Monolithic 3D‐printed slotted hemisphere resonator bandpass filter with extended spurious‐free stopband

Li, Jin; Li, Sheng; Huang, Guangtao; Yuan, Tao; Attallah, Moataz M.

doi:10.1049/el.2018.7850

Cited by 8 publications

(9 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, they suffer from higher order modes that are close in frequency to the fundamental TM 101 mode, and this degrades the out of band performance of the filter. This problem has been investigated by using the rotated topology [14], the depressed super-ellipsoid cavity [3], and the slotted spherical resonators [20,21]. Electrical conductivity of the cavity walls is assumed to be 3.56 × 10 7 S/m in the CST simulation.…”

Section: Introductionmentioning

confidence: 99%

A 3-D Printed Bandpass Filter Using TM₂₁₁-Mode Slotted Spherical Resonators With Enhanced Spurious Suppression

et al. 2020

View full text Add to dashboard Cite

This paper presents a Ka-band fourth-order slotted spherical resonator waveguide bandpass filter (BPF) with a wide spurious suppression stopband. It uses the first higher-order TM 211 mode rather than the fundamental TM 101 mode of the spherical resonator in order to obtain a higher unload quality factor (Q u) for smaller in-band insertion loss, as well as a larger filter volume that gives better tolerance to fabrication errors in high frequency applications. By introducing slots that interrupt surface currents, the fundamental TM 101 and two higher spurious modes (TE 101 and TM 311) can be suppressed without compromising the unloaded quality factor of the TM 211 mode. In addition, the filter topology is optimized to further enhance the suppression level of the spurious passbands. A Z-shaped topology has been found effective in decreasing the coupling strength of the spurious TM 311 mode. An analysis is performed to demonstrate the better tolerance of the Z-shaped filter over the conventional TM 101-mode spherical resonator filter. For verification, a fourth-order slotted spherical resonator waveguide BPF with a center frequency of 31 GHz and bandwidth of 880 MHz is designed and manufactured using a selective laser melting (SLM) 3-D printing process. The measured results show an average in-band insertion loss of 1.53 dB, and a passband return loss better than 13.6 dB. The stopband of the filter is extended up to 40.9 GHz with a rejection level greater than 20 dB.

show abstract

Section: Introductionmentioning

confidence: 99%

A 3-D Printed Bandpass Filter Using TM₂₁₁-Mode Slotted Spherical Resonators With Enhanced Spurious Suppression

et al. 2020

View full text Add to dashboard Cite

show abstract

“…However, the spurious resonances deteriorate the filter's stopband performance. To alleviate this, several approaches have been presented to improve the stopband performance in recent years [5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]. For one possible approach, the spurious passband can be effectively suppressed by cascading the filter with a lowpass filter [5,6,7], however, this gives additional loss and size.…”

Section: Introductionmentioning

confidence: 99%

“…Another approach was focusing on the magnetic field features of the higher-order modes, where the couplings of higher-order modes were designed so that these higher-order modes can be effectively reduced [8,9,10]. As the 3 rd approach, slots can be added onto the resonators to radiate the undesired spurious resonances [11,12,13,14,15,16,17,18,19]. However, this may cause potential electromagnetic (EM) interference problems.…”

Section: Introductionmentioning

confidence: 99%

An X-band waveguide bandpass filter with enhanced stopband using offset resonators

Líu

Zhang

Guo

et al. 2021

IEICE Electron. Express

View full text Add to dashboard Cite

“…For the BPFs with higher operating frequency, the transmission loss and filtering properties usually turn worse. To realise low loss, the 3D‐printed waveguide was used for a X‐band filter [1]. However, the circuit size of the introduced BPF was quite large.…”

Section: Introductionmentioning

confidence: 99%

Compact Ku‐band LTCC bandpass filter using folded dual‐composite right‐ and left‐handed resonators

Shen

Che

2020

Electron. lett.

View full text Add to dashboard Cite

A compact Ku-band bandpass filter is proposed by using lowtemperature cofired ceramic (LTCC) technology in this Letter. For miniaturisation, the folded dual-composite right-and left-handed (D-CRLH) resonator is introduced. By folding the inter-digital capacitor and microstrip section inductor in multiple metal layers, the circuit size of D-CRLH resonator can be reduced to one third of the planner one. Furthermore, the additional transmission loss caused by reverse currents is also investigated. To this end, a very compact LTCC filter is designed, fabricated, and measured, with the core circuit size smaller than 0.91 × 0.95 × 0.29 mm 3. The minimum insertion loss is 1.95 dB at 13 GHz while with wide stopband suppression from 14.3 to 33.1 GHz.

show abstract

Monolithic 3D‐printed slotted hemisphere resonator bandpass filter with extended spurious‐free stopband

Cited by 8 publications

References 7 publications

A 3-D Printed Bandpass Filter Using TM₂₁₁-Mode Slotted Spherical Resonators With Enhanced Spurious Suppression

A 3-D Printed Bandpass Filter Using TM₂₁₁-Mode Slotted Spherical Resonators With Enhanced Spurious Suppression

An X-band waveguide bandpass filter with enhanced stopband using offset resonators

Compact Ku‐band LTCC bandpass filter using folded dual‐composite right‐ and left‐handed resonators

Contact Info

Product

Resources

About