DESIGN OF A RECONFIGURABLE MICROSTRIP FILTENNA USING π-SHAPED FILTER

Ramesh Boddu, K Phaninder Vinay, Arindam Deb, Jibendu Sekhar Roy

DOI Number
https://doi.org/10.2298/FUEE2504681B
First page
681
Last page
695

Abstract


In this paper, a novel proposal is presented for the design features of a compact reconfigurable circular patch antenna capable of switching between different frequency bands. The filtenna or filtering antenna comprises of a circular patch antenna offering ultra-wideband (UWB) performance and a π-shaped RF filter integrated with feed line to provide filtering functionality and reconfigurability. Additionally, three switches are incorporated into the filter at the intersections of the stubs with the feed line and at the connection point between the feed line and the patch antenna. When considering a system with three switches, there are a total of eight distinct various configurations of switch states. Each of these combinations is associated with unique frequency and pattern properties. The proposed antenna exhibits excellent compatibility with Wi-Max, Wireless LAN, and ultra-wide band applications, ensuring minimal disturbance from neighboring systems.  The circular patch antenna, featuring a circular shape, exhibits exceptional performance within the UWB frequency spectrum spanning from 2 GHz to 10 GHz, all the while operating without the inclusion of a filtering network. The π-shaped RF filter is designed to target specific frequencies: 4.27 GHz 3.51 GHz, 3.93 GHz, 5.185 GHz, and 2.93 GHz. The radiation characteristics further elucidate the substantial gain observed at the central frequencies that correspond to distinct switching states (ON and OFF). The proposed antennas have been successfully fabricated and subsequently subjected to meticulous measurements using network analyzer MS2037C. Based on careful observation, it is anticipated that there will be an excellent degree of agreement between the measured and simulated results.


Keywords

Reconfigurability, Filtenna, π-shaped RF filter, Ultra-Wide Band (UWB).

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References


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