Abstract
An active reconfigurable ultra-wideband antenna exhibiting complementary frequency notched and narrowband responses is proposed in this paper. The frequency responses are achieved on a CPW fed single element printed monopole antenna loaded with a pair of split ring resonators (SRR) and PIN Diodes. The SRRs and PIN Diodes embedded on the Coplanar Waveguide (CPW) feed works as an inline filter, when activated, exhibits frequency reconfigurability by transforming a frequency notched wideband antenna into a narrowband antenna. Different biasing conditions (reverse and forward) on the loaded PIN diodes toggle between frequency-notched and narrow band response of the antenna. Prototypes are fabricated and the measured impedance and radiation characteristics are presented. This concept offers multi-antenna functionality using a single radiator without any modification or addition to the radiator geometry.
Highlights
Modern RF systems employ transceivers which comprise multiple antennas for different functions and applications
A pair of split ring resonators (SRR) and PIN diode loaded in the Coplanar Waveguide (CPW) feed line constitute a dual state filter section, exhibiting frequencynotched/narrow band-pass response depending on the status (ON/OFF) of the PIN diode
The variation between simulation and measurement post-resonance is due to the ohmic loss arising from the finite impedance of the PIN diodes in their OFF state
Summary
Modern RF systems employ transceivers which comprise multiple antennas for different functions and applications. A recent paper showing a compact broadband reconfigurable frequency tunable structure using single ring rectangular shaped SRRs coupled to a CPW line provides a stop-band in the transmission characteristic of the line [9]. A pair of SRRs and PIN diode loaded in the CPW feed line constitute a dual state filter section, exhibiting frequencynotched/narrow band-pass response depending on the status (ON/OFF) of the PIN diode. This filter section can be integrated in the feed-section of any CPW fed antenna. A single printed monopole antenna loaded with SRRs and PIN diodes on the feed section provides the dual functionality.
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