Abstract
A wide-bandwidth electronic scanning antenna (ESA), based on a Rotman lens beam-former, has been developed for shared aperture applications. The key feature of the Rotman lens is that it allows multiple simultaneous beams to be transmitted in different directions and at different frequencies. Since the Rotman lens is a true time-delay element, it is inherently wide-bandwidth and other components of the antenna were designed to support a bandwidth of 8 to 18 GHz. In the ESA, the input signal to the Rotman lens is controlled by a PIN diode beamswitching network, and the outputs are fed to a two-dimensional array of Vivaldi notches. The ESA performance is characterized, and the results is presented.
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