Theoretical calculation of power densities in the near‐field region of phased array antenna

• Published in: Microwave and optical technology letters Vol. 63; no. 1; pp. 367 - 371
• Main Authors: Kim, Ilkyu, Lee, Jeong‐Hae
• Format: Journal Article
• Language: English
• Published: Hoboken, USA John Wiley & Sons, Inc 01-01-2021; Wiley Subscription Services, Inc
• Subjects: Antenna arrays; Antennas; Coupling; Mathematical analysis; near‐field region; phased array antennas; Phased arrays; power densities; Sidelobes
• ISSN: 0895-2477; 1098-2760
• DOI: 10.1002/mop.32654

While a phased array antenna offers new possibilities for cutting edge technologies, implementation of the array antenna raises an important motivation for computing the power densities in the proximity distance where its radiation becomes substantial. In this paper, the power densities of the antenna in the near‐field region is computed using the integral coupling formula based on the far‐field pattern easily attainable using a full‐wave simulation or a measurement. This feature enables to extend its applicability to the practical phased array antenna, which is different from the existing approaches that are restricted to the theoretically derived field distribution of the aperture antennas. Based on the far‐field pattern, the coupling program enables to provide the rapid computation (8.4‐9.7 seconds for a displacement) without a repetition of the lengthy theoretical derivation for each type of antennas. The calculated power densities for the array antenna has a deviation less than 0.7‐1.2 dB for the main beam and 3‐4 dB for the side lobe, which is comparable to the previous works.