An investigation of wideband circular cylindrical sector dielectric resonator antenna with microstripline feed

Abstract

Input the interference curve to computer by data acquiring system, and the local maximum values in one period of an interference curve can be measured. Substitute the values to Eq. (9), and then there can be n (n is an odd number) or n þ 1 (n is an even number) linear equations. Because Eq. (9) is an even function, so nearly half equations are repeated. Forsake the repeated equations, we can get an equation system.ABSTRACT: The article proposes a compact microstrip line fed dielectric resonator antenna with half split circular, cylindrical profile which is experimentally investigated. It shows that at optimum parameters, this low profile, small size antenna gives a wideband Figure 5 Experiment interference curve and compensated curve. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com]ABSTRACT: A new eigenmode algorithm based on the method of lines and the generalized transmission line equations is applied on full-wave analysis of (3-D) MMIC components. The analytical calculation in the direction of propagation enables the analysis of structures of very short or long interconnections between single discontinuities. The analysis is developed by nonequidistant discretization to reduce the discretization window. In this article, a periodically nonuniform coupled microstrip lines filter is designed to offer a wide band performance with a small size structure and with harmonic suppression. The analysis of this filter is applied using the new technique of the method of lines. In this analysis, the scattering parameters of the designed filter are computed. The designed filter is fabricated and tested, where good agreement is found between the numerical and the experimental results.

Recent developments in bandwidth improvement of dielectric resonator antennas

“…Broadly, these approaches can be divided into four categories; firstly, according to the antenna geometry (DR shape/fractal/EBG/metamaterial), secondly, the coupling mechanism (feeding type/aperture shape), thirdly, the DR permittivity, and lastly, according to the excitation of specific mode. From ease of readers' point of view, these techniques are discussed separately for single‐band, dual‐band, and multi‐band,, respectively. Moreover, some other characteristics say radiation/notch…”

“…Next to DRA shape, the coupling mechanism plays an important role in controlling performance characteristics of DRA. This technique is also known as bandwidth improvement by means of impedance matching and this can be established either by modification in feeding line or slot types …”

“…Hence, instead of traditional feeding line, some advanced types say, aperture, parasitic strip, L‐shaped probe, elliptical patch, trapezoid patch, bevel shape patch, have been proposed in literature as shown in Figure . The complete literature is discussed here.…”

“…Ge and Esselle, have found a S 11 < −10 dB return loss over 3.1 to 10.7 GHz while a coaxial probe was used a feed. Gopakumar et al have investigated a half split circular, cylindrical profile DR antenna fed by a microstrip feed line offering 36.7% impedance bandwidth. A compact circular shaped‐DR coupled by a crescent patch and CPW feed line has been designed for achieving UW band over 1.6 to 15 GHz by Weng et al Thame and Wu have designed coaxial probe fed Bowtie shaped DRA for 49% bandwidth.…”

Modified cylindrical dielectric resonators excited with loaded fork monopole antenna

“…A major fraction of the recent studies concentrates on enhancing the impedance bandwidth of the DRA in view of different applications. For this purpose, various techniques have been explored, which include a removed air‐volume from a cylindrical dielectric resonator (CDR) [1], vertical strip with half‐split cylindrical resonator [2], stacked rectangular dielectric [3], U‐shaped dielectric resonator with conformal triangular patch [4], using a slot‐coupled cylindrical DRA with the dual‐mode capability [5], exciting two radiation modes in a coaxial‐fed DRA [6], applying three different methods of impedance matching, dielectric and ground plane shaping procedures in a hybrid monopole DRA [7], and using a rectangular dielectric resonator and a bevel‐shaped patch excitation together with an air‐gap inserting technique in Ref. 8.…”