All-in-One Dual-Polarization Waveguide Receiver for Multichannel Wireless Systems

In this work, a monoblock hardware receiver solution for dual-polarization multichannel wireless systems is proposed and demonstrated for the first time. The receiver benefits from the use of a square waveguide scheme enabling dual-polarization features. Two orthogonalized polarizations, namely, horizontally and vertically polarized waves, can simultaneously be excited in a single-modular hardware receiver while maintaining reliable performances. Compared to conventional dual polarization receiver architectures with two separate hardware platforms, the proposed receiver is set to greatly reduce the circuit complexity, size, cost, and power consumption. Besides, due to the self-contained dual-input radio frequency (RF) channels, paralleled-multiband operation can also be realized. The core multiport circuit consists of integrated dual polarization components, namely, cruciform couplers, orthomode transducers (OMTs), and phase shifters. The operating mechanism of the receiver is studied and explained with a mathematical model. To validate the concept, an experimental prototype is developed, fabricated, and measured. Paralleled-multichannel transmission of various
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-quadratic-amplitude modulation (QAM) signals is successfully demodulated experimentally. It is found that the proposed waveguide receiver presents a viable candidate for future multistandard wireless systems.