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We presents a broadband, 1-bit reconfigurable transmit-reflect-array (TRA) design that is capable of switching between transmit-array and reflect-array modes to provide bi-directional beam steering. The proposed TRA unit cell uses two positive-intrinsic-negative (PIN) diodes to switch between four operating states to realize 1-bit phase resolution and co-polarized radiation in both the reflection and transmission modes. To provide the same polarization for the backward and forward radiation, the unit cell acts as two cascaded 90^ -polarization rotators in the transmission mode and as a non-polarization-rotation reflector in the reflection mode. Simulation results for the TRA unit cell designed for operation at C-band show an operating bandwidth of 23% for 1-bit transmission and reflection phase shifts. The proposed unit cell was used to construct a TRA consisting of 18 18 elements. Full-wave simulation results for the TRA operation at 5 GHz predict a 60^ scan range and a peak aperture efficiency of 18. 5% for the reflect-array mode as well as a 45^ scan range and a peak aperture efficiency of 12. 4% for the transmit-array mode.
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