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<p>This wireless distributed digital phase array (WDDPA) has been proposed for several  military applications in the sensor and communication areas. The idea of WDDPA is to  use a wireless network for transmitting and receiving data between a master controller  and modules in an active phased array instead of using a conventional wired  beamforming network. The WDDPA provides several advantages over conventional  networks such as battlefield survivability, digital architecture and flexibility of system  installation on platforms.  A phase synchronization circuit has been developed in the WDDPA application,  allowing coherent processing of the data from all elements. There are limitations  encountered due to non-ideal hardware, and the performance of the circuit is limited. One  of the major problems is the leakage from the circulator. The leakage disrupts the power  distributed from the T/R modules. A cancellation circuit has been developed to cancel out  the leakage. The performance of the cancellation circuit was investigated by a series of  simulations using Agilent ADS (Agilent Advanced Design System), and hardware tests  were conducted to characterize the behavior of the circuit. The performance is limited by  the accuracy of the attenuator and phase shifter in the cancelation branch. A method for  cancelling the residual leakage signal digitally is discussed.
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<br>Subjects: Electrical engineering; Electronics</div>
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Cheng, Wei-Han</div>
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