[4] “W-band LTCC Circularly-Polarized Antenna Array with Mixed U-Type Substrate Integrated Waveguide and Ridge Gap Waveguide Feeding Networks,” IEEE Antennas and Wireless Propagation Letters, vol. 18, no. 11, pp. 2399-2403, 2019.

作者：Baolin Cao, Yongrong Shi, Wenjie Feng*

摘要：In this letter, a low-temperature co-fired ceramic (LTCC) substrate integrated 8 × 8 circularly polarized (CP) antenna array is proposed for the wideband and high-gain Wband antenna-in-package application. By introducing the planar L-probe together with the original coupling probe, the E-fields in the substrate-integrated-waveguide (SIW) cavity are changed,and additional E-field components with a 90°phase difference are produced. Then, a CP antenna array is obtained. To reduce the losses in the feeding network, the gap waveguide technology is utilized with the SIW technology, as a mixed feeding network. To validate the proposed CP antenna array design,an 8×8 CP antenna array is fabricated by the LTCC technology and measured. Measured results show that the LTCC CP antenna array obtains a gain of 22.3dBi,anditsaxial-ratio(AR)bandwidth is from 89 to 98.5GHz forAR < 3dB.Besides,good agreements of the radiation patterns between the simulations and measurements are achieved within the operational frequency range.