Design of a Broadband Frequency-Scanning Continuous Transverse Stub Antenna with Segmented Metal Stubs

• Published in: 2024 International Conference on Microwave and Millimeter Wave Technology (ICMMT) Vol. 1; pp. 1 - 3
• Main Authors: Han, Xuchen, He, Yingran, Zhang, Liansong
• Format: Conference Proceeding
• Language: English
• Published: IEEE 16.05.2024
• Subjects: Apertures; broadband; continuous transverse stub (CTS); matching stub; Metals; Microwave technology; Millimeter wave technology; Reflection coefficient; segmented metal stubs; Slot antennas; Surface waves
• ISSN: 2994-3124
• DOI: 10.1109/ICMMT61774.2024.10672117

A broadband continuous transverse stub (CTS) antenna is designed in this paper. Guided by the theory of periodic structure, the period of the radiation slot is designed to ensure high-frequency and low-frequency beam scanning angles within certain range. In order to solve the deterioration of reflection coefficient at boresight radiation, a matching stub is loaded on the lower surface of each metal stub. Compared with the ones without matching stub, the reflection coefficients can be reduced by 10~15 dB. In the further design, a segmented stub with different slot widths are designed, in order to effectively balance the aperture efficiency at high-frequency and low-frequency bands. Finally, the CTS antenna model is simulated. In the range of 12~22 GHz (58.8%), the reflection coefficient is below −18 dB. The peak gain is 24.7%30.59 dBi and the radiation angles can be scanned from −40.3° to 17.7°. In the entire frequency band, the aperture efficiency is higher than 45%. Compared with the two CTS antennas with same slot widths, there are both about 10% improvements at high and low frequency respectively.