28 GHz wideband filter using quartz crystal waveguide for massive MIMO antenna unit

Onaka, Kengo; Kojima, Hiroshi; Matsutani, Kei; Horita, Atsushi; Wada, Takuro; Koshino, Masayoshi; Kawashima, Makata; Nakajima, Noriaki

doi:10.1109/mwsym.2017.8058898

Cited by 7 publications

(1 citation statement)

References 4 publications

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“…A bandpass filters at 28 GHz frequency are designed, taking advantage of hybrid architecture planar/non-radiative dielectric waveguide technology, although the size of the filter is large [7]. Bandpass filter using a quartz crystal waveguide in a 28-GHz band was proposed in [8], taking advantage of temperature stability and power durability, but the size is also large. Waveguide topology has been used to design a dual bandpass filter at 26 GHz and 28 GHz, taking advantage of specifying bandwidths accurately for each passband and its inner band frequency selection provided by the chained response method; however, the problem remains the large size for millimeter-wave communications [9].…”

Section: Introductionmentioning

confidence: 99%

Compact Dual Bandpass Filter Using Dual-Split Ring Resonator for 5G Upper Microwave Flexible Use Services

Sowjanya

Vakula

2022

J Electromagn Eng Sci

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A novel, compact dual bandpass filter design is proposed for 5G upper microwave flexible use services. To realize the proposed design, a dual split-ring resonator structure coupled to the microstrip transmission line is used. The output responses have been validated using vector network analyzer N5222A. The measured filter records a frequency range of 23.8 GHz–25.98 GHz for the first passband and 28.05 GHz–28.7 GHz for the second band, with fractional bandwidths of 8.8% and 2.2%, respectively. The minimum insertion loss is observed to be 4.2 dB using microstrip technology, even at higher frequencies. The proposed design occupies the area of 0.4 λg×0.27 λg, where λg is guided wavelength at the lower band central frequency. Simulated and measured results are approximately compatible with each other. The proposed design is useful for fixed satellite service earth stations, terrestrial wireless operations, and 5G mobile communications applications.

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Section: Introductionmentioning

confidence: 99%

Compact Dual Bandpass Filter Using Dual-Split Ring Resonator for 5G Upper Microwave Flexible Use Services

Sowjanya

Vakula

2022

J Electromagn Eng Sci

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Monolithic ceramic waveguide filter using a transition between GCPW feed and ceramic waveguide for 28 GHz

Park,

Park

2024

Micro & Optical Tech Letters

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In this letter, a mm‐wave monolithic ceramic waveguide filter using a transition between a grounded coplanar waveguide (GCPW) feed and a ceramic waveguide has been proposed. The published studies on monolithic ceramic waveguide filters with wideband properties for the mm‐wave are lacking. A desired external quality factor, satisfying wide bandwidth, is achieved using both inductive and capacitive couplings in the transition. The inductive coupling is realized with a waveguide's hole directly connected to the microstrip line probe of the GCPW. The capacitive coupling is employed with the slots of both GCPW and ceramic waveguide, which are placed facing each other. Adopting the presented transition, the inline monolithic ceramic waveguide filter for a fourth‐order Chebyshev response was designed. The fabricated filter provided the insertion and return losses of lower than 1.2 dB and higher than 10 dB, respectively, at frequencies from 26.43 to 29.76 GHz, with a fractional bandwidth of 11.85%.

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Low loss substrate integrated filters made by laser micro-machining of alumina substrates

Perigaud

Marco

Drissi

et al. 2017

2017 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-A

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28 GHz wideband filter using quartz crystal waveguide for massive MIMO antenna unit

Cited by 7 publications

References 4 publications

Compact Dual Bandpass Filter Using Dual-Split Ring Resonator for 5G Upper Microwave Flexible Use Services

Compact Dual Bandpass Filter Using Dual-Split Ring Resonator for 5G Upper Microwave Flexible Use Services

Monolithic ceramic waveguide filter using a transition between GCPW feed and ceramic waveguide for 28 GHz

Low loss substrate integrated filters made by laser micro-machining of alumina substrates

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