Showing papers on "Waveguide filter published in 1980"
Book•
01 Feb 1980
3,929 citations
TL;DR: In this paper, approximate design formulas for bandpass filters using parallel coupled stripling stepped impedance resonators (SIR) are derived, taking into account the arbitrary coupling length as well as quarter-wavelength coupling.
Abstract: Approximate design formulas for bandpass filters using parallel coupled stripling stepped impedance resonators (SIR) are derived. The formulas take into account the arbitrary coupling length as well as quarter-wavelength coupling. Some advantages of this filter are its abilities to control spurious response and insertion loss by changing the structure of the resonator. Using the design formulas two experimental filters were designed and fabricated and their performances closely matched design data.
784 citations
TL;DR: In this article, the authors considered the problem of an infinite rectangular waveguide periodically loaded by means of infinitely thin resonant irises and proposed a method of solution that breaks down the problem into two separate steps: 1) the multiport network characterizstion of the resonant IR and 2) the network analysis of the equivalent periodic network.
Abstract: In this contribution we treat the problem of an infinite rectangular waveguide periodically loaded by means of infinitely thin resonant irises. The method of solution breaks down the problem into two separate steps: 1) the multiport network characterizstion of the resonant iris; 2) the network analysis of the equivalent periodic network. The results for the resonant iris can be used for various applications, such as the design of waveguide filters and matching networks. In the limiting cases of purely capacitive or inductive irises, the results agree exactly with existing experimental and numerical values. The size of the eigenvalue equation to be solved for the periodic structure equals half the number of ports of the network chracterization of the iris and is generally small (typically five to seven). The eigenvalues have good convergence properties with resect to the size of the matrix.
36 citations
TL;DR: In this paper, the authors presented both TE01p mode resonant frequency perturbation by a tuning screw and a two modes dielectric filter using two perpendicularly polarised HE111 modes of the resonator.
Abstract: In a shielded cylindrical dielectric resonator a number of degenerate modes with identical natural frequencies can be found. These degenerate modes can be coupled together to form coupled circuits by perturbating the geometrical configuration of the structure. The letter presents both TE01p mode resonant frequency perturbation by a tuning screw and a two modes dielectric filter using two perpendicularly polarised HE111 modes of the resonator.
19 citations
TL;DR: In this article, a new type of wide field-of-view filter is proposed and analyzed, which consists of a multilayer stack of two dielectric media such that the dispersion curves of these two media intersect at a particular wavelength.
17 citations
Patent•
19 Sep 1980TL;DR: In this article, the authors presented a bandstop and bandpass filter with broad and narrow wall resonator coupling in a rectangular waveguide at a common cross sectional reference plane, where each tone rejection is provided by a pair of resonators coupling to the electromagnetic field signal at two points one from a broad wall and the other from a narrow wall of the waveguide but displaced by some multiple of a half wavelength.
Abstract: Bandstop (FIGS. 1-3) and bandpass (FIGS. 4, 5) filters are presented utilizing broad and narrow wall resonator coupling in a rectangular waveguide (11 and 37) at a common cross sectional reference plane. For the bandstop filter, the resonators (12, 13) are resonant at a common frequency f 0 to provide a two-pole bandstop response in a filter of minimal longitudinal dimensions. For the compact bandpass filter, each tone rejection is provided by a pair of resonators (31, 35) coupling to the electromagnetic field signal at two points one from a broad wall and the other from a narrow wall of the waveguide (37) but displaced by some multiple of a half wavelength. Another pair of resonators (33, 34) are in common cross sectional plane relationship to the first pair but located on a wall of different width to provide rejection of a tone at the other end of the passband. The use of resonators with different resonant frequencies at a common cross sectional plane avoids possible interresonator coupling. Additional pairs of resonators (e.g., 32, 36) may be interleaved with these resonator locations. Each resonator (e.g., 13) is associated with an aperture (e.g., 19) and has its major portion extending into a housing (e.g., 18) located exterior to the waveguide (e.g., 11).
7 citations
TL;DR: The miniaturized channel filter with dielectric materials used for UHF television translator equipment in future is reported.
