Planar Ultrawideband Antenna with Photonically Controlled Notched Bands

Abstract

A design of a planar microstrip-fed ultrawideband (UWB) printed circular monopole antenna with optically controlled notched bands is presented. The proposed antenna is composed of a circular ultrawideband patch, with an etched T-shaped slot controlled by an integrated silicon switch. The slot modifies the frequency response of the antenna suppressing 3.5–5 GHz band when the switch is in open state. The optical switch is controlled by a low-power near-infrared (808 nm) laser diode, which causes the change in the frequency response of the antenna generating a frequency notch. This solution could be expanded to include several notches in the antenna frequency response achieving a fully reconfigurable UWB antenna. The antenna could be remotely controlled at large distances using optical fiber. The prototype antenna has been fully characterized to verify these design concepts.

A planar CPW fed UWB antenna with dual rectangular notch band characteristics incorporating U‐slot, SRRs , and EBGs

“…Multiple design techniques have been provided in the literature for achieving band‐notch characteristics in the UWB antennas, that is, slot and parasiticelementloading, 10,11 using fractals, 12 embedding split‐ring resonators (SRRs) and electromagnetic bandgap (EBG) structures 1,3,13‐17 . Further, Varactor diodes, PIN diodes, variable capacitors, optically controlled switch, magnetodielectric materials and micro‐electro‐mechanical systems (MEMS) have been also used to achieve reconfigurable operation in UWB antennas with band‐notch characteristics 3,18‐23 …”

“…1,3,[13][14][15][16][17] Further, Varactor diodes, PIN diodes, variable capacitors, optically controlled switch, magnetodielectric materials and microelectro-mechanical systems (MEMS) have been also used to achieve reconfigurable operation in UWB antennas with band-notch characteristics. 3,[18][19][20][21][22][23] The aforementioned designs have a common drawback that has not been assessed meticulously, that is, all these designs have a spiculate curve for notch band…”