; Frequency; Optical surface waves; Optical waveguides; Photonic band gap; Planar waveguides; Resonance; Surface waves;
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
DOI :
10.1109/LAWP.2003.814774
