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The ultrawideband (UWB) planar antenna is designed as a circular metallic patch fed by a coplanar waveguide (CPW). This antenna provides the impedance bandwidth of the wideband response from 2.5 to 12 GHz. To achieve the notched characteristics at desirable frequencies, the electric ring resonator (ERR) incorporated into the CPW feedline is proposed for use in the planar configuration of the UWB antenna...
The ultra-wideband (UWB) monopole antenna is designed as the circular patch fed by a coplanar waveguide (CPW). To achieve the notched characteristics at desired frequencies, the electric ring resonator (ERR) incorporated into the CPW feed line is used. The notched frequency band is controlled by dimensions of the ERR structure. The single-notched band is obtained by placing a single-mode ERR beneath...
In this paper, we investigated the radiation properties of novel planar monopole antenna with half-circular perturbations for ultra wideband (UWB) application. The proposed antenna, designed on low cost substrate material FR4, consists of a simple rectangular radiating patch with two half-circular cuts and a partial ground plane with a number of half-circular protuberances and cuts. The antenna is...
In this paper, novel ultra-wideband flexible step-impedance spiral antenna (SIA) is proposed. Proposed antenna has VSWR<2 frequency range between 10.5 GHz and 57 GHz. In comparison with conventional an Archimedean spiral antenna with constant line width, proposed antenna has an excellent impedance matching, better directivity and radiation efficiency in the entire operating range.
In this work, a stepped-impedance stub-loaded resonator which exhibits tri-mode behaviour is presented. The proposed resonator is analyzed in detail and used to design a compact tri-band bandpass filter which operates at 1.8/3.5/5.2 GHz. The fabricated filter exhibits good selectivity, good transmission and return-loss characteristics, and a compact size of only 0.21λg × 0.11λg, where λg denotes the...
In this paper, a quasi-static model for the microstrip monopole antenna is presented. The electrical model is proposed and the procedure for calculation of circuit parameters is explained in details. The proposed model was realized using the Schematic simulator from Microwave Office, and validated by a good comparison to full-wave EM simulation performed in CST Microwave Studio.
This paper presents a novel approach which can be used to design compact Ultra-Wideband (UWB) filters with high selectivity and excellent stopband performance. The design is based on a new 4-pole wideband filter circuit that provides transmission zeros to enhance the selectivity. In addition, the proposed design can be easily implemented on multilayer substrates with simple and low-cost manufacturing...
An all-pass constant-phase 2-port network that contains negative capacitances and behaves as a perfectly matched phased inverter in an almost unlimited frequency range is proposed. The unique network properties are explained using the even-odd mode analysis technique as well as in terms of immittance inverters. Different aspects of practical implementation of the network with the negative capacitances...
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