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In this paper, novel multilayer microstrip diplexer is presented for ISM band at 2.45 GHz and WiFi at 3.6 GHz. The receiver and transmitter filters of the diplexer are implemented using square loop dual-mode resonators. First, we propose the planar diplexer realized in one single PCB layer. In that way, the characteristic in both bands can be independently controlled by changing the resonator dimensions...
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 frequency selective surfaces (FSS) with ultra-wideband (UWB) absorption are proposed, as well as a simple circuit model which can be used for their design. Multi-layered unit cell is realized using square ring resonators and various parameters and their effect on the FSS transmission performances have been analysed. In order to demonstrate the applicability of the proposed unit...
In this paper, a compact multilayer dual-band and tri-band filters based on grounded spiral resonators are proposed. The filters are realized on two stacked substrates: Taconic CeR-10 substrate and Kapton foil, where the feeds are positioned in the upper layer whereas resonators are placed in the middle layer between feed lines and the ground. The proposed dual-band filter operates at 0.68/0.82 GHz...
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 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.
In this work, a very compact dual-band filter based on folded quarter-wavelength resonators is proposed. Specific configuration of the filter results in four independently controlled transmission zeros which provide very high selectivity of the passbands. The proposed configuration is analysed in detail and a design procedure is presented. To demonstrate the feasibility of the proposed approach, two...
In this paper, a new compact bandpass microstrip filter based on grounded patch resonators is proposed. The coupling model of the filter is established and the coupling coefficients of coupled pair of resonators and the external quality factors of basic feeding configuration are investigated using full-wave electromagnetic simulations. As an example, a third order direct-coupled Chebyshev filter that...
In this paper, a new cross-coupled microstrip filter based on the grounded patch resonators is designed, fabricated and measured. Coupling characteristics of three basic coupling structures encountered in this class of filters are investigated using full-wave electromagnetic simulations, and the design curves for coupling coefficients and the external quality factor are presented. As the demonstration,...
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