A study on Improving Intermodulation Signal of the RF Power Amplifier Using Microwave Absorber

Jeon, Joong-Sung; Kim, Min-Jung; Ye, Byeong-Duck; Kim, Dong-Il

Journal of Navigation and Port Research 2003;27(4):437-441.
Published online September 30, 2003.

전파흡수체에 의한 전력증폭기의 혼변조 신호의 개선 효과에 관한 연구

전중성, 김민정, 예병덕, 김동일

A study on Improving Intermodulation Signal of the RF Power Amplifier Using Microwave Absorber

Joong-Sung Jeon, Min-Jung Kim, Byeong-Duck Ye, Dong-Il Kim

Abstract

In this paper, the 30 W power amplifier for an IMT-2000 repeater was developed a gain flatness and the third IMD (Intermodulation distortion) by microwave absorber. The absorption ability of the absorber is shown up to -10 ㏈ and -4 ㏈ at 3.6 ㎓, 2.3 ㎓ band, respectively. The power amplifier without absorber has the gain over 57 ㏈, the gain flatness of ±0.33 ㏈ and the third IMD of 27 ㏈c at 33.3 W output. Otherwise, the power amplifier with absorber has the gain over 58㏈, the gain flatness of less than ±0.9, the third IMD over 29 ㏈c at the same output power. As a result, the characteristic of the different type shows improvement of 1 ㏈ in gain, 0.3 ㏈ in gain flatness and 1.77 ㏈c in IMD.

Key Words: RF 발진; Microwave Absorber;Intermodulation Distortion;Power Amplifier;Intermodulation;RF oscillation