[1] [1] CHO I K,KIM J T,JEONG M Y,et al.Analysis and optimization of passive intermodulation in microwave coaxial cavity filters[J]. ETRI Journal, 2003,5(2):133-139. doi:10.4218/etrij.03.0102.0214.

[2] [2] JARGON J A, EGROOT D C, REED K L. NIST passive intermodulation measurement comparison for wireless base station equipment[C]// 52nd ARFTG Conference Digest. Rohnert Park, CA, USA: IEEE, 1998, 34: 128-139. doi: 10.1109/ARFTG. 1998. 327325.

[3] [3] BOLLI P, SELLERI S, PELOSI G. Passive intermodulation on large reflector antennas[J]. IEEE Antennas and Propagation Magazine, 2002,44(5):13-20. doi:10.1109/MAP.2002.1077773.

[4] [4] SHITVOV A P, ZELENCHUK D E, SCHUCHINSKY A G, et al. Passive intermodulation in printed lines: effects of trace dimensions and substrate[J]. IET Microwaves,Antennas & Propagation, 2009,3(2):260-268. doi:10.1049/iet-map:20070314.

[5] [5] SHAYEGANI A, SALMON J, SINGH R. Multicarrier PIM behavior and testing in communications satellites[C]// 32nd AIAA International Communications Satellite Systems Conference. San Diego,CA:AIAA, 2014:4249. doi:10.2514/6.2014-4249.

[6] [6] CHOU S J,CHOU H T,KUO L R. Potential causes of PIM problems in the LTE outdoor base station multi-band antennas[C]// 2016 International Symposium on Antennas and Propagation(ISAP). Okinawa,Japan:IEEE, 2016:1080-1081.

[7] [7] YANG S, CHEN X, MI R, et al. Characterization of harmonic generation by spring contacts in mobile devices[J]. IEEE Transactions on Electromagnetic Compatibility, 2022,64(5):1313-1320. doi:10.1109/TEMC.2022.3174876.

[8] [8] LUI P L. Passive intermodulation interference in communication systems[J]. Electronics & Communication Engineering Journal, 1990,2(3):109-118. doi:10.1049/ecej:19900029.

[10] [10] CHEN X, HE Y N. Reconfigurable passive intermodulation behavior on nickel-coated cell array[J]. IEEE Transactions on Electromagnetic Compatibility, 2017,59(4):1027-1034. doi:10.1109/TEMC.2017.2654818.

[11] [11] SADJINA S,MOTZ C,PAIREDER T,et al. A survey of self-interference in LTE-advanced and 5G new radio wireless transceivers[J]. IEEE Transactions on Microwave Theory and Techniques, 2020,68(3):1118-1131. doi:10.1109/TMTT. 2019.2951166.

[12] [12] ZHAO X,HE Y,YE M,et al. Analytic passive intermodulation model for flange connection based on metallic contact nonlinearity approximation[J]. IEEE Transactions on Microwave Theory and Techniques, 2017,65(7):2279-2287. doi:10.1109/TMTT.2017. 2668402.

[14] [14] JIN Q Y,GAO J C,FLOWERS G T,et al. Modeling of passive intermodulation with electrical contacts in coaxial connectors[J]. IEEE Transactions on Microwave Theory and Techniques, 2018,66(9):4007-4016. doi:10.1109/TMTT. 2018.2838147.

[15] [15] CHEN X,WANG L,POMMERENKE D,et al. Passive intermodulation on coaxial connector under electro-thermal-mechanical multiphysics[J]. IEEE Transactions on Microwave Theory and Techniques, 2021,70(1):169-177. doi:10.1109/TMTT.2021.3103981.

[16] [16] VICENTE C,HARTNAGEL H L. Passive intermodulation at junctions[C]// International Microwave Symposium. Honolulu,HI, USA:[s.n.], 2007.

[17] [17] YANG S. Passive harmonic generation at spring contacts[D]. Missouri, USA: Missouri University of Science and Technology, 2019.

[18] [18] LI T J, ZHANG K, JIANG J, et al. Passive intermodulation analysis of single contact junctions of wire mesh[J]. Journal of Computational Electronics, 2018,17(1):101-109. doi:10.1007/s10825-017-1092-6.

[19] [19] RUSSER J,RAMACHANDRAN A,CANGELLARIS A,et al. Phenomenological modeling of Passive Intermodulation(PIM) due to electron tunneling at metallic contacts[C]// 2006 IEEE MTT-S International Microwave Symposium Digest. San Francisco,CA USA:IEEE, 2006:1129-1132. doi:10.1109/MWSYM.2006.249389.

[20] [20] JACKSON R L, CRANDALL E R, BOZACK M J. Rough surface electrical contact resistance considering scale dependent properties and quantum effects[J]. Journal of Applied Physics, 2015,117(19):195101-1-8. doi:10.1063/1.4921110.