Stacked arrangement of edge truncated elliptical and conventional circular patches for modern communication systems

Abstract

shunt inductance causes the LH branch in Figure 1 to be upshifted, resulting in the upshifted resonance frequency in Figure 7(b). It is observed that the radiation loss of the CRLH filter is improved by adding via holes and the bandwidth is increased from 5.7 to 8.2%. The insertion loss of the CRLH filter with additional via holes is measured to be 1.1 dB. CONCLUSIONSThe second-order CRLH-coupled line bandpass filter using the first negative mode is proposed. To design a CRLH bandpass filter, the design equations are derived. The even-mode and oddmode impedances of a CRLH-coupled line are calculated versus the width and separation of a coupled line section. The resonators of a filter are implemented by four unit-cells supporting the first negative mode and the size is reduced by 53%, compared with those of a conventional filter. An insertion loss of a CRLH filter is suppressed by adding via hole in the end of resonators. ACKNOWLEDGMENTSThis work was supported by the IT R&D programme of KEIT (Korea Evaluation Institute of Industrial Technology; 2009-F-033-01, Study of technologies for improving the RF spectrum characteristics by using the meta-electromagnetic structure.)ABSTRACT: The design and performance of a stacked arrangement of edge truncated elliptical patch and conventional circular patch antennas is proposed in this communication which is capable in providing improved impedance bandwidth with circularly polarized radiations. Both patches are designed on two independent glass epoxy FR-4 substrates separated by thin air gap. The two patches are placed one over other in such a way that their centers also lie one over other. The size of upper circular patch is marginally larger than lower edge truncated elliptical patch which is acting as driver patch. Proposed arrangement of patches yield measured impedance bandwidth as high as 0.94 GHz with measured axial ratio bandwidth close to 3.33%. The measured gain and axial ratio results of proposed arrangement on patches are compared with simulated results. Co and cross polar patterns suggest that radiations are right circularly polarized in nature. V C 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:947-952, 2011; View this article online at wileyonlinelibrary.com.Figure 13 (a) E plane E left and E right patterns of stacked antenna at frequency 2.93 GHz (b) H-plane E left and E right patterns of stacked antenna at frequency 2.93 GHz (c) E plane E left and E right patterns of stacked antenna at frequency 3.02 GHz (d) H-plane E left and E right patterns of stacked antenna at frequency 3.02 GHz. [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com]

Substrate integrated waveguide filter design with wave concept iterative procedure

“…Substrate integrated circuits (SICs) and substrate integrated waveguides (SIWs) in particular, find applications in modern microwave and millimeter wave engineering due to their capability of low cost realization of waveguide components as well as integration of different components within planar technology [1][2][3][4][5][6]. Design of broadband, low loss, and well-matched SIC transitions, such as microstrip-to-SIW and coplanar waveguideto-SIW is still ongoing topic of engineering research [1][2][3][4][5][6].…”

“…Design of broadband, low loss, and well-matched SIC transitions, such as microstrip-to-SIW and coplanar waveguideto-SIW is still ongoing topic of engineering research [1][2][3][4][5][6]. The adjustment of geometry parameters to satisfy given design speci-fications is one of the major tasks in SIC transition design.…”

Broadband circularly polarized gap‐coupled arrangement of rectangular patches for modern communication systems

“…Among the conventional microstrip antenna geometries, rectangular patch geometry is most widely analyzed geometry perhaps due to easy mathematical modeling and applicable boundary conditions [1, 2]. Extensive modifications in rectangular patch geometries have been reported in recent times to improve their bandwidth and gain [3–5] values. Circular polarization is an additional requirement for modern communication systems like GPS systems.…”