Title :
LTCC multilayer based CP patch antenna surrounded by a soft-and-hard surface for GPS applications
Author :
Li, R.L. ; DeJean, G. ; Tentzeris, M.M. ; Laskar, J. ; Papapolymerou, J.
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
A circularly polarized (CP) patch antenna is designed for GPS applications. The soft-and-hard surface (SHS) is utilized for reducing the backside radiation. LTCC multilayer technology is employed to realize the SHS structure by surrounding the patch antenna with a number of rings of metal vias that can be easily fabricated in this process. It is found that the backlobe level can be reduced by more than 14 dB (front-to-back ratio > 20 dB) by using six rings of vias. The SHS-surrounded CP patch antenna has a broad coverage (directivity >0 dBi over /spl theta/=0-75/spl deg/), a low cross-polarized level (axial ratio <2 dB over the upper hemisphere), and a good input impedance match (return loss <-10 dB).
Keywords :
Global Positioning System; ceramic packaging; impedance matching; microstrip antennas; receiving antennas; GPS applications; LTCC multilayer technology; backlobe level; backside radiation; broad coverage; circularly polarized patch antenna; input impedance match; low cross-polarized level; metal vias; receiving antennas; soft-and-hard surface; stacked patch antenna; transmission-line method; Costs; Dielectric losses; Global Positioning System; Helical antennas; Impedance matching; Nonhomogeneous media; Optical reflection; Patch antennas; Receiving antennas; Space vehicles;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2003. IEEE
Conference_Location :
Columbus, OH, USA
Print_ISBN :
0-7803-7846-6
DOI :
10.1109/APS.2003.1219320
