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J. Electromagn. Eng. Sci > Volume 24(5); 2024 > Article
Journal of Electromagnetic Engineering and Science 2024;24(5):494-503.
DOI: https://doi.org/10.26866/jees.2024.5.r.251    Published online September 30, 2024.
Millimeter-Wave Far-Field Range Antenna Measurement System for a W-Band Monopulse Antenna
In-June Hwang1  , Jong-Gyun Baek2  , Jaesik Kim3  , Jeong-Il Park1  , Dae-Chan Kim1  , Heeduck Chae2  , No-Weon Kang1  , Chihyun Cho1 
1Eelectromagnetic Wave Metrology Group, Korea Research Institute of Standards and Science, Daejeon, Korea
2Microwave and Antenna R&D, LIG Nex1, Yongin, Korea
3Agency for Defense Development, Daejeon, Korea
Correspondence:  No-Weon Kang,Email: nwkang@kriss.re.kr
Chihyun Cho,Email: chihyun.cho@kriss.re.kr
Received: 25 September 2023   • Revised: 11 January 2024   • Accepted: 18 February 2024
Abstract
In this study, a millimeter-wave far-field range antenna measurement system is proposed for W-band monopulse antenna measurements. Since the W-band monopulse antenna installed in radar systems has many input/output ports, multiple calculations are required to measure all the ports. We propose a system structure capable of the simultaneous measurement of multiple channels to quickly and accurately measure the performance of a monopulse antenna. The proposed measurement system includes a multi-channel rotary joint, a pair of diplexers, and multiple vector network analyzer extenders. In addition, an RF sub-system is implemented to reliably measure the phase of the W-band radiation pattern. It utilizes a shared local oscillator source and external power amplifiers for the transmit and receive paths. Employing the proposed multi-channel antenna measurement system, the sum/difference channels of a monopulse antenna were simultaneously measured according to the azimuth angle. In addition, a comparison of the far-field measurements provided by the proposed system and the near-field measurements was conducted.
Key words: Antenna Measurements, Far-Field Radiation Pattern, Millimeter-Wave Measurements, Millimeter-Wave Radar, Monopulse Antennas
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