Ultra-Compact Highly Efficient Wideband Antenna Using Time-Varying Matching Network

The proposed efficient small loop antenna takes advantage of a novel antenna design concept of time-varying matching network that can be used to develop compact antennas with extremely wide bandwidths. The newly developed antenna has advantages of 1) At its lowest frequency of operation, a coupled sectorial loop antenna can be designed to have maximum dimensions of 0.1ë or smaller in range of 20-60 MHz; 2) Exhibit a 10X improvement in bandwidth of the transmitted or received signals compared to existing loop antennas of the same size; 3) Exhibit a 5-10X improvement of radiation efficiency compared to conventional existing loop antennas of the same size. The overall bandwidth–radiation efficiency product for the envisioned loop antennas will be improved by over 50-100X. An adaptive time-domain feeding scheme is utilized to improve the impedance matching of the antenna, which has the ability to store the incoming energy and release it back to the load in a way that ensures that a very high percent of the incoming energy is delivered to the load effectively, and hence improve the antenna efficiency without increasing its occupied area. The final result will be an ultra-compact low-profile antenna with ultra-broadband impedance bandwidth, highly efficiency, omni-directional radiation patterns across the frequency of operation, and moderate power handling capability.