Analysis of CPW-Fed Uwb Antenna for Wimax and Wlan Band Rejection

Abstract

A compact ultra wide band (UWB) antenna with dual band notch characteristics is proposed. The antenna consists of a coplanar waveguide (CPW) fed bevelled rectangular patch and a modified rectangular ground plane. A Z-shaped meander line parasitic element and a pair of symmetrical L-shaped quarter-wavelength stubs are employed to realise band-notched functions at WiMAX and WLAN bands respectively. By optimizing the dimensions and positions of these notch structures, the desired notch-bands of WLAN and WiMAX are achieved. Unlike other dual band-notched antennas reported in literature this antenna has a merit of regulating the centre frequency as well as the bandwidth of both the notched bands easily and independently. The measured −10 dB S 11 covers the bandwidth from 2.5 to 11.5 GHz, with two notched bands from 3.3 to 3.6 GHz and 5.2 to 5.75 GHz. The proposed antenna exhibits nearly omni-directional radiation patterns with moderate gain and small group delay variations less than 0.5 ns over the entire operating bandwidth except at the notched bands. Moreover, by using antenna transfer function, the time domain characteristic of the antenna is also studied to confirm its suitability for UWB pulse communication.

Design of compact UWB monopole planar antenna with modified partial ground plane

“…We present the results of a study on the effects of slot shapes on the performance of an UWB antenna, regarding impedance bandwidth, radiation pattern, and gain. The proposed antenna has been achieved wider bandwidth compared to the design . The intended radiator is simple in design, successfully implemented, easy fabrication, and experimentally verified with results.…”

“…It varies from 3.1 to 10.6 GHz allowed by US (FCC) (Federal Communications Commission) in February 2002. Various ultra‐wide band planar radiators of different configurations have been considered . In Ref.…”

“… has hybrid geometry using half circular ring and half square ring. The antenna with coplanar waveguide (CPW)‐fed beveled rectangular patch and a modified rectangular ground plane is analyzed for UWB application . The authors demonstrated an arc‐shaped slot into a standard, compact elliptical patch‐based monopole UWB antenna .…”

“…, it is demonstrated that slotted ground microstrip antenna with frequency selective surface reflector (FSS) for UWB application. But all the above antennas have complex geometry and large size.…”

Very Small Dual Band-Notched Rectangular Slot Antenna With Enhanced Impedance Bandwidth

“…One general technique is to apply various shaped slots on the radiating patch and ground plane [16][17][18][19][20][21]. Other main methods employ parasitic strips [22][23][24][25][26] and hybrid methods that apply a combination of the mentioned techniques [27].…”