Stacked Microstrip Antenna with High Gain for Wireless Camera System

Abstract

A microstrip antenna with a small size and light weight is useful for wireless cameras. The antenna used for wireless cameras is required to have a gain of 10-12 dBi. To get a gain of 10-12 dBi, the microstrip antenna is usually constructed in a planar array. However, it can be also made by arraying a parasitic element in the radiating direction over the radiator. On the other hand, the impedance bandwidth of the antenna increases by locating a parasitic element over the radiator. In this papar, we propose a microstrip antenna composed of three elements : the radiator, the first parasitic element to widen the bandwidth of impedance and the second parasitic element to increase the gain. The characteristics of this stacked antenna are investigated experimentally and the utility for a wireless camera system is discussed.