T-shaped Dual-Mode Waveguide Filters with Low Manufacturing Complexity for mm-Wave Applications

Miek, Daniel; Kamrath, Fynn; Boe, Patrick; Höft, Michael

doi:10.1109/imfw49589.2021.9642330

Cited by 3 publications

(5 citation statements)

References 6 publications

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“…6 is manufactured as proof of concept. As discussed in [22], basically two cutting planes, which are required for the manufacturing, are available. On the one hand, the filter can be manufactured as a quasi H-plane cut, where both stubs are processed in one filter half and the remaining structure is manufactured in the other half.…”

Section: Manufacturing and Measurement Resultsmentioning

confidence: 99%

“…On the one hand, the filter can be manufactured as a quasi H-plane cut, where both stubs are processed in one filter half and the remaining structure is manufactured in the other half. However, this approach is disadvantageous in terms of manufacturing accuracy and losses [22]. Surface currents flowing over the cutting plane reduce the unloaded quality factor while additionally the stubs might be difficult to manufacture (high aspect ratio).…”

Section: Manufacturing and Measurement Resultsmentioning

confidence: 99%

“…The filter order can therefore be reduced as rejection specifications might be efficiently realized. The article proposed here extends our basic investigations in [22]. The approach using stub-loaded cavities is primary based on the stubbed waveguide principle discussed in [23] and [24], where a TE 201 mode cavity with one or optionally two E-plane stubs is used to realize highly compact filters at moderate frequencies (around 21 GHz as well as 31 GHz).…”

Section: Introductionmentioning

confidence: 87%

“…The value of the self-couplings of both NRNs is set to zero in this case [21], [32], [33]. As the coupling inverter has a length of approximately a quarter wavelength, this seems to be a physically more meaningful description than the one initially proposed in [22], where only one NRN is placed in the coupling scheme to couple both cavities. Furthermore, the simulated S-Parameters might be modeled more precisely by utilizing this approach.…”

Section: B Higher Order Filter Design and Coupling Matrix Descriptionmentioning

confidence: 99%

“…Based on the concepts in [23], [24], [25] and in extension to [22], this paper proposes quasi-elliptical waveguide filters based on the stub-approach. The focuses lie on an easy fabrication at mm-wave frequencies and the realization by high-precision CNC milling.…”

Section: Introductionmentioning

confidence: 99%

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Quasi-Elliptical Stub-Based Multi-Resonance Waveguide Filters With Low Manufacturing Complexity for mm-Wave Applications

et al. 2023

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In this paper, the design and realization of quasi-elliptical waveguide filters with reduced manufacturing complexity are discussed. The filters are based on TE mode cavities, which are loaded with TM mode stubs. It is shown that dual-, triple-and quadruple-resonance segments are obtained by using up to three stubs loaded on the broad side of a TE mode cavity. The structures obtained can either be used as a stand-alone filter or even as a building block suitable for the realization of higher order filters. The multiresonance blocks reveal several advantages in the mm-wave area: The manufacturing complexity is easy to handle and comparable to simple all-pole filters, which is especially important at high frequencies. Therefore, three prototypes are manufactured as proof of concept in the D-band (110 GHz-170 GHz). Moreover, the building blocks are able to produce n − 1 transmission zeros (TZs) with n being the number of resonances. Therefore, the blocks generate between one (dual-resonance) and up to three (quadruple-resonance) TZs. Advantageously, the filters can be cut in the E-plane in order to reduce the insertion loss and hence consist of only two components. Three examples are manufactured by high precision CNC milling and reveal good agreement to the simulation by obtaining unloaded Q-factors of up to 1000.INDEX TERMS D-band filter, E-plane cut, high precision CNC milling, reduced manufacturing complexity, TM mode stub.

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Section: Manufacturing and Measurement Resultsmentioning

confidence: 99%

Section: Manufacturing and Measurement Resultsmentioning

confidence: 99%