24-GHz LTCC Fractal Antenna Array SoP With Integrated Fresnel Lens

SoP concept.

F. A. Ghaffar, M. U. Khalid, K. N. Salama and A. Shamim

IEEE Antennas and Wireless Propagation Letters, vol. 10, pp. 705-708, 2011.

Abstract: A novel 24-GHz mixed low-temperature co-fired ceramic (LTCC) tape based system-on-package (SoP) is presented, which incorporates a fractal antenna array with an integrated grooved Fresnel lens. The four-element fractal array employs a relatively low dielectric constant substrate (CT707, ), whereas the lens has been realized on a high-dielectric-constant superstrate (CT765,  ). The two (substrate and super- strate) are integrated through four corner posts to realize the required air gap (focal distance). The fractal array alone provides a measured gain of 8.9 dBi. Simulations predict that integration of this array with the lens increases the gain by 6 dB. Measurements reveal that the design is susceptible to LTCC fabrication toler- ances. In addition to high gain, the SoP provides a bandwidth of 8%. The high performance and compact size (24  24  4.8 mm ) of the design makes it highly suitable for emerging wireless appli- cations such as automotive radar front end.