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A coaxial dual-feed annular microstrip patch antenna with a shorted ring is given in this paper. It has the characteristic of small permittivity, low-profile, high gain and circular polarization. This structure has a good adjustability, i.e. the size can be adjusted easily to operate on other frequency bands. The proposed antenna in this paper resonates at 2.25 GHz and the gain is higher than 11 dB...
The required performance of TTC (Tracking, Telemetry and Command) antennas for mini-satellite applications are briefly discussed and a new type of three-layered patch antenna is designed to meet the requirements. The antenna is constituted of two stacked annular ring radiators, the lower one of which is printed on a substrate with εr = 4.5 and directly fed by a coaxial probe, and the upper one is...
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