Hybrid Inline TE/TM Mode Dielectric Resonator Filters with Wide Spurious Free Range and Controllable Transmission Zeros

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

doi:10.23919/eumc48046.2021.9338165

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…Based on the large distance between these resonators, this coupling is very weak. The outer TZ pair might be interpreted as a parasitic source to load coupling, which is caused by the integral effect of higher/lower order modes [34]. Spurious modes in the simulated filter are located below and above the passband at frequencies 4.1 GHz and 7.3 GHz, respectively.…”

Section: E Simulation Results and Manufacturingmentioning

confidence: 99%

Ceramic Additive Manufactured Monolithic X-Shaped TM Dual-Mode Filter

et al. 2022

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This paper presents a monolithic 3D-printed ceramic X-shaped dual-mode microwave filter. The filter is manufactured utilizing a lithography-based ceramic manufacturing (LCM) process, allowing the realization of the resonator as well as the housing in one single piece. Therefore, contact as well as alignment problems, usually arising between a ceramic in T M mode operation and a metallic enclosure, can conveniently be avoided. A fourth order dual-mode filter with a designed center frequency of 6 GHz and a bandwidth of 279 MHz is realized in alumina material. Practical design rules to be considered in the filter layout process as well as limitations imposed by the LCM approach are discussed. The outer surface of the ceramic cavity is subsequently metallized using a silver spray-coating. Advantageously, the metallization is only a few micrometers thick, wherefore the weight of the component can be reduced. The measurement results are compared to the simulation and reveal good agreement. A temperature stability measurement shows a center frequency downward shift of 0.22%.INDEX TERMS 3D-printed ceramic filter, additive manufacturing, alumina 3D printing, dielectric TM dualmode filter, monolithic ceramic filter.

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Section: E Simulation Results and Manufacturingmentioning

confidence: 99%

Ceramic Additive Manufactured Monolithic X-Shaped TM Dual-Mode Filter

et al. 2022

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“…Otherwise, the spurious-free range is often comparably small and higher order modes are comparatively close. One solution to overcome this drawback is to combine different resonator types / modes of operation or to use a wideband lowpass filter in cascade with the bandpass filter [3], [4], [5], [6]. TM-mode filters are a well-known alternative [7], [8], [9].…”

Section: Introductionmentioning

confidence: 99%

Dielectric TM-Mode Y-Shaped Doublet Structure

et al. 2023

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This paper discusses dielectric TM-mode filters based on high permittivity Y-shaped ceramics. It is shown that this type of ceramic operates as a dual-mode resonator and therefore contributes two reflection zeros as well as one transmission zero (TZ) to the filter response. Hence, it can be interpreted as a doublet structure and used for the realization of quasi-elliptical filter responses of different order. The dual-mode resonator can be used in multiple different filter set-ups: On the one hand, a combination with classical TM 010 -mode resonators is possible to allow the realization of TZs in an in-line filter configuration without using cross-coupling apertures. Therefore, negative or diagonal cross-couplings, which are often difficult to realize and handle, can be avoided. On the other hand, several Y-shaped ceramics can be coupled directly with each other to increase the number of TZs to n f z = n/2, where n is the order of the filter. Finally, it is shown that even a combination with extracted pole elements is realizable. Prototypes based on modular segments are manufactured as proof of concept. INDEX TERMS Doublet, dual-Mode, extracted pole, TM-mode, Y-shaped ceramic. This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/FIGURE 2. Second order filter including the input / output coupling as well as tuning screws: (a) top view and (b) bottom view.

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“…The first method is to use the balanced structure of the dielectric resonator filter to suppress harmonics [ 13 , 14 ], because differential feeding itself is a mode selection, but the differential feeding will produce a common mode response, and the early appearance of common mode is the main reason for inhibiting wide stopband. The second method [ 15 , 16 , 17 ] is to combine two different modes of dielectric resonators, which can significantly improve the spurious performance. However, due to the combination of two different types of resonators, the filter size is too large and the structure is complex.…”

Section: Introductionmentioning

confidence: 99%

A Low-Profile Dielectric Resonator Filter with Wide Stopband for High Integration on PCB

Lin,

Wang,

et al. 2023

Micromachines

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A low-profile dielectric resonator (DR) filter is proposed to achieve the feature of high integration and wide stopband. The high integration is due to the structure of printed circuit board (PCB) substrate instead of metal cavity, which can be easily integrated with other planar circuits. Thus, the proposed design can improve the integration level and reduce installation errors. Moreover, the out-of-band harmonics can be well suppressed by the structure combined with introducing rectangular hollowing in the center of the dielectric block, coupling the feed and loading 1/4λ wavelength branch. For demonstration, it is fabricated and measured. The simulated and experimental results with good agreement are presented, the insertion loss is as low as 1.1 dB, the profile height is only 0.77λg, and the stopband reaches 2.61f0.

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Hybrid Inline TE/TM Mode Dielectric Resonator Filters with Wide Spurious Free Range and Controllable Transmission Zeros

Cited by 4 publications

References 5 publications

Ceramic Additive Manufactured Monolithic X-Shaped TM Dual-Mode Filter

Ceramic Additive Manufactured Monolithic X-Shaped TM Dual-Mode Filter

Dielectric TM-Mode Y-Shaped Doublet Structure

A Low-Profile Dielectric Resonator Filter with Wide Stopband for High Integration on PCB

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