A slot-coupled circularly polarized (CP) patch antenna with parallel-plate-mode (PPM) suppression for phased array systems is presented in this paper. The radiation performances of the CP array antenna with PPM suppression are improved using a substrate-integrated waveguide (SIW) cavity. In order to obtain a high isolation between the feeds of a feeding circuit, the cavity size and locations of the feeds are attentively designed. In addition, the performances of the proposed array antenna are thoroughly investigated. A comparative study between antennas (with and without the SIW cavity) is presented, involving both simulation and measurement. The proposed antenna with the SIW cavity has a 17-dB lower mutual-coupling level compared with the antennas without the SIW cavity; the individual antennas in the array, therefore, present more consistent and reliable characteristics in terms of impedance and radiation performances. The beam scanning performance of an 8× 8 phased CP array system is experimentally validated, and shown to exhibit the expected improvements in terms of gain, cross-polarization level, and axial ratio. The obtained results clearly demonstrate the advantages of the proposed antenna for CP phased array systems.
Bibliographical noteFunding Information:
Manuscript received September 1, 2016; revised March 29, 2017; accepted May 14, 2017. Date of publication June 5, 2017; date of current version August 2, 2017. This work was supported in part by the Low Observable Technology Research Center Program of Defense Acquisition Program Administration and in part by the Agency for Defense Development. (Corresponding author: Young Joong Yoon.) The authors are with the Department of Electrical and Electronic Engineering, Yonsei University, Seoul 120-749, South Korea (e-mail: firstname.lastname@example.org; email@example.com).
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All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering