Ultra Compact Inline $E$ -Plane Waveguide Bandpass Filters Using Cross Coupling
TL;DR: In this paper, the authors proposed ultracompact waveguide bandpass filters that exhibit pseudoelliptic responses with the ability to place transmission zeros on both sides of the passband to form sharp rolloffs.
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Abstract: This paper presents novel ultracompact waveguide bandpass filters that exhibit pseudoelliptic responses with the ability to place transmission zeros on both sides of the passband to form sharp rolloffs. The filters contain $E$ -plane extracted pole sections (EPSs) cascaded with cross-coupled filtering blocks. Compactness is achieved by the use of evanescent mode sections and closer arranged resonators modified to shrink in size. The filters containing nonresonating nodes are designed by means of the generalized coupling coefficients’ extraction procedure for the cross-coupled filtering blocks and EPSs. We illustrate the performance of the proposed structures through the design examples of third- and fourth-order filters with center frequencies of 9.2 and 10 GHz, respectively. The sizes of the proposed structures suitable for fabricating using the low-cost ${E}$ -plane waveguide technology are 38% smaller than ones of the ${E}$ -plane extracted pole filter of the same order.
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Figures
Fig. 8. Coupling scheme of a symmetric doublet. 
Fig. 10. Extracted generalized coupling coefficients of the E-plane waveguide doublet: (a) B1 vs. Lfin; (b) K2 vs. Wsep2; (c) K12 vs. Gap; (d) KN2 vs. Wsep1. 
Fig. 9. Analysis of the symmetric doublet using the even-odd mode technique: short and open schematic circuits. 
TABLE V Q-FACTORS COMPARISON 
Fig. 11. E-plane extracted pole section: (a) schematic representation; (b) coupling scheme representation. 
Fig. 12. Arrangement of E-plane inserts for the compact 3rd order cross coupled filter.
Citations
Substrate Integrated Waveguide (SIW) Bandpass Filter with Novel Microstrip-CPW-SIW Input Coupling
TL;DR: In this article, a Substrate integrated waveguide bandpass filter is presented with a novel CPW-to-SIW transition at both the input and output ports which also served as the input/output couplings into the filter.
Design of ultra compact pseudo-elliptic inline waveguide bandpass filters using inductive bypass coupling for various specifications
Uros Jankovic,N. Mohottige,Djuradj Budimir +2 more
- 08 May 2017
TL;DR: Practical implementation aspects of recently proposed ultra compact inline waveguide bandpass filters that utilise stopband performance of their pseudo-elliptic responses through positive sign bypass coupling are explored.
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Stopband Characteristics Improvement of Waveguide Planar E-plane Filters
TL;DR: In this article, a bandpass filter based on folded metal structures has poles of attenuation characteristics near the filter passband and they are designed in a fully symmetrical topology, which improves performance reproducibility, manufacturability and reduces manufacturing cost.
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Analysis and design of a substrate integrated waveguide multi-coupled resonator diplexer
Augustine O. Nwajana
- 01 Jan 2017
TL;DR: In this article, a 10-pole (10ᵗʰ order) microwave diplexer circuit has been successfully designed, simulated, manufactured and measured. And the measured results have been used to validate the circuit model and the electromagnetic (EM) simulated results.
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Narrow-Bandpass Waveguide Filters
A.E. Atia,A.E. Williams +1 more
TL;DR: In this paper, a procedure was described whereby narrow-band pass waveguide filters having ripple in both the passbands and stopbands can be synthesized in the form of coupled waveguide cavities.
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Characteristics of cross (bypass) coupling through higher/lower order modes and their applications in elliptic filter design
S. Amari,U. Rosenberg +1 more
TL;DR: In this article, the authors presented a new set of results concerning the use of higher/lower order modes as a means to implement bypass or cross coupling for applications in elliptic filter design.
225
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TL;DR: In this paper, a general and direct synthesis technique of pseudoelliptic inline filters with arbitrarily placed attenuation poles (APs) at real frequencies is presented, where APs are brought about and independently controlled by dedicated resonators, which are coupled to nonresonating nodes.
207