Dielectric-Loaded Miniaturized Cavity Bandpass Filter with Improved Power Capacity

Rong, Chuicai; Xu, Yong; Zhang, Yuming

doi:10.3390/electronics11091441

Cited by 4 publications

(3 citation statements)

References 39 publications

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“…It can be further improved up to 6000 W by increasing the gap size. Additionally, it was shown in [29] that lamination with a dielectric material (e.g., Teflon) can further enhance the power handling capabilities.…”

Section: B Inset Resonator Modelmentioning

confidence: 99%

Design of Compact Quasi-Elliptic Bandpass Filters Based on Coaxial Inset Resonators

2023

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This article reports a novel inset resonator configuration for coaxial filter applications with quasi-elliptic responses. The design and analysis of the inset resonator are discussed in detail and accurately modeled as a capacitively-loaded stepped-impedance half-wavelength resonator featuring more compactness, high quality factor, and enhanced spurious responses in comparison with conventional halfwavelength and combline resonators. Additionally, the operating frequency can be tuned intrinsically through the displacement of the coaxial resonator, eliminating the need for any additional tuning elements and maintaining a stable quality factor. Two quasi-elliptic inset resonator type filters are implemented in planar and longitudinal coupling configurations, respectively. The first takes the form of a folded four-pole 2.93 GHz filter with two symmetrical transmission zeros. The fabricated filter has a compact structure of 29.76 cm 3 , an insertion loss better than 0.73 dB, a return loss better than 18 dB, and a wide spurious-free band up to 3.5•f 0 . The second inset-type quasi-elliptic filter is realized in a longitudinal inline arrangement. An example of a 2.53 GHz three-pole filter is presented with a closely-positioned transmission zero, wide spurious-free band (≈3•f 0 ), and a very compact structure of 55.7×33×33 mm 3 .

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Section: B Inset Resonator Modelmentioning

confidence: 99%

Design of Compact Quasi-Elliptic Bandpass Filters Based on Coaxial Inset Resonators

2023

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“…In this context, cross-coupled structures capable of generating transmission zeros out-of-band in order to be able to improve frequency selectivity have been created [10][11][12] In addition, the filter size reduction is inevitably accompanied by a reduction of the cavity power capacity. Therefore, it is crucial to consider the power capacity [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Design of a New Capacitive Load Cross-Coupled Cavity Filter

Wang

et al. 2022

Electronics

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This paper presents a new design method for a capacitor-loaded cross-coupled cavity filter, which significantly increases the power capacity of the cavity filter while improving out-of-band rejection. The filter uses a coaxial resonator at the open end of the donut capacitive-load. A triangular form of cavity structure is used for the full-cavity arrangement to reduce the size of the filter. In order to validate the design, a filter with a center frequency of 2.08 GHz and bandwidth of 80 MHz was designed, processed, and tested. The measured insertion loss was ≤0.97 dB, and the return loss was >20 dB in the range of 2040 MHz to 2120 MHz; the rejection was as high as 80 dB, and in-band ripple was 0.06 dB in the upper and lower stopband-range, which was only 30 MHz away from the sideband. After a simulation of the model using HFSS software (HFSS 2021, Canonsburg, PA, USA), the measured results matched the simulation results, which verified the correctness and practicality of the design. Compared with the ordinary-disc-load resonant cavity, the new donut capacitively loaded cavity-bandpass-filter has a 13.2% reduction in height and a 29.7% increase in power capacity.

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“…When two stripline resonators are placed side by side, the electrical coupling E c mainly exists through the upper half space coupling window, while the magnetic couplingM c mainly exists through the lower half space coupling window. When there are coupling windows in the upper and lower spaces of both stripline resonators, that is, there are both electrical and magnetic coupling between the two resonators, the total coupling coefficientk is frequency dependent, and the transmission zerof tz produced by the frequency dependent coupling as follow [6][7][8][9][10][11][12]:…”

mentioning

confidence: 99%

Design of novel stripline diplexer using frequency dependent couplings

Song,

Rong,

Zhu

et al. 2023

Preprint

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A novel stripline diplexer design using frequency dependent couplings to achieve multiple transmission zeros is developed in this paper. The transmission zeros generated by the frequency dependent couplings are flexible and controllable, on the basis of the existing cross-coupled, more transmission zeros are introduced to improve the frequency selection characteristics. Based on this characteristic, we designed a 2.6G Hz diplexer, its transmitting channel filter is 5 order with 4 transmission zeros, and the receiving channel filter is 4 order with 5 transmission zeros. We fabricated and measured it, the synthesis results, simulation results, and the tested results are well matched with each other, which will provide more flexibility in the design of diplexers for wireless communication system.

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Dielectric-Loaded Miniaturized Cavity Bandpass Filter with Improved Power Capacity

Cited by 4 publications

References 39 publications

Design of Compact Quasi-Elliptic Bandpass Filters Based on Coaxial Inset Resonators

Design of Compact Quasi-Elliptic Bandpass Filters Based on Coaxial Inset Resonators

Design of a New Capacitive Load Cross-Coupled Cavity Filter

Design of novel stripline diplexer using frequency dependent couplings

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