Abstract
A broadband T/R frond-end of active holographic imaging system is presented. Compact autodyne mode circuit structure front-end is adopted to achieve higher signal to noise ratio and higher reliability, which is beneficial to the after-end imagining. The factors that influence the dynamic range and the transverse resolution ratio of holographic imaging system have been analyzed. Wide-band oscillator, wide-band low noise amplifier and the tapered slot antennas are implemented to meet the requirements of the holographic imagining system. According to the measured results, the output power is uniform in the broadband working frequency. The sub-harmonic suppression is better than 25 dBc from the frequency of 28 GHz to 33 GHz. The isolation between antennas channel is greater than 20 dB. The experimental result shows that the performance of the front-end is good enough to meet the needs of active millimeter-wave holographic imaging system.
Highlights
With the development of millimeter wave technology, especially the decreasing cost and the elevating performance of millimeter wave devices, which have provided conditions to realize miniaturization, array and high reliability; and have laid the foundation for millimeter wave imaging system of commercial
Millimeter wave imaging has developed from the passive focal plane array imaging to more complex active imaging [1]
This paper proposes a ka-band broadband T/R frond-end of active holographic imaging system
Summary
With the development of millimeter wave technology, especially the decreasing cost and the elevating performance of millimeter wave devices, which have provided conditions to realize miniaturization, array and high reliability; and have laid the foundation for millimeter wave imaging system of commercial. (2015) A Broadband T/R Front-End of Millimeter Wave Holographic Imaging. The front-end T/R module’s performance plays the key role in the millimeter wave active holographic imaging system. This paper proposes a ka-band broadband T/R frond-end of active holographic imaging system. The circuits are designed, and the simulating and experimental results are given in this paper. This front-end T/R module has the advantages of compact, good performance, convenient processing. The T/R front-end is mainly composed of a phase locked loop frequency synthesizer and frequency multiplier link circuit, broadband radiation antenna, MMIC mixer and millimeter wave low noise amplifier. Frequency synthesizer provides baseband signal to frequency multiplier link, become broadband millimeter wave frequency synthesizer.
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