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In this paper, we evaluate adaptive impedance tuning in combination with intrinsically unmatched antennas in order to reduce the form factor of handset antennas. Thereby, we are able to shrink the size of an antenna element by a factor of four compared to an intrinsically broadband matched antenna while maintaining a similar total efficiency in usage scenarios. The antenna concept is based on an unmatched...
Passive electrically small antennas have a small radiation resistance and a narrow bandwidth. In this paper, a new type of active antenna is reported in which an active circuit generating a non-Foster impedance is embedded in a metamaterial-inspired small antenna with an inherent sizable radiation resistance. This circuit interacts with the reactive elements of the antenna. The end result is a compact,...
When the size of an antenna is electrically small, the antenna is neither efficient nor a good radiator because most of the input power is stored in the reactive near-field region and little power is radiated in the far-field region. As demonstrated in [1][2], the radiation quality factor of small antennas is definitely high. In other words, the input impedance of small antennas is considerably reactive...
The purpose of this study is to provide a miniaturized volumetric folded dipole antenna with ideal electrical and mechanical characteristics such as broadbandness, good impedance matching, compactness (light weight, small sized, cheap), and rigidness; compared to other competitors such as biconical antennas and others. Our proposed antenna is competent at low frequencies especially in the HF range...
In this paper, we present a time-varying matching design for electrically small antennas in pulse-based systems. The proposed technique is applied to small loop antennas in the receiving mode. Simulated results show that substantial improvement in the overall antenna efficiency can be achieved without dispersion that is one of the major limitations of a conventional matching network of equivalent...
A high intercept points, cost-effective, and power-efficient switching FET double balanced mixer (DBM) is reported. The Switching FET DBM demonstrated in this work offers input intercept points (IIP3) and conversion loss typically 44 dBm and 8.5 dB respectively with 15 dBm LO power for the frequency band (RF: 900-2150 MHz, LO: 850-1950 MHz, IF: 50-200 MHz). The measured interport isolation is typically...
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