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Broadband Parametric Impedance Matching for Small Antennas Using the Bode-Fano Limit: Improving on Chu’s limit for loaded small antennas
- Source :
- IEEE Antennas and Propagation Magazine. 64:55-68
- Publication Year :
- 2022
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2022.
-
Abstract
- 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
- Subjects :
- Physics
Noise measurement
business.industry
Impedance matching
Q-factor
Impedance
BANDWIDTH
Engineering, Electrical & Electronic
Fano plane
Condensed Matter Physics
0906 Electrical and Electronic Engineering
Engineering
Optics
Broadband
Telecommunications
Loaded antennas
1005 Communications Technologies
Antennas
Receiving antennas
Magnetic circuits
Limit (mathematics)
Electrical and Electronic Engineering
Networking & Telecommunications
business
Parametric statistics
Subjects
Details
- ISSN :
- 15584143 and 10459243
- Volume :
- 64
- Database :
- OpenAIRE
- Journal :
- IEEE Antennas and Propagation Magazine
- Accession number :
- edsair.doi.dedup.....e11b94ff817f32aa0920f4b73c70af51