scholarly journals Investigation of the cutting plane and tolerance analysis of cross-coupled W-band waveguide filters with multiple transmission zeros by source to load cross-coupling

2021 ◽  
pp. 1-10
Author(s):  
Daniel Miek ◽  
Chad Bartlett ◽  
Fynn Kamrath ◽  
Patrick Boe ◽  
Michael Höft
Keyword(s):  
Cross Coupling ◽  
Tolerance Analysis ◽  
Cutting Plane ◽  
Numerical Control ◽  
Transmission Zeros ◽  
W Band ◽  
Band Filter ◽  
Spurious Mode ◽  
Waveguide Filters ◽  
Manufacturing Accuracy

Abstract In this paper, the influence of the cutting plane as well as the orientation of the cavities in cross-coupled W-band waveguide filters are investigated. When waveguide filters are manufactured with the commonly known CNC (computer numerical control) milling technique, at least one cutting plane is required. The position of this cutting plane has an impact on the composition of the cavities, the manufacturing accuracy, and on the maximal number of transmission zeros (TZs) introduced by a direct source to load (SL) cross-coupling. Similar filter set-ups therefore may show different performances depending on the position of this cutting plane. To examine all these effects, three similar fourth-order W-band filter set-ups are realized with distinct cutting planes and different oriented cavities. The filters are compared in terms of the sensitivity to manufacturing tolerances, the maximal number of TZs introduced by a direct SL cross-coupling as well as their spurious mode performance.

Two- and Four-Pole Multilayer SIW Filter with High Selectivity and Higher-Order Mode Suppression

Frequenz ◽  
2019 ◽  
Vol 73 (5-6) ◽  
pp. 209-217 ◽  
Author(s):  
Dinghong Jia ◽  
Quanyuan Feng ◽  
Qianyin Xiang
Keyword(s):  
High Selectivity ◽  
Filter Design ◽  
Design Method ◽  
Single Layer ◽  
Cross Coupling ◽  
Bandpass Filters ◽  
Coupling Scheme ◽  
Transmission Zeros ◽  
Compact Size ◽  
Spurious Mode

Abstract This letter presents an approach to design two-pole source-load coupling and four-pole cross-coupling substrate integrated waveguide (SIW) bandpass filters based on multilayer process. Utilizing the field distribution, the vertical magnetic and electric coupling of fundamental mode is designed by suppressing the first spurious mode. Then, source-load and cross-coupling schemes are realized with controllable features in two-pole and four-pole filters, respectively. The harmonic passband produced by TE102 mode can be suppressed by proper coupling technique enabling the connection with TE102 mode in two- and four-pole filter designs, respectively. Three transmission zeros, which are derived from source-load coupling, are introduced around the passband of two-pole filter to improve its selectivity. In the four-pole filter design, a six-order cross-coupling scheme including source and load produces four transmission zeros around the passband, leading to a sharp selectivity. In addition, another transmission zero is generated at the adjacent location of the passband to improve the out-of-band rejection. Compared with conventional horizontally coupled filters made of single layer, the proposed filters show a compact size. To demonstrate the proposed design method, a two-pole and a four-pole double-layered SIW bandpass filters are fabricated and measured. Measured results show that the proposed filters exhibit high selectivity and good out-of-band rejection, as well as a good agreement between simulated and measured results.

Folded W-Band Waveguide Filters with Resonant Coupling Apertures for the Generation of Additional Transmission Zeros

Frequenz ◽  
2019 ◽  
Vol 73 (11-12) ◽  
pp. 379-388
Author(s):  
Daniel Miek ◽  
Ana Morán-López ◽  
Jorge A. Ruiz-Cruz ◽  
Michael Höft
Keyword(s):  
Fourth Order ◽  
Manufacturing Process ◽  
Filter Design ◽  
Resonant Coupling ◽  
Transmission Zeros ◽  
W Band ◽  
Waveguide Filters ◽  
Measurement Results ◽  
Realization Process ◽  
Good Agreement

