Broadband Parametric Impedance Matching for Small Antennas Using the Bode-Fano Limit: Improving on Chu’s limit for loaded small antennas
In: IEEE Antennas and Propagation Magazine, Jg. 64 (2022-10-01), S. 55-68
Online
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Zugriff:
In this work, a parametric up-converter amplifier is introduced as a wideband impedance-matching network. Chu’s limit restricts the minimum Q-factor of unloaded small antennas. However, the practical bandwidth (BW) of small antennas is defined by their loaded Q-factor. By connecting a small antenna to an amplifier with a real input impedance that is several times greater than the radiation resistance of the antenna, we propose increasing the return loss, which leads to a reduction in the loaded Q-factor and an increase in the BW. In addition, a parametric amplifier is used because, in comparison with transistor amplifiers, it offers low-noise characteristics. The gain of the low-noise parametric amplifier compensates for the loss due to the imposed mismatch. Our simulation result shows BW improvements up to 32 times can be accomplished by trading 2 dB of noise figure (NF), compared to the 15 dB suggested by Chu’s limit for a lossy antenna. Accepted version
| Titel: |
Broadband Parametric Impedance Matching for Small Antennas Using the Bode-Fano Limit: Improving on Chu’s limit for loaded small antennas
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| Autor/in / Beteiligte Person: | Loghmannia, Pedram ; Manteghi, Majid |
| Link: | |
| Zeitschrift: | IEEE Antennas and Propagation Magazine, Jg. 64 (2022-10-01), S. 55-68 |
| Veröffentlichung: | Institute of Electrical and Electronics Engineers (IEEE), 2022 |
| Medientyp: | unknown |
| ISSN: | 1558-4143 (print) ; 1045-9243 (print) |
| DOI: | 10.1109/map.2021.3089997 |
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