An Active VHF and UHF Electrically Small Horn Antenna Using Non-Foster Matching Circuit

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Sohrabi A.; Dashti H.; Ahmadi Shoukoh J.

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Journal Paper

Paper Information

Journal: IRANIAN JOURNAL OF ELECTRICAL AND ELECTRONIC ENGINEERING Year:2023 | Volume:19 | Issue:4 Page(s): 1-11

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Information Journal Paper

Title

An Active VHF and UHF Electrically Small Horn Antenna Using Non-Foster Matching Circuit

Author(s)

Sohrabi A. | Dashti H. | Ahmadi Shoukoh J. | Issue Writer Certificate

Keywords

Non-foster

dual-ridged Horn Antenna

VHF

UHF

small antenna.

Abstract

In this article, an active electrically small Horn antenna for very high frequency (VHF) and ultra-high frequency (UHF) frequencies is presented. The proposed horn antenna has a height of 5 cm and a diameter of 4.28 cm which can cover 6-12 GHz without a special active circuit with the VSWR of less than 2. A Non-foster Active Adaptation Circuit is used to reduce the antenna input frequency from 164 MHz to 880 MHz. Good matching is visible between the simulation results and the measurement of the antenna reflection coefficient with the active matching circuit. The proposed structure has more than 137 % bandwidth. With the proposed active antenna, the problem of non-portability of VHF and UHF Horn antenna antennas has been solved. Finally, by analyzing the time domain, the stability of the circuit is examined, and the results of the stability test show that the system, including the antenna and the circuit, is stable. The antenna and the matching circuits are simulated by CST microwave studio and advanced design system, respectively.

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