Abstract In this paper the realization of multiple additional transmission zeros in folded W-band waveguide filters is discussed. The transmission zeros (TZs) can be placed symmetrically as well as asymmetrically in the near passband region of the filter and arise due to a resonant coupling between source and / or load. Third and fourth order filter set-ups are presented, showing in total between three and six TZs. These zeros can be used to improve the selectivity of the filter without increasing the overall order. The filter design and realization process is discussed. Subsequently, the measurement results are compared with simulation, showing good agreement. As the filters are designed for the W-band, the manufacturing process is connected with some difficulties which are addressed within this paper as well.

scholarly journals Techniques for the generation of multiple additional transmission zeros in H-plane waveguide filters

2020 ◽  
Vol 12 (8) ◽  
pp. 723-732
Author(s):  
Daniel Miek ◽  
Patrick Boe ◽  
Fynn Kamrath ◽  
Michael Höft
Keyword(s):  
Cross Coupling ◽  
Plane Waveguide ◽  
Destructive Interference ◽  
Proof Of Concept ◽  
Filter Order ◽  
Transmission Zeros ◽  
Waveguide Filters ◽  
Set Up ◽  
Good Agreement ◽  
Ku Band

AbstractIn this paper, different techniques for the generation of additional transmission zeros (TZs) in planar waveguide filters are investigated. In the classical theory, TZs are generated only by destructive interference of non-adjacent cavities, limiting the available number of TZs to the filter order itself. However, more approaches for the generation of TZs are known, including bypass-coupling in oversized cavities, frequency-dependent coupling apertures as well as dispersive/resonant TZs which can be realized by the direct source to load cross-coupling. The aim of this paper is to combine several of the strategies in one physical filter set-up to increase the maximal number of TZs beyond the filter order. Different Ku-band fourth-order filter set-ups are presented, showing in total between six and eight real as well as complex TZs. Three filters are manufactured as a proof of concept and compared with the simulation, showing very good agreement.

Design of Inline Waveguide Filters With Frequency-Variant Couplings Producing Transmission Zeros

2021 ◽  
pp. 1-1
Author(s):  
Giuseppe Macchiarella ◽  
Gian Guido Gentili ◽  
Nicolo Delmonte ◽  
Lorenzo Silvestri ◽  
Maurizio Bozzi
Keyword(s):  
Transmission Zeros ◽  
Waveguide Filters

An Equivalent-Plane Cross-Coupling Position Control for Contour-Accuracy Improvement in Three-Axis Free-Form Contour Following Tasks

2018 ◽  
Vol 141 (4) ◽  
Author(s):  
Jian-Wei Ma ◽  
De-Ning Song ◽  
Zhen-Yuan Jia ◽  
Wen-Wen Jiang ◽  
Fu-Ji Wang ◽  
...  
Keyword(s):  
Error Control ◽  
Position Control ◽  
Three Dimensional ◽  
Cross Coupling ◽  
Experimental Tests ◽  
Numerical Control ◽  
Free Form ◽  
Contouring Error ◽  
Contour Following ◽  
Better Than

To reduce the contouring errors in computer-numerical-control (CNC) contour-following tasks, the cross-coupling controller (CCC) is widely researched and used. However, most existing CCCs are well-designed for two-axis contouring and can hardly be generalized to compensate three-axis curved contour following errors. This paper proposes an equivalent-plane CCC scheme so that most of the two-axis CCCs or flexibly designed algorithms can be utilized for equal control of the three-axis contouring errors. An initial-value regeneration-based Newton method is first proposed to compute the foot point from the actual motion position to the desired contour with a high accuracy, so as to establish the equivalent plane where the estimated three-dimensional contouring-error vector is included. After that, the signed contouring error is computed in the equivalent plane, thus a typical two-axis proportional-integral-differential (PID)-based CCC is utilized for its control. Finally, the two-axis control commands generated by the typical CCC are coupled to three-axis control commands according to the geometry of the established equivalent plane. Experimental tests are conducted to verify the effectiveness of the presented method. The testing results illustrate that the proposed equivalent-plane CCC performs much better than conventional method in both error estimation and error control.

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