Abstract: There are a lot of UHF television translator in Japan, and the equipment itself has been made small by using the recent solid state technology. Our paper reports the miniaturized channel filter with dielectric materials used for UHF television translator equipment in future.
5 citations
TL;DR: An analysis of high selectivity TE/sub 10/-mode filters with quarter-wavelength coupled resonators formed by axially spaced dielectric plates is presented and shows that high-loaded quality factors of individual resonators can be obtained by placing the resonant frequency close to the waveguide cutoff frequency and by using low-loss Iow-dielectric constant materials.
Abstract: An analysis of high selectivity TE/sub 10/-mode filters with quarter-wavelength coupled resonators formed by axially spaced dielectric plates is presented and shows that high-loaded quality factors of individual resonators can be obtained by placing the resonant frequency close to the waveguide cutoff frequency and by using low-loss Iow-dielectric constant materials. Design equations for Butterworth and Chebyschev filters are presented and employed in a three-cavity Butterworth filter having 30-MHz bandwidth at resonant frequency at 7250 MHz. Experimental results show that filter performance can be well predicted.
4 citations
28 May 1980
TL;DR: In this paper, two microstrip variable band-pass filters for 6 GHz and 4 GHz bands are proposed and tested and the pass-band width varies from 310 MHz to 1.24 GHz for the varactor-diode coupled filter, and it varies from 380 MHz to 2.18 GHz for a filter which is composed of low-pass and highpass filters connected in series.
Abstract: Two microstrip variable band-pass filters for 6 GHz and 4 GHz bands are proposed and tested. The pass-band width varies from 310 MHz to 1.24 GHz for the varactor-diode coupled filter, and it varies from 380 MHz to 2.18 GHz for the filter which is composed of low-pass and high-pass filters connected in series. The center frequency of the both filters can be changed arbitrarily.
3 citations
TL;DR: In this paper, a design procedure for a composite filter having interdigital input and output sections, separated by a λ/2 resonator, is outlined, and results from a prototype filter show improved characteristics by comparison with purely interdigital or parallel coupled filters.
Abstract: A design procedure for a composite filter having interdigital input and output sections, separated by a λ/2 resonator, is outlined. Results from a prototype filter show improved characteristics by comparison with purely interdigital or parallel coupled filters. The passband is in closer agreement with theoretical predictions than is usual for microstrip interdigital filters.
01 Oct 1980
TL;DR: In this paper, a two-resonator filter configuration is used for microwave integrated circuit technique, where YIG spheres are located over the microstrip line in the plane of short and the longitudinally inhomogeneous open stub is used as a short.
Abstract: The contribution presents a possible solution of magnetically tuned band-pass filter for use in microwave integrated circuit technique. Two-resonator filter configuration is used. YIG spheres are located over the microstrip line in the plane of short. The longitudinally inhomogeneous open stub is used as a short. Design of stub is based on the input impedance frequency dependence analysis of line section with arbitrary forms of characteristic impedance. Signal is transmitted by mutual coupling between resonators.
TL;DR: Achieser-Zolotarev filters are similar to the familiar Chebysbev filters except that the first ripple (DC end for low pass, HF end for high pass) is larger than the others, limiting the use of these filters to applications where only the upper part of the passband will be used as mentioned in this paper.
Abstract: Achieser-Zolotarev filters are similar to the familiar Chebysbev filters except that the first ripple (DC end for low pass, HF end for high pass) is larger than the others, limiting the use of these filters to applications where only the upper part (low pass), (lower part, high pass), of the passband will be used. The advantages of these filters are a slightly increased attenuation in the stopband and the ability to choose the impedance level within the filter. [1] In this letter it is pointed out that the impedance level may be chosen to produce filters with all even numbered elements equal in value giving a simpler filter. Tables for design of these filters are provided.
TL;DR: A careful analysis of a classical filter configuration with large stopbands is made and an understanding of the structure behaviour is gained that allows design on safe grounds.
Abstract: A careful analysis of a classical filter configuration with large stopbands is made. An understanding of the structure behaviour is gained that allows design on safe grounds. A 1.3 GHz microstrip prototype using parallel-coupled-lines inverters is presented. Design equations for this type of inverter are also given.