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Low Sidelobe Design of Microstrip Comb-Line Array Antenna Using Deformed Radiating Elements in the Millimeter-Wave Band
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- Authors
- Jae-In Lee, Jae-Ho Lee, Sang-Hoon Lee, Dong-Wook Seo
- Issue Date
- 2022-10
- Citation
- IEEE Transactions on Antennas and Propagation, v.7, no.10, pp.9930-9935
- ISSN
- 0018-926X
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- This communication presents a microstrip comb-line array antenna for the low sidelobe level (SLL) in the millimeter wave. As the width of the conventional stub-shaped radiating element becomes wider, not only the longitudinal current but also the transverse current increases; the longitudinal and transverse currents generate the co-and cross-polarized radiation, respectively. To reduce the transverse current flows on the large-width radiating element, the width of the connecting part with the feeding line in the radiating element is narrowed. In addition, the transverse current can be further reduced by adding a notch on the top of the radiating element. These two deformed radiating elements are proposed and used to design 18-element comb-line array antennas according to the array design procedure based on the radiation conductance. The array antennas were designed for the SLL of-20 dB at 79 GHz. The prototypes are fabricated and the antenna performance was measured. From the measurement results, the comb-line antenna composed only of the conventional stub-shaped elements shows the SLL of about-16.58 dB, whereas the array antenna using the proposed elements has the SLL of-19.4 dB. This communication demonstrates the feasibility of the proposed elements for low SLL, through analysis and measurement.