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Whereas traditional beamforming concepts for phased arrays transmit the same signal content in all directions, shaped in magnitude by the array factor and element patterns, a phased array system employing directional modulation presented here forms a signal in a desired direction through spatial combination using a solution of randomized phase weights applied across the array. In a radar system application,...
A small three element linear planar array designed to have high isolation between elements for Simultaneous Transmit And Receive (STAR) is demonstrated. This high isolation is achieved through use of tunable resonators that control the near fields of the array without detrimentally affecting the radiated fields. These resonators, which are placed between the patch antenna elements of the array, provide...
This paper demonstrates the concept of a field-programmable filter array which can be configured in the field after fabrication. The proposed array is composed of tunable resonators and can have multiple functionalities by rerouting signals from input ports to output ports. Signal rerouting can be achieved by controlling the inter-resonator coupling with a wide tuning ratio of coupling coefficients...
Concurrent transmit and receive with multiple antennas is demonstrated through near field cancellation. Full-duplex operation is possible through cancellation of the transmit signal at the receiver as much as 50dB. By exploiting symmetry in an array of antennas, a centrally located receiver is able to operate without saturation in the presence of high power transmit signals. The transmitters are able...
When an active phased array is used for polarimetric radar applications, the system must be calibrated to reflect the fact that polarization of the transmitted and received fields is dependent on the scan angle. This paper discusses the challenges of polarimetric phased array calibration, and demonstrates these techniques using a linear array of eight S-band dual-polarized antennas connected to an...
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