A novel Re-entrant Cap Tuning Technique For TM-Mode Dielectric Resonators and Filters

Widaa, Abdulrahman; Höft, Michael

doi:10.1109/imfw49589.2021.9642354

Cited by 4 publications

(6 citation statements)

References 11 publications

(11 reference statements)

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“…The movable re-entrant cap tunes the resonant frequency by two means, simultaneously: 1) the part which intrudes the cavity around the DR, and 2) the part outside the cavity which functions as a movable sidewall. As result, wider tuning ranges (i.e., > 90%) can be obtained in comparison with the traditional screw-based tuning [50]. Besides, the proposed technique has the advantage of improved spurious performance over tuning [50], unlike in the other screw/disk-based designs where unwanted spurious resonances could appear at lower states due to the tuning elements.…”

Section: Tuning Concept and Design Principles A Tunable Tm-mode Diele...mentioning

confidence: 96%

“…As result, wider tuning ranges (i.e., > 90%) can be obtained in comparison with the traditional screw-based tuning [50]. Besides, the proposed technique has the advantage of improved spurious performance over tuning [50], unlike in the other screw/disk-based designs where unwanted spurious resonances could appear at lower states due to the tuning elements. To verify the aforementioned features, a single resonator prototype is implemented and measured as depicted in Figs.…”

Section: Tuning Concept and Design Principles A Tunable Tm-mode Diele...mentioning

confidence: 96%

“…The chosen configuration is the dielectric combline resonator, which has high quality factor and good spurious performance, combining the merits of the dielectric-loaded resonators and metallic coaxial resonators [51]. The operation mode is the fundamental TM-mode TM 01δ where the E-field is focused in the middle of the resonator and the H-field resonates mainly in the DR surroundings [50]. The movable re-entrant cap tunes the resonant frequency by two means, simultaneously: 1) the part which intrudes the cavity around the DR, and 2) the part outside the cavity which functions as a movable sidewall.…”

Section: Tuning Concept and Design Principles A Tunable Tm-mode Diele...mentioning

confidence: 99%

“…In [50], we introduced a novel tuning technique for TMmode dielectric resonators using re-entrant caps. In this expanded article, widely octave-tunable TM-mode DR filters with constant absolute bandwidth are presented based on reentrant caps.…”

Section: Introductionmentioning

confidence: 99%

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Widely Tunable TM-Mode Dielectric Filters With Constant Absolute Bandwidth Using Re-Entrant Caps

Widaa

Höft

2023

IEEE J. Microw.

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This paper reports octave tunable dielectric combline bandpass filters with constant absolute bandwidth (CABW) using a novel re-entrant cap tuning technique. The resonant frequency is tuned by the hollow re-entrant cap penetrating into the filter cavity as an envelope around the dielectric resonator. This mechanism of tuning provides wider tuning capabilities and better spurious performance than the conventional screw-based tuning. Also, the cap tuners can be employed effectively to tune the input-output and inter-resonator couplings simultaneously with the frequency reconfiguration, enabling a CABW over a wide frequency tuning window. For proof of concept purposes, a single widely tunable resonator is presented with octave tuning ratio of 2.64:1, high quality factor from 1705 to 5480, and spurious-free band up to 3.44• f 0 . Afterwards, two octave tunable re-entrant cap filters are designed, fabricated, and tested. The first filter is a 78% widely tunable two-pole filter with a CABW of 43.5±12% MHz, low insertion loss equals to 0.28±0.03 dB, and a compact volume of 39 cm 3 . The second design is a four-pole octave tunable bandpass filter from 2.96 GHz to 1.36 GHz with a constant 69±13% MHz bandwidth, low insertion loss better than 0.6 dB, return loss higher than 16 dB, and a compact 62 cm 3 structure. According to our own knowledge, thanks to the proposed tuning mechanism, the presented designs are the first CABW octave tunable high Q waveguide-based filters, having the widest tuning ranges over all similar state-of-the-art-designs. Cap, constant bandwidth, dielectric resonator, high-performance, re-entrant, tunable. INDEX TERMS

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Section: Tuning Concept and Design Principles A Tunable Tm-mode Diele...mentioning

confidence: 96%

Section: Tuning Concept and Design Principles A Tunable Tm-mode Diele...mentioning

confidence: 96%

Section: Tuning Concept and Design Principles A Tunable Tm-mode Diele...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Widely Tunable TM-Mode Dielectric Filters With Constant Absolute Bandwidth Using Re-Entrant Caps

Widaa

Höft

2023

IEEE J. Microw.

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“…This mechanism suffers from severe deterioration in the Qu (even over a very small tuning window), and also the possible appearance of unwanted spurious resonances. Recently, we presented tuning concepts based on TM-mode resonators featuring compact structures and wide tuning capabilities > 90% [5], [6]. Unfortunately, they also experience noticeable deterioration in the Qu with the tuning process.…”

Section: Introductionmentioning

confidence: 99%

Inset Resonators and Their Applications in Fixed/Reconfigurable Microwave Filters

Widaa

Bartlett

Höft

2022

2022 IEEE/MTT-S International Microwave Symposium - IMS 2022

Self Cite

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This paper introduces a new so-called "inset" resonator configuration for fixed and tunable microwave filter applications. The proposed configuration has many attractive advantages in comparison with conventional structures, including miniaturized size, enhanced spurious performance, and wide tuning capabilities with the least deterioration in unloaded quality factor throughout the tuning window. For proof of concept purposes, a single inset resonator and a two-pole filter are designed, manufactured, and measured. The measurements agree very well with simulations. The measured prototypes demonstrate a wide spurious-free band, volume saving up to 50%, a wide tuning range > 41%, and a high Qu of 4004±2.4% with minimum variation throughout the tuning range.

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Design of Tunable Coaxial Bandpass Filter Based on Embedded Stepped Impedance Resonators

Zhou

Huo

2023

IEEE Access

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This paper describes a method for designing tunable coaxial bandpass filters based on an inserted coaxial stepped impedance resonator (SIR). The miniaturization of the coaxial resonator is realized by the shape of the stepped impedance structure. In addition, an extended tuning range can be achieved by utilizing the SIR. A third-order tunable bandpass filter with constant absolute bandwidth is designed and fabricated for verification. The fabricated filter exhibits a wide tuning range from 2.13 GHz to 3.54 GHz (52.4%), over which the absolute bandwidth (ABW) varies within 97.5 ± 5.5 MHz (±5.6%).INDEX TERMS Coaxial resonator, constant bandwidth, wide tuning range, tunable filter.

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A novel Re-entrant Cap Tuning Technique For TM-Mode Dielectric Resonators and Filters

Cited by 4 publications

References 11 publications

Widely Tunable TM-Mode Dielectric Filters With Constant Absolute Bandwidth Using Re-Entrant Caps

Widely Tunable TM-Mode Dielectric Filters With Constant Absolute Bandwidth Using Re-Entrant Caps

Inset Resonators and Their Applications in Fixed/Reconfigurable Microwave Filters

Design of Tunable Coaxial Bandpass Filter Based on Embedded Stepped Impedance Resonators

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