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A new C-band monopole antenna is proposed for use in a CAPS-based vehicle monitoring system. This monopole antenna has highly omnidirectional main beam with low elevation angle and sufficient half-power beamwidth by using a cone-shaped ground plane. The impedance bandwidth defined by 10 dB return loss is 650 MHz (5.50–6.15 GHz), and the main beam elevation angle and halfpower beamwidth are about 20◦ and 44◦ at the operating frequency 5.885GHz, respectively. The manufactured prototype has survived a long-distance terrestrial test across China, and the design requirements for the satellite link budget, volume, cost, etc. have been reached.

A LOW ELEVATION ANGLE CONICAL BEAM ANTENNA FOR CAPS-BASED VEHICLE MONITORING SYSTEM