Lattice Array Antenna OAM Multiplexing via Phase Shift Weighting
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Solution Overview
Problem
Existing array antennas with lattice configurations are unable to perform communication using wireless signals with multiple Orbital Angular Momentum (OAM) propagation modes, as they require dedicated antennas for each mode.
Innovation Solution
A transmission and reception system that utilizes a 4x4 phased array antenna with lattice configuration, employing demultiplexers, transmitters, receivers, and multiplexers to manage and process signals for 0-order, +1-order, and 2-order OAM modes, allowing for multiplexing of signals across orthogonal channels by applying specific phase shifts and weightings to antenna elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dedicated antenna is used for each OAM mode, then communication using multiple OAM propagation modes is achieved, but device complexity and hardware requirements increase
Solution Approach 1:
The patent applies universality by enabling a single lattice array antenna to perform multiple functions - transmitting and receiving multiple different OAM modes (0-order, +1-order, -1-order, etc.) simultaneously. The antenna structure itself is designed to be multi-functional rather than requiring separate dedicated antennas for each mode, thereby reducing device complexity while maintaining adaptability
2Ease of manufacture
If a lattice array antenna configuration is used, then compatibility with existing MIMO hardware is achieved, but the ability to perform OAM mode communication is lost
Solution Approach 1:
The patent applies parameter changes by modifying the phase and amplitude parameters of the signals fed to each antenna element in the lattice array. By applying specific phase shifts (e.g., linear phase gradients across the array) and amplitude weightings, the existing lattice antenna structure can generate and receive multiple OAM modes without changing its physical configuration, thus maintaining hardware compatibility while enabling OAM functionality
3Productivity
If multiple orthogonal channels are multiplexed, then communication capacity is enhanced, but signal processing complexity increases
Solution Approach 1:
The patent applies feedback by implementing receive beamforming that uses the known transmit beamforming parameters to construct the appropriate receive weights. The receiver uses feedback from the channel state and the known transmit signal structure to separately detect multiple OAM modes, thereby managing signal processing complexity while maintaining high communication capacity through multiplexing
Data Source
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AI summary
In an array antenna in which antenna elements are disposed in a lattice, signals are multiplexed over a plurality of orthogonal channels using wireless signals having a plurality of OAM propagation modes. OAM multiplex transmission transceiver device 10 transmits multiplexed signals. The multiplexed signals are obtained by multiplexing signals of N systems corresponding to N (N is an integer equal to or larger than 2) Orbital Angular Momentum (OAM) propagation modes. OAM multiplex transmission transceiver device (10) includes array antenna (100) that includes M (M is an integer equal to or larger than 2) antenna elements disposed in a lattice on a plane when viewed from the plane, and a transmitter (12) that multiplies signals obtained by branching each of the signals of N systems into M signals by weighting coefficients of phase shift angles based on angles of the respective M antenna elements with respect to a reference axis passing through a reference point viewed from the reference point on the plane according to the OAM propagation modes, multiplexes the signals of N systems multiplied by the weighting coefficients of the phase shift angles, and transmits signals obtained by the multiplexing from the M antenna elements.