Reconfigurable and Tunable S-Shaped Split-Ring Resonators and Application in Band-Notched UWB Antennas

Abstract

This paper proposes a compact reconfigurable (bandstop/bandpass) and frequency-tunable structure based on S-shaped split ring resonators (S-SRRs). It is known that an S-SRR coupled to a coplanar waveguide (CPW) provides a stopband in the transmission characteristic of the line. It is shown here that this behaviour of the S-SRR can be switched between fundamental resonance and second harmonic response by introduction of a PIN diode in the center segment of the S-SRR. Alternatively, if the S-SRR is loaded with a varactor diode instead of a switch, the frequency of the stopband can be continuously tuned from the S-SRRs fundamental resonance frequency to its second harmonic. Furthermore, it is shown that if a pair of shunt PIN diodes are introduced across the slots of the host CPW, the structure can be reconfigured from a bandstop to a bandpass structure. Thus, the proposed resonator structure can be used as the building block of reconfigurable (bandstop/bandpass) filters with tunable operating frequency. Finally, in order to demonstrate a practical application of the proposed structure, an ultrawideband antenna with a tunable band-notch is designed and experimentally validated.Index Terms-Reconfigurable antennas, S-shaped split ring resonator (S-SRR), ultrawideband antenna.

A compact reconfigurable ultra‐wideband G‐shaped printed antenna with band‐notched characteristic

“…Printed antennas have been lately become very popular due to their advantages such as low profile, light weight and versatile, and thus suitable for reconfigurability. Several reconfigurable band‐notched UWB printed designs have been proposed in the literature . An elaborate review and comparison is presented in Section 5, hereby they are concisely addressed.…”

Tunable Elliptical Split Ring Resonator Using Single Varactor Diode

“…There have been several studies on tunable or reconfigurable SRR by introducing two or more PIN diodes as switches or varactor diodes as a variable capacitors [10][11][12][13][14][15][16][17][18][19]. Using many PIN or varactor diodes complicates the manufacturing process by the need of DC biasing.…”

Uwb Heart-Shaped Planar Monopole Antenna With a Reconfigurable Notched Band

“…To reject these interferences, without increasing the system's size and complexity, a simple and effective way is to use UWB antennas with band-notched properties. For the past few years, various approaches have been investigated to design band-notched UWB antennas [7][8][9][10][11][12][13]. Generally speaking, there are two distinctive techniques used for achieving band-notched properties of planar antennas.…”

“…One general technique is to etch various shaped slots in the radiating patch or ground plane [7][8][9][10]. Another technique is to load parasitic resonators in or near the feed line [11,12]. However, these designs have a disadvantage that the notch frequency cannot be easily adjusted after fabrication.…”