A Ku-Band Planar Antenna Array for Mobile Satellite TV Reception With Linear Polarization

We present a high gain linearly polarized Ku-band planar array for mobile satellite TV reception. In contrast with previously presented three dimensional designs, the approach presented here results in a low profile planar array with a similar performance. The elevation scan is performed electronically, whereas the azimuth scan is done mechanically using an electric motor. The incident angle of the arriving satellite signal is generally large, varying between 25?? to 65?? depending on the location of the receiver, thereby creating a considerable off-axis scan loss. In order to alleviate this problem, and yet maintaining a planar design, the antenna array is designed to be consisting of subarrays with a fixed scanned beam at 45??. Therefore, the array of fixed-beam subarrays needs to be scanned ??20?? around their peak beam, which results in a higher combined gain/directivity. The proposed antenna demonstrates the minimum measured gain of 23.1 dBi throughout the scan range (for 65?? scan) with the peak gain of 26.5 dBi (for 32?? scan) at 12 GHz while occupying a circular aperture of 26 cm in diameter.