Compact single-varactor diode frequency-reconfigurable microstrip patch antenna

Mahmoud Al Ahmad, Saifudeen Kabeer, Ala Abu Sanad, Lillian J.A. Olule

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


A single-varactor frequency-reconfigurable microstrip patch antenna is presented. The antenna comprises a symmetrical arrangement of four metallised patches coupled and interconnected via slots and metallic bars, respectively. The antenna structure is excited through a single feed probe connected to one of the patches. To achieve a compact size of 22 × 21 × 1.57 mm, a shorting pin is placed close to the feed point to pull down the antenna's resonant frequency. By adding a varactor diode at the centre of the patch, frequency reconfigurability is introduced. Variation in the varactor's DC reverse bias voltage from 0 to 7.5 V results in a corresponding resonant frequency shift from 1000 to 1150 MHz, thus providing a tuning range of 15%. The proposed design is compact and achieves frequency reconfiguration with a single-varactor diode and a low bias voltage requirement compared with the design characteristics reported in existing works. The antenna can find application in various existing and emerging communication systems.

Original languageEnglish
Pages (from-to)1100-1107
Number of pages8
JournalIET Microwaves, Antennas and Propagation
Issue number9
Publication statusPublished - Jul 29 2021

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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