Design of Dual Band Antenna

Electronics and Telecommunications Engineering

In today’s communication system antennas are the most important components for creating communication link. Microstrip antennas are used for mobile application and othercommunication application because of their light weight and low power handling capacity. The modern mobile communication system requires high gain, wide bandwidth and minimal size antennas that are capable of providing better performance over a wide range of frequency spectrum. This requirement leads to the design of microstrip patch antenna. This paper proposes the design of 2-Element microstrip patch antenna array which uses Quarter Wave Transformers (corporate feed) technique for excitation. Low dielectric constant substrates are generally preferred for maximum radiation. Thus it prefers FR4 as a dielectric substrate. Desired patch antenna design is initially simulated by using high frequency simulation software CAD-FEKO and patch antenna is designed as per requirement. Antenna dimensions such as Length (L),Width(W), and substrate dielectric constant and parameters like Return Loss, Gain and impedance are calculated using CAD-FEKO. The antenna has been design to the range 8-12GHz. Hence this antenna is highly suitable for X-band applications. For long distance communication we cannot use single element microstrip patch antenna. So for that purpose we are using microstrip patch array antenna. In this paper array stands for geometrical and electrical arrangements of patch elements. As number of patch elements goes on increasing, the performance is improved. A wide operating bandwidth for a single-layer corporate fed rectangular microstrip patch antenna can be obtained by cutting a U-shaped slot on the patch [12].

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