Abstract
We present an optically fed tightly coupled array (TCA) antenna capable of
ultrawideband operation ranging from 4–12 GHz. Full-wave simulations have been performed
to yield an optimal array design incorporating all required components into the
photodiode-integrated antenna model. Various techniques, such as inductance peaking and
resistance matching, are employed to overcome inherent constraints in conventional TCAs,
thereby improving the operational bandwidth. To demonstrate the concept, an 8 × 8 phased
array transmitter, containing four active radiating elements, has been fabricated and
integrated on a multilayer high-frequency substrate. The system performance has been
evaluated by feeding this array with an optical feed network. The experiment
demonstrates that the system possesses ultrawide bandwidth over the frequency range from
4–12 GHz, and wide beam-steering capability up to 40° from the broadside. Electrically
controlled optical beam steering is demonstrated and characterized, and far-fields are
measured, and compared with simulation results, showing good agreement.
© 2015 IEEE
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