A Compact Low-profile 5G Millimeter-wave Circularly Polarized Antenna Based on LTCC

- In this paper, a circularly polarized millimeter -wave L-shaped dipole antenna based on low temperature cofired ceramic (LTCC) technology is proposed, which realizes compact size and low -profile performance. The designed antenna consists of radiation patches and the grounded coplanar waveguide-substrate integrated waveguide (GCPW-SIW) feeding structure, which connects each other by two via holes. The radiation patches include a pair of L-shaped patches and four parasitic patches. The simulated results show that the proposed antenna operates from 26.5 to 29.5 GHz for |S-11| < -10 dB and AR < 3 dB with a peak gain of 6.7 dBic. The antenna element size is only 0.58 lambda(0)x0.58 lambda(0)x0.0562 lambda(0), where lambda(0) is free -space wavelength at the center frequency of 28 GHz. A sample of the antenna is fabricated and measured to verify the proposed design, which has a good agreement with the simulated ones, indicating that the antenna has potential applications for the fifth generation (5G) mm -Wave n257 (26.5 - 29.5 GHz) frequency band communications and satellite communication systems.