Multiple Band and Multiple Frequency Dielectric Resonators Tunable Filters for Base Stations

Pance, Kristi; Rochford, G.

doi:10.1109/eumc.2008.4751495

Cited by 9 publications

(6 citation statements)

References 2 publications

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“…For instance, a 4-pole 180 MHz K-band reconfigurable TE 311 waveguide filter was presented in [29] with 1.74% of frequency tuning and a Q factor from 3100 to 2600 using dielectric plates. To this end, coaxial and dielectric-loaded waveguides have gained more interest in many tunable filter applications due to their advantages of miniaturized structures, high Q, and good power handling capabilities [3], [30], [31], [32], [33], [34], [35], [36], [37], [38], [39], [40], [41], [42], [43], [44], [45], [46], [47], [48], [49]. For example, a CABW tunable coaxial filter was reported in [3] for future agile 5G Base Transceiver Stations (BTSs).…”

Section: Introductionmentioning

confidence: 99%

“…Also in [41] and [42], our group recently presented 40% tunable CABW coaxial filters with the least variation of Q factor over the tuning window using inset resonators. To provide more compactness and a higher Q factor than the coaxial filters, a couple of tunable dielectric resonator (DR) filters were proposed [43], [44], [45], [46], [47], [48], [49]. A four-pole 65 MHz C-band tunable dielectric combline filter was reported in [47] with a tuning window of 4.9% and a Q factor of 548 to 536.…”

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Widaa

Höft

2023

IEEE J. Microw.

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“…By rotating the angle of the feeding position, the transmission zero was shifted to the lower or the upper stopband. Some other researches which were about the coupling structure between DRs have been done before , excellent tunability in both bandwidth and frequency without affecting the Q in a DR filter was achieved in .However, the coupling strength was hard to be adjusted independently in the previous researches. In this letter, a novel coupling method is proposed to change the coupling nature between two TE 01 δ ‐mode DRs.…”

Section: Introductionmentioning

confidence: 99%

A novel approach for changing the coupling nature between TE₀₁_δ-mode dielectric resonators

Jia

Zhu

2015

Int J RF and Microwave Comp Aid Eng

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In this article, a novel coupling method which could easily change the coupling nature between two TE 01d -mode dielectric resonators (DRs) is presented. This method is based on electric field orientation of DR operating in TE 01d -mode, through altering the direction of the coupling structure in one DR, the coupled electric field orientation in the other DR would be changed along with the coupling nature between two resonators. To prove this method, two filters using cascaded quadruplet coupling structure have been designed, fabricated and measured. The coupling strength is enhanced due to the employ of two grounded mental cylinder on both sides of the copper sheet. In addition, a tuning screw is introduced between two DRs to adjust the coupling strength after mounting expediently. Measured results confirmed the predicted performance, showing that the coupling nature and coupling strength are controllable between two DRs. V C 2015 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:226-231, 2016.

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“…Now on the practical front, most of the people have used either waveguide technology or planar microstrip structures for the implementation of multiband filters [3][4][5][7][8][9]. Here we have used DRs because DR offer high Q (low loss), high power handling capability, smaller size, superior temperature stability, and volume ratio in comparison with any other known microwave filter technology [13][14][15][16][17][18][19][20][21]. In the past, the DR have been used for realization of single bandpass and bandstop filters [16], but very little work is done in case of dual-band bandpass filter [17][18][19], and virtually no literature found in case of multiband bandstop filters using DRs.…”

Section: Introductionmentioning

confidence: 99%

“…Here we have used DRs because DR offer high Q (low loss), high power handling capability, smaller size, superior temperature stability, and volume ratio in comparison with any other known microwave filter technology [13][14][15][16][17][18][19][20][21]. In the past, the DR have been used for realization of single bandpass and bandstop filters [16], but very little work is done in case of dual-band bandpass filter [17][18][19], and virtually no literature found in case of multiband bandstop filters using DRs. The main aim of this work is to design and develop direct coupled asymmetric dual-band bandstop filter which is realized with DR technology.…”

Section: Introductionmentioning

confidence: 99%

Dual-band dielectric resonator bandstop filters

Awasthi

Biswas

Akhtar

2014

Int J RF and Microwave Comp Aid Eng

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This article presents the design and implementation of a new asymmetric dual‐band bandstop filter using TE01δ mode dielectric resonator (DR) technology. The coupling matrix is generated by frequency transformation technique applied to advance filtering functions for direct‐coupled asymmetric dual‐band bandstop filter in cul‐de‐sac configuration. The proposed approach provides control of all the major parameters such as center frequencies, intercavity couplings, and input/output couplings of filter independently in both the designated bands. The dual‐band DR filters (2 × 2) pole, with return loss = 15 dB and percentage rejection bandwidth of 1.6 and 0.6% in two bands, at 9.96 and 10.15 GHz, respectively, are designed, built, and tested. The measured and simulated results are in good agreement over the desired band. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 25:282–288, 2015.

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Multiple Band and Multiple Frequency Dielectric Resonators Tunable Filters for Base Stations

Cited by 9 publications

References 2 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

A novel approach for changing the coupling nature between TE₀₁_δ-mode dielectric resonators

Dual-band dielectric resonator bandstop filters

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Multiple Band and Multiple Frequency Dielectric Resonators Tunable Filters for Base Stations

Cited by 9 publications

References 2 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

A novel approach for changing the coupling nature between TE01δ-mode dielectric resonators

Dual-band dielectric resonator bandstop filters

Contact Info

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Resources

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A novel approach for changing the coupling nature between TE₀₁_δ-mode dielectric resonators