volume | PIER Journals

Abstract

This paper introduces a novel, compact, frequency-reconfigurable multiple-input multiple-output (MIMO) filtenna that integrates a defected microstrip structure (DMS)-based bandpass filter (BPF) with a wideband circular patch antenna to support dynamic tuning across sub-6 GHz and X-band applications. The antenna operates efficiently as a wideband system while enabling mechanically controlled narrowband filtering through a reconfigurable BPF structure embedded in the feedline. Tunability is achieved using discrete switching mechanisms, allowing frequency selection from 5.9 GHz up to 12 GHz, with a peak gain of 6 dBi and high radiation efficiency. A two-port MIMO configuration with orthogonal element placement and an embedded decoupling structure ensures superior isolation (< –48 dB), extremely low envelope correlation coefficient (ECC < 0.0035), and diversity gain (DG) approaching 9.998 dB. The proposed antenna demonstrates excellent performance metrics with a compact footprint of 80 × 45 mm², making it well-suited for compact wireless applications in environments with limited spectral availability.

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Dr. Amany A. Megahed

Dr. Rania Hamdy Elabd

Professor Ahmed Jamal Abdullah Al-Gburi

Dr. Marwa E. Mousa