Ayman Ayd R. Saad

A Proximity-Fed Annular Slot Antenna with Different a Band-Notch Manipulations for Ultra-Wide Band Applications

A proximity-fed annular slot antenna for UWB applica- tions with a band rejection using difierent techniques is presented. The proposed antenna provides an UWB performance in the frequency range of … 2:84 to … 8:2GHz with relatively stable radiation parame- ters. Three difierent techniques to construct a resonant circuit for the proposed antenna are investigated to achieve the band-notch property in the band … 5:11 to … 5:69GHz band which include the WLAN and HIPERLAN/2 services without degrading the UWB performance of the antenna. Three resonators are considered; a single complementary split ring resonator (CSRR), a complementary spiral loop resonator (CSLR) and a spurline slot. Furthermore, the band-notched resonance frequency and the bandwidth can be easily controlled by adjusting the dimensions of the resonator. The proposed antenna is simulated, fab- ricated and measured. The measured data show very good agreements with the simulated results. The proposed antenna provides almost om- nidirectional patterns, relatively ∞at gain and high radiation e-ciency over the entire UWB frequency excluding the rejected band.

A Design of Miniaturized Ultra–Wideband Printed Slot Antenna with 3.5/5.5 GHz Dual Band–Notched Characteristics: Analysis and Implementation

A design and analysis of a novel proximity-fed printed slot antenna with 3.5/5.5GHz dual band-notched characteristics are presented. To obtain an ultra-wideband (UWB) response, a circular patch with a rectangular conjunction arm is etched concentrically inside a ground plane aperture. The antenna is proximity-fed by a microstrip line with an open shunt stub on the other side of the substrate. The designed antenna satisfles a i10dB return loss requirement in the frequency band from 2.7 to 17GHz. In order to obtain dual band-notched properties at 3.5 and 5.5GHz, an open ring slot is etched ofi the circular patch and a …-shaped slot is etched ofi the microstrip feeding line, respectively. A curve fltting formulation is obtained to describe the in∞uences of the notched resonators on the corresponding notched frequencies. The proposed antenna is designed, simulated and fabricated. The measured data show a good agreement with the simulated results and the equivalent circuit results through the use of a modifled Vector Fitting technique for a rational function approximation. The proposed antenna provides almost omnidirectional radiation patterns, relatively ∞at gain and high radiation e-ciency over the entire UWB frequency excluding the two rejected bands.

An integrated 3G/Bluetooth and UWB antenna with a band-notched feature

In this article, the design and analysis of a compact slot antenna that covers 3G, Bluetooth, and the UWB bands with the standard band-notched function at 3.6 GHz are presented and investigated. A rectangular wide-slot etched off the ground plane is used to control the low operating frequency band and the impedance matching of the proposed antenna. A manipulated rectangular tuning stub is used to enhance and control the operating bandwidth at the high frequency band. The proposed antenna is fabricated and is successfully simulated and measured. The results indicate that the proposed antenna yields an impedance bandwidth of about 7.75 GHz (from 1.9 to 9.65 GHz) defined by VSWR ≤ 2 for UMTS (1.920–2.170 GHz)/Bluetooth (2.4–2.484 GHz)/3GPP (2.57–2.62 GHz), and UWB (3.1–9.65 GHz) applications with good radiation characteristics. To reduce interference between the UWB system and the WiMAX system (3.3–3.9 GHz), a U-shaped slot is employed in the microstrip feeding line to create notched band of 3.2–4.0 GHz. Furthermore, a mathematical circuit model compatible with time-domain circuit simulators, which is based on a vector fitting technique, is also illustrated to investigate the proposed antenna characteristics.