Optically controlled reconfigurable band‐notched UWB antenna for cognitive radio systems

Cheng

Int J RF Microw Comput Aided Eng

et al. 2019

A miniaturized ultra‐wideband (UWB) monopole antenna with reconfigurable multiple‐band notched performance is demonstrated. By modifying the shape of the patch and the ground plane, the UWB operation is achieved. The first and second band‐notches are respectively generated by etching a rectangular slot with open ends and a U‐shaped slot in the patch, and the third band‐notch is produced by loading a C‐shaped parasitic element beneath the patch. To realize the reconfigurable band‐notched functions, four PIN diodes are inserted in three band‐rejected structures. The antenna has a compact dimension of 30 mm × 26 mm. It can switch between a UWB state and several band‐notch states by alternating the states of the diodes. Also, good radiation patterns are obtained.

Section: Resultsmentioning

confidence: 99%

“…In Reference , the tunable rejection band is realized through controlling the bias voltages of the varactor inserted in the rectangular strips and the U‐shaped parasitic element. Furthermore, UWB antennas with reconfigurable band‐notched performance are illustrated by using optically controlled microwave switch integrated in the slots …”

Section: Introductionmentioning

confidence: 99%

Reconfigurable ultra‐wideband monopole antenna with single‐, dual‐, and triple‐band notched functions

Cheng

Int J RF Microw Comput Aided Eng

et al. 2019

Micro & Optical Tech Letters

“…Table includes reconfigurable UWB printed antenna designs reported elsewhere . In the study, an antenna consisting of a circular slot and a radiating circular ring on the bottom was presented for blocking either a single or dual band of WLAN and C‐band by controlling three pin diodes.…”

Section: Review and Comparison With The Literaturementioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Toktaş

Yerlikaya

2018

A compact UWB G‐shaped printed monopole antenna with reconfigurable band‐notched characteristic is presented. The antenna design having a low profile of 8 × 27.5 mm2 consists of a G‐shaped radiating element size of 8 × 8 mm2 fed by a microstrip transmission line with a matching line and a defected ground structure. In order to achieve reconfigurable characteristic, a pin diode is inserted between the poles of G‐shaped radiator. When the pin diode is at ON‐state, G‐shaped patch behaves like a ring radiator and the antenna thus operates at whole UWB frequency. On the other hand; when the pin diode is at OFF‐state, the antenna has a band‐notched characteristic corresponds to C‐band and WIMAX band spectrum. The antenna design is parametrically investigated and the proposed design is verified by a prototype. From the measured results, the antenna has switchable characteristic between whole UWB spectrum of 2.8‐12.6 GHz at ON‐state and stopped band of 3.5‐4.95 GHz at OFF‐state. Therefore, the proposed antenna excels in terms of geometry's simplicity, compactness, near omnidirectional pattern, high efficiency as well as band‐notched configurability.

“…Owing to the mechanical devices, the dimension and cost will be increased. Furthermore, adopting electrical, optical [13,14], and mechanical methods as well as active elements by RF micro-electro-mechanical systems (MEMS). However, there are some related problems like the degradation of the switches on the antenna performance and the PIN diodes resistances, which require a large DC power.…”

Section: Introductionmentioning

confidence: 99%

Tunable Band-Notched CPW-Fed Uwb Monopole Antenna Using Capacitively Loaded Microstrip Resonator for Cognitive Radio Applications

Atallah¹,

Abdel‐Rahman²,

Yoshitomi³

et al. 2016

PIER C

Abstract-In this paper, a new compact coplanar waveguide (CPW) ultrawideband (UWB) antenna with an electronically tunable notched band is proposed for an overlay onto cognitive radio (CR) systems. The proposed antenna utilized a rectangular microstrip resonator in the bottom layer to create a single notched band and to realize tunability and miniaturization using varactors. The center frequency of the notched band can be electronically tuned by changing the effective electrical length of the microstrip resonator, which is achieved by employing two varactor diodes at the resonator edges. Moreover, the simple biasing of the varactor diodes has a small effect on the antenna performance. Experimental results show that the proposed antenna can selectively have a band notch over a continuous operating band about 1.44 GHz from 4.77 to 6.21 GHz to prevent the interference to the primary users that are operating in this band such as the WLAN (5.15-5.35 GHz; 5.725-5.825 GHz) and the WiMAX (5.25-5.825 GHz). Good agreement is found between the simulated and the measured data.