Micro-strip Predistortion Circuit for Millimeter-wave Travelling Wave Tube

YU Chongzhi; HU Boxiong; TANG Kangsong; WANG Gang; SU Xiaobao

doi:10.11999/JEIT160395

Volume 39 Issue 2

Feb. 2017

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Article Navigation > Journal of Electronics & Information Technology > 2017 > 39(2): 474-481

YU Chongzhi, HU Boxiong, TANG Kangsong, WANG Gang, SU Xiaobao. Micro-strip Predistortion Circuit for Millimeter-wave Travelling Wave Tube[J]. Journal of Electronics & Information Technology, 2017, 39(2): 474-481. doi: 10.11999/JEIT160395

Citation:

YU Chongzhi, HU Boxiong, TANG Kangsong, WANG Gang, SU Xiaobao. Micro-strip Predistortion Circuit for Millimeter-wave Travelling Wave Tube[J]. Journal of Electronics & Information Technology, 2017, 39(2): 474-481. doi: 10.11999/JEIT160395

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Micro-strip Predistortion Circuit for Millimeter-wave Travelling Wave Tube

doi: 10.11999/JEIT160395

1.
2.
(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China)

Funds:

The National Science and Technology Major Project (2012ZX01007004001), The National Natural Science Foundation of China (61401427)

Received Date: 2016-04-22
Rev Recd Date: 2016-09-23
Publish Date: 2017-02-19

Abstract

Abstract

With the development of communication technology, investigating predistortion circuit for Travelling Wave Tube (TWT) becomes more and more important. This paper analyzes the principle of nonlinearity generator based on the schottky diodes and the effects of the zero bias junction capacitor and series resistor of the diode Simulation Program with Integrated Circuit Emphasis (SPICE) model on the expansions of the circuit for the first time. The conventional micro-strip predistortion circuits, whose absolute or relative bandwidth are less than 1.8 GHz and 4%, work at below K band, and need isolators to match the input and output ports. Based on the Advanced Design System (ADS) software, it is designed that a micro-strip predistortion circuit for millimeter wave band TWT at center frequency 30 GHz, absolute bandwidth 2 GHz, and relative bandwidth 6.67%. The results of experiments show that the compressions variations of gain and phase are from 7.5 dB and 40, 7.3 dB and 50, 7.1 dB and 59to less than 3.8 dB and 10, 3.7 dB and 12, 2.4 dB and 15 for the TWT without and with the linearizer at 29 GHz, 30 GHz and 31 GHz respectively. The two tones test results show that the Input Power Back Off (IPBO) are 17 dB, 18 dB and 18 dB for the TWT, but 12 dB, 9 dB, and 8 dB for the Linearized TWT (LTWT), namely 5 dB, 9 dB, and 10 dB improvements with the linearizer at 29 GHz, 30 GHz, and 31 GHz respectively for the demand of 25 dBc Carrier to third InterModulation (C/IM3) ratioin in communication system. The linearity of TWT is clearly improved with the linearizer, which serves as a great value for engineering application.
- Travelling Wave Tube (TWT),
- Schottky diode,
- Predistorter,
- Expansion of gain and phase,
- Carrier to third InterModulation (C/IM3) ratioin

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