Differentially Fed Dual-Polarized Antenna Array Using a Structural Composite Transmission-Line Network

This communication introduces a Ku-band differentially fed dual-polarized antenna array (DPAA) using a structural composite transmission-line (SCTL) network. The dual-polarized antenna element is excited by a new hybrid differential structure with a dumbbell slot and two L-shaped probes, which gener...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2024-07, Vol.72 (7), p.6105-6110
Main Authors: Jin, Tianxiang, You, Yang, Min, Lingguo, Chen, Zhenzhong, Lu, Yunlong, Huang, Jifu
Format: Article
Language:English
Subjects:
Antenna arrays
Antennas
Differentially fed
Dipole antennas
Dual polarization (waves)
dual-polarized antenna array (DPAA)
Frequency measurement
Frequency ranges
high isolation and cross-polarization discrimination (XPD)
Impedance matching
Microstrip
Microstrip antenna arrays
Microstrip antennas
Microstrip transmission lines
Polarization
Polarized radiation
Power dividers
Radiation
structural composite transmission line (SCTL)
Substrate integrated waveguides
Substrates
Surface impedance
Transmission lines
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Summary:This communication introduces a Ku-band differentially fed dual-polarized antenna array (DPAA) using a structural composite transmission-line (SCTL) network. The dual-polarized antenna element is excited by a new hybrid differential structure with a dumbbell slot and two L-shaped probes, which generates dual-polarized radiation with high isolation and cross-polarization discrimination (XPD). The substrate integrated waveguide (SIW) and the differential power divider based on delay microstrip line constitute the SCTL, which is directly cascaded with the SCTL-based feeding network. A 2-D SCTL-based feeding network embedded with a dual-mode combiner is designed to establish the DPAA. A prototype of a 4\times 4 dual-polarized array with a three-layer dielectric substrate is fabricated for demonstration. The experimental results show that the DPAA has good impedance matching and directional radiation characteristics at 13.5-14.6 GHz. The measured peak gains are better than 18.4 dBi. In addition, the isolation and XPD are higher than 37.4 and 38.2 dB for dual polarization in this frequency range, respectively.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2024.3404259