Topic > A new parasitic patch array with wide beam steering...

A reconfigurable parasitic patch array antenna with five-element beam steering is proposed in this letter. For the patch-type antenna with parasitic array technique, the achievable beam scanning range is very limited in the range -30° to +30° from the broadside. Increasing the number of parasitic elements does not provide a significant improvement in beam scanning where only an additional 3°-5° is achieved. Therefore, this research proposed the integration of additional parasitic elements with a new ground plane reduction approach which ultimately improved the steering angle by approximately 43%. Five measured steering beam patterns of -50°, -30°, 0°, +30°, +50° were successfully obtained with the respective switching conditions. Introduction: Patch antenna reconfigurable beam steering has gained considerable interest due to its compactness, simple design and low cost [1,2]. Various techniques have been developed to perform beamsteering with patch antennas [2-4]. In this work, further investigations are conducted in the design of a linear-switched parasitic array wide-beam antenna. The improved beam tilt angle is achieved with the new introduction of the ground plane reduction technique on the parasitic antenna. The fabricated antenna is capable of reconfiguring the radiation pattern in five different directions with the optimized switching position on the parasitic elements. Beam steering is achieved at the operating frequency of 5.8 GHz with little influence on other antenna characteristics such as gain and S11. For simplicity and to demonstrate the concept, the representation of a short circuit pin is considered as the artificial switch at the specified switching positions. The presence and absence of the short-circuit pin are considered as ON and OFF states respectively. Antenna Design: Fig.1 illustrates the physical structure of the beam steering parasitic