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Liquid Metal Bandwidth-Reconfigurable Antenna

Alqurashi, Khaled, Kelly, James R., Wang, Zhengpeng, Crean, Carol, Mittra, Raj, Khalily, Mohsen and Gao, Yue (2020) Liquid Metal Bandwidth-Reconfigurable Antenna IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, 19 (1). pp. 218-222.

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This letter shows how slugs of liquid metal can be used to connect/disconnect large areas of metalization and achieve a radiation performance not possible by using conventional switches. The proposed antenna can switch its operating bandwidth between ultrawideband and narrowband by connecting/disconnecting the ground plane for the feedline from that of the radiator. This could be achieved by using conventional semiconductor switches. However, such switches provide point-like contacts. Consequently, there are gaps in electrical contact between the switches. Surface currents, flowing around these gaps, lead to significant back radiation. In this letter, the slugs of a liquid metal are used to completely fill the gaps. This significantly reduces the back radiation, increases the bore-sight gain, and produces a pattern identical to that of a conventional microstrip patch antenna. Specifically, the realized gain and total efficiency are increased by 2 dBi and 24%, respectively. The antenna has potential applications in wireless systems employing cognitive radio (CR) and spectrum aggregation.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
Kelly, James R.
Wang, Zhengpeng
Mittra, Raj
Date : 20 January 2020
OA Location :
Copyright Disclaimer : © 2019 IEEE
Uncontrolled Keywords : Bandwidth reconfiguration, cognitive radio (CR), liquid metal, microstrip antenna,monopole antenna,reconfigurable antennas,spectrum aggregation, ultrawideband (UWB) antennas
Depositing User : James Marshall
Date Deposited : 04 Feb 2020 14:46
Last Modified : 04 Feb 2020 14:46

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