A Low-Profile Bi-Directional Cavity Antenna with Broadband Impedance Characteristics(Special Issue on Innovation in Antennas and Propagation for Expanding Radio Systems)

概要

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A low-profile bi-directional cavity antenna has been developed for the IMT-2000 indoor base stations. The geometrical relationships required for the design of an antenna with broadband impedance characteristics, which are obtained as a superposition of two resonant modes (M-antenna + metal case), are presented. The approximate equations describing the resonant frequencies associated with the two resonant modes are derived. By using the equations, a cavity antenna with dimensions of 120 mm × 120 mm × 12 mm and a fractional bandwidth of 18.3% (VSWR<2) that meets the IMT-2000 specification can be designed successfully. The proposed design procedure of the antenna is confirmed by the measurements.
社団法人電子情報通信学会の論文
2001-09-01