A Miniaturized Tunable Blade Antenna for UHF Frequencies

This paper describes the concept and design of a novel miniaturized tunable blade antenna for UHF frequencies. The proposed antenna consists of two trapezoidal patches separated from each other at the feeding position. At the top trapezoidal patch, several horizontal slots are etched creates a miniaturized radiating structure. A series capacitor and a parallel inductor are also used at the antenna feed point. This matching network can tune the antenna resonance in about 100 MHz around the center resonant frequency of 300 MHz. The overall dimensions of the proposed antenna are 180 × 192 ×1.6 mm
³
, A prototype of the proposed antenna is fabricated and the simulated results are compared with the measured ones. The radiation results show that the antenna has 1 dBi gain at its resonance frequency with less than -15 dB cross polarization.