Monolithic 3D printed waveguide filters with wide spurious-free stopbands using dimpled spherical resonators

Guo, Cheng1,2; Yu, Yang2,3; Li, Sheng4; Wen, Xiaozhu1; Zhang, Anxue1; Wang, Yi2; Attallah, Moataz1

2021-07-01

10.1049/mia2.12178

IET Microwaves Antennas & Propagation   影响因子和分区

1751-8725

1751-8733

Employing a family of dimpled and slotted spherical resonators, and a set of X-band waveguide bandpass filters (BPFs) is presented in this study. The resonators originated from spherical resonators with depression (hence, dimples are formed) and cutting slots into the resonator shell. With a large number of experiments, the combination of using the twisted coupling topology, depression and slotting on the resonators results in filters with simultaneous low insertion loss (IL), good out-of-band rejection and wide spurious-free stopband. Several BPFs are designed and 3D printed using the selective laser melting (SLM) technique where they are made in one piece. The monolithic implementation of these filters is allowed by the compatibility of the microwave and the mechanical design, which minimises the required supporting structures inside the filters. The measurement results show ILs of 0.2-0.3 dB and are better than 15 dB return loss. There is a small frequency shift of less than 0.9%, and a measured spurious-free stopband covering the entire X-Ku bands (8.2-18 GHz) with rejection over 34 dB. Additionally, for the SLM printed devices, the influences of temperature to the S-parameter responses, as well as polishing, which lowers the losses, are included in this study.

SCI ; EI

英语

通讯

National Natural Science Foundation of China[62001367]

Engineering ; Telecommunications

Engineering, Electrical & Electronic ; Telecommunications

WOS:000672752800001

WILEY

20213210752076

Bandpass filters ; Resonators ; Scattering parameters ; Selective laser melting ; Spheres

Electric Networks:703.1 ; Electric Filters:703.2

Web of Science

1.Xi An Jiao Tong Univ, Sch Informat & Commun Engn, Xian, Shaanxi, Peoples R China
2.Univ Birmingham, Dept Elect Elect & Syst Engn, Birmingham, W Midlands, England
3.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
4.Univ Birmingham, Sch Met & Mat, Birmingham, W Midlands, England

Guo, Cheng,Yu, Yang,Li, Sheng,et al. Monolithic 3D printed waveguide filters with wide spurious-free stopbands using dimpled spherical resonators[J]. IET Microwaves Antennas & Propagation,2021,15:1657-1670.

Guo, Cheng.,Yu, Yang.,Li, Sheng.,Wen, Xiaozhu.,Zhang, Anxue.,...&Attallah, Moataz.(2021).Monolithic 3D printed waveguide filters with wide spurious-free stopbands using dimpled spherical resonators.IET Microwaves Antennas & Propagation,15,1657-1670.

Guo, Cheng,et al."Monolithic 3D printed waveguide filters with wide spurious-free stopbands using dimpled spherical resonators".IET Microwaves Antennas & Propagation 15(2021):1657-1670.