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Zhenjiang, China

Ye M.,Xian Jiaotong University | Wu C.,Xian Jiaotong University | He Y.,Xian Jiaotong University | Zhang H.,Xian Jiaotong University | And 2 more authors.
Dianbo Kexue Xuebao/Chinese Journal of Radio Science | Year: 2015

The passive intermodulation (PIM) characteristics of S-band waveguide to coaxial adapter are studied experimentally using PIM analyzer. Firstly, the prototype adapter is measured and it is found that its 3rd PIM level is about-56 dBm when the power of input carriers is 40 dBm. Secondly, the prototype adapter PIM performance is ascribed to the following two factors: the effect of nickel plate on the outer conductor of the coaxial connector and the metal contact effect between the tuning disk and the inner conductor of the connector. The explanation is verified through PIM measurement of modified prototype adapter. Lastly, considering the ordinary low PIM design rules, a low PIM adapter is designed and manufactured. The measurement result show that its 3rd order PIM is about -114 dBm when input carrier is 43 dBm. The developed adapter can be used in antenna feeding system or PIM test setup for waveguide flange. ©, 2015, Chinese Research Institute of Radiowave Propagation. All right reserved.

Ye M.,Xian Jiaotong University | Xiao Y.,Xian Jiaotong University | Tao C.,PIMTEK Instrument | Zou X.,PIMTEK Instrument | And 2 more authors.
Dianbo Kexue Xuebao/Chinese Journal of Radio Science | Year: 2014

In this paper, a preliminary experimental research on passive intermodulation (PIM) effect of microstrip lines is conducted using customized PIM analyzer. First, various microstrip lines of 50Ω characteristic impedance with different lengths are designed and fabricated on microwave dielectrics. Then, the microstrip lines are connected to the PIM analyzer through low PIM silver plated N type coaxial connector and their PIM products are measured. Measurement results show that the 3rd PIM products increases about 2.7 dB when input carrier increases 1 dB; PIM products tend to decrease with increasing carrier frequency; PIM products increases with the length of microstrip lines; microwave dielectrics also has notable effect on PIM products. The obtained results can provide reference for design of high performance microwave integrated circuits. © 2014 Chinese Journal of Radio Science.

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