TY - GEN
T1 - An End-Fire Circularly Polarized Antenna with Small Clearance for Mobile Terminal Devices
AU - Li, Huacheng
AU - Lin, Wei
N1 - Publisher Copyright:
©2025 IEEE.
PY - 2025/8
Y1 - 2025/8
N2 - This paper presents a planar end-fire circularly polarized antenna with a simple configuration and minimal ground clearance for mobile terminals. It was developed based on a half-wavelength folded TE0.5,0 mode rectangular waveguide cavity functioning as a magnetic dipole (MD), which provides vertical polarization. By etching a Γ-shaped open-ended slot in the top metallic surface of the waveguide, another horizontally polarized electrical dipole (ED) mode is realized. The required 90° phase difference and equal amplitude for the pair of orthogonal polarization modes to achieve CP radiation in the end-fire direction can be attained by fine-tuning the slot dimension parameters. Simulated results indicate that the proposed antenna achieves an overlapped bandwidth (|S11|< -10 and AR < 3 dB) of 1.2%. In the end-fire direction, it can produce a CP beam with a peak gain of 2.4 within 85°. Furthermore, to broaden the antenna’s beamwidth, a two-element array arranged in a back-to-back configuration is proposed. Simulated results demonstrate that this method can significantly enhance the beamwidth to 130 °.
AB - This paper presents a planar end-fire circularly polarized antenna with a simple configuration and minimal ground clearance for mobile terminals. It was developed based on a half-wavelength folded TE0.5,0 mode rectangular waveguide cavity functioning as a magnetic dipole (MD), which provides vertical polarization. By etching a Γ-shaped open-ended slot in the top metallic surface of the waveguide, another horizontally polarized electrical dipole (ED) mode is realized. The required 90° phase difference and equal amplitude for the pair of orthogonal polarization modes to achieve CP radiation in the end-fire direction can be attained by fine-tuning the slot dimension parameters. Simulated results indicate that the proposed antenna achieves an overlapped bandwidth (|S11|< -10 and AR < 3 dB) of 1.2%. In the end-fire direction, it can produce a CP beam with a peak gain of 2.4 within 85°. Furthermore, to broaden the antenna’s beamwidth, a two-element array arranged in a back-to-back configuration is proposed. Simulated results demonstrate that this method can significantly enhance the beamwidth to 130 °.
KW - circularly polarized
KW - clearance for mobile terminal
KW - end fire radiation
KW - planar
KW - substrate integrated waveguide
UR - https://www.scopus.com/pages/publications/105018306705
U2 - 10.1109/IWEM65640.2025.11168031
DO - 10.1109/IWEM65640.2025.11168031
M3 - Conference article published in proceeding or book
AN - SCOPUS:105018306705
T3 - 2025 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition, iWEM 2025
SP - 4
EP - 6
BT - 2025 IEEE International Workshop on Electromagnetics
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2025 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition, iWEM 2025
Y2 - 4 August 2025 through 6 August 2025
ER -