Simultaneous transmit and receive with digital phased arrays

Techniques for Achieving High Isolation in RF Domain for Simultaneous Transmit and Receive

“…Techniques have also been studied for increasing isolation between antenna array elements. Examples include employing a linear array for digital beamforming [33] to reduce Tx/Rx coupling in across 125 MHz, a 2×2 patch antenna array [34] using narrowband filters provides 30 dB isolation across a 110MHz bandwidth. However, previous implementations of inter element coupling are narrowbands with limited scanning efficiency.…”

Performance Simulation and Optimization of a Simultaneous Transmit and Receive Phased Antenna Array Using Adaptive Beamforming and Genetic Algorithm Techniques

“…The development of simultaneous transmit and receive capabilities is on the cutting-edge of research in phased array technology [1,2,3]. The large disparity in power between the transmitted and received signals in antenna systems has traditionally prevented operation in a simultaneous mode.…”

“…Efforts originated at Massachusetts Institute of Technology Lincoln Laboratories (MITLL) in the RF Technology Group to enable simultaneous transmit and receive operations in an antenna array through sophisticated beamforming and filtering techniques [1]. Specifically, array hardware was developed such that any antenna could be configured as either a transmit or receive element, and the receive hardware acted as a reference measurement channel when the antenna was in a transmitting mode [1]. The work derived the optimal transmit and receive beamformers and self-interference cancellation filter to maximize transmit and receive isolation in an array intended for communication operations [1].…”

“…Specifically, array hardware was developed such that any antenna could be configured as either a transmit or receive element, and the receive hardware acted as a reference measurement channel when the antenna was in a transmitting mode [1]. The work derived the optimal transmit and receive beamformers and self-interference cancellation filter to maximize transmit and receive isolation in an array intended for communication operations [1]. Furthermore, it outlined a metric to characterize the total performance of these beamforming and filtering techniques [1].…”

“…The work derived the optimal transmit and receive beamformers and self-interference cancellation filter to maximize transmit and receive isolation in an array intended for communication operations [1]. Furthermore, it outlined a metric to characterize the total performance of these beamforming and filtering techniques [1]. Finally it demonstrated the success of these techniques by modeling a representative array in Ansys HFSS [1].…”