The Miniaturized Microstrip Antenna with `L' type Plates

In this paper, the miniaturized linear and circular polarization microstrip antennas are designed and fabricated at the resonant frequency of 1.575 GHz. To miniaturize the microstrip patch antenna (MPA), the 'L' type plates are attached under the rectangular microstrip patch. In case of the linear polarization, the size of the microstrip antenna attached the 14 plates is reduced to 67.9% (47 mm times 47 mm) compared with general MPA (83 mm times 83 mm). The return loss, -10 dB bandwidth and gain are -34.4 dB, 49 MHz (3.1%)and 1.19 dBd. And the radiation pattern is broad through the size reduction of the patch. Also in case of the circular polarization, the size of the microstrip antenna with 13 plates is reduced to 54.6% (53 mm times 54 mm) compared with the general MPA (76 mm times 83 mm). The gain and axial ratio are 1.36 dBd and 1.37 dB at 1.575 GHz, the 2 dB axial ratio bandwidth is 14 MHz (0.8%)