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Microwave Filters, Impedance-Matching Networks, and Coupling Structures
01 Feb 1980-
About: The article was published on 1980-02-01 and is currently open access. It has received 3929 citations till now. The article focuses on the topics: Waveguide filter & Impedance matching.
Citations
More filters
01 Jan 2018
TL;DR: In this paper, the core transmission line theory, starting with Maxwell's equations, is examined, and three microstrip-based band-pass filters are discussed, including a step-imperceptible low-pass filter.
Abstract: This chapter examines the core transmission line theory, starting with Maxwell’s equations, then progressing to TEM, TE, TM propagation modes, admittance [Y], impedance [Z], scattering [S] and ABCD matrices. The aim is to understand the properties of one type of transmission line, the microstrip, in minute detail, for example, the quasi-static solutions to Maxwell’s equations, variations of the basic structure (gap, step impedance, abrupt end, parallel pair combinations, etc.) drilling down to its filter properties and finally detailed analysis of three microstrip-based band pass filters. The chapter ends with a discussion of the stepped impedance low pass filter. Only the main results are highlighted with a short sketch of their derivation.
14 Jun 1993
TL;DR: In this paper, the authors present a CAD (computer-aided design) package for the design of microwave filters based on thick inductive windows in a rectangular waveguide and describe a step-by-step procedure that, based on the use of the code developed, makes it possible to select very accurately the initial geometry of the filter.
Abstract: Outlines the theory behind a CAD (computer-aided design) package for the design of microwave filters based on thick inductive windows in a rectangular waveguide. The authors describe a step-by-step procedure that, based on the use of the code developed, makes it possible to select very accurately the initial geometry of the filter. Finally, they give two filter design examples that demonstrate the effectiveness of the CAD procedure developed. The procedure described is essentially a true CAD technique that can completely replace all of the hardware work and all of the manual tunings in the laboratory that are traditionally required for the manufacture of this class of waveguide filters, thus resulting in a significant reduction in development time and cost. >
01 Oct 2019
TL;DR: In this paper, a new type of simple and inexpensive waveguide filter manufacturing that minimizes material consumption and has capabilities of high performance and rapid prototyping is presented, where filter inserts are fabricated by a combination of additive dielectric manufacturing and subtractive metal manufacturing, whereas standard waveguides are used as housings.
Abstract: A new type of simple and inexpensive waveguide filter manufacturing that minimizes material consumption and has capabilities of high performance and rapid prototyping is presented in this paper. Filter inserts are fabricated by a combination of additive dielectric manufacturing and subtractive metal manufacturing, whereas standard waveguides are used as housings, utilizing best properties of each technology. Along with it, a suitable filter design using metal rectangular rings has been developed. Since the rings that act as positive reactance discontinuities in the passband are resonant at frequencies below it, it is possible to bring lower stopband transmission zeros near the passband to create sharp skirt. A resonator of such a filter and a third order bandpass filter sample have been designed at 11.13 GHz and 11.36 GHz centre frequencies respectively. In addition, by reducing size of rectangular rings in the waveguide, upper stopband transmission zeros can be realized, while the rings act as negative reactance discontinuities in the passband. This was utilized in a fourth order bandpass filter with 9.62 GHz centre frequency to have finite transmission zeros in both stopbands. All the filtering structures have been fabricated with 3D printer to extrude polylactic acid and circuit board plotter to mill copper sheet. Excellent measurement results that have been obtained validate the proposed design. Practical sides of achieving quality 3D printouts are analysed.
TL;DR: In this article, a simple method and structure to design a dual-band fllter by using 4 stepped impedance resonators (SIRs) is presented, which has enhanced performance, including good rollofi in the stopband and good insertion-loss response.
Abstract: A simple method and structure to design a dual-band fllter by using ‚=4 stepped impedance resonators (SIRs) is presented in this paper. This fllter has enhanced performance, including a good rollofi in the stopband and good insertion-loss response. The structure is compact and easy to fabricate. The circuit is investigated with the even-odd mode theory to prove the existence of transmission zeros. The dual-band response is analyzed by using SIR theory and the parallel-coupled line theory. Based on the proposed fllter topology, two dual-band fllters center operating frequency at 2.4GHz and 5.2GHz respectively with difierent conflgurations have been designed and one of them was tested, which validates the diversity of the fllter conflguration. Experimental results show that the measured and simulated performances are in good agreement. The overall area of the fabricated fllter is 12mm ⁄ 12mm.