Abstract
The substrate-integrated coaxial line (SICL) is a potential transmission line due to its good characteristics of high efficiency, nondispersive, and single operational mode. A tapered slot SICL balun is proposed, which can realize the impedance transformation from the microstrip line to the coplanar strip line (CPS). At the same time, the proposed balun can transform the quasi-TEM mode of the microstrip line to the TEM mode of CPS. A printed dipole radiator is designed and is fed by the proposed SICL balun to achieve the impedance matching. The dual-polarized radiation mode is realized by employing two orthogonal printed dipoles. For each polarization radiator, the CPS is bended to avoided the occlusion of two polarization ports and realize the direct assembling of two orthogonal printed circuits. What is more, the assembling method is advantageous to improve the port isolation degree and decrease the cross polarization level. To improve the ratio of front to back (F/B) of the radiation pattern, a cylindrical metal cavity is adopted. According to the results of simulation and experiments, the VSWR of each port is lower than 2, the isolation degree between two polarization ports is higher than 20 dB, and the cross polarization level at the boresight is lower than −20 dB at the operational frequency. The patterns of two ports are almost symmetric, and high radiation efficiency is obtained. The experimental results of the principle prototype verify the design schemes of the balun and the dual-polarized antenna. The proposed dual-polarized antenna fed by the tapered slot SICL balun is suitable for the airborne radar application.
Highlights
For the airborne radar, the dual-polarized system can achieve the remarkable improvement of operational performances
Two polarized dipole radiators of the designed dual-polarized antenna fed by the tapered slot substrate-integrated coaxial line (SICL) balun were realized through the printed circuit board (PCB) in this paper. e designed dipoles of dual-polarized were exponentially tapered, which is like the Vivaldi antenna, whereas it is a dual-polarized dipole antenna
According to the structure and size, the designed dualpolarized dipole antenna fed by the SICL balun was fabricated. e PCB photo of the antenna prototype is shown in Figure 14. e simulated return losses and isolation degree between two ports are shown in Figures 15(a), 11(b), and 11(c), respectively
Summary
A Dual-Polarized Printed Antenna Based on a Tapered Slot SICL Balun for Airborne Radar Application. A tapered slot SICL balun is proposed, which can realize the impedance transformation from the microstrip line to the coplanar strip line (CPS). A printed dipole radiator is designed and is fed by the proposed SICL balun to achieve the impedance matching. E dual-polarized radiation mode is realized by employing two orthogonal printed dipoles. The CPS is bended to avoided the occlusion of two polarization ports and realize the direct assembling of two orthogonal printed circuits. The assembling method is advantageous to improve the port isolation degree and decrease the cross polarization level. E proposed dual-polarized antenna fed by the tapered slot SICL balun is suitable for the airborne radar application According to the results of simulation and experiments, the VSWR of each port is lower than 2, the isolation degree between two polarization ports is higher than 20 dB, and the cross polarization level at the boresight is lower than −20 dB at the operational frequency. e patterns of two ports are almost symmetric, and high radiation efficiency is obtained. e experimental results of the principle prototype verify the design schemes of the balun and the dual-polarized antenna. e proposed dual-polarized antenna fed by the tapered slot SICL balun is suitable for the airborne radar application
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
