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A High-Gain Microstrip Patch Array Antenna Using a Superstrate Layer
Wonkyu Choi (phone:+ 82 42 860 4999, email: [email protected]), Cheol-Sik Pyo (email: [email protected]), and Jae-Ick Choi (email: [email protected]) are with Radio & Broadcasting Research Laboratory, ETRI, Daejeon, Korea.
Yong Heui Cho (email: [email protected]) is with Division of Information Communication and Radio Engineering, Mokwon University, Daejeon, Korea.
Abstract
A dielectric superstrate layer above a microstrip patch antenna has remarkable effects on its gain and resonant characteristics. This paper experimentally investigates the effect of a superstrate layer for high gain on microstrip patch antennas. We measured the gain of antennas with and without a superstrate and found that the gain of a single patch with a superstrate was enhanced by about 4 dBi over the one without a superstrate at 12 GHz. The impedance bandwidths of a single patch with and without a superstrate for VSWR < 2 were above 11%. The designed 2×8 array antenna using a superstrate had a high gain of over 22.5 dB and a wide impedance bandwidth of over 17%.
