Waveguide Input Point Shift for Phase Orthogonality
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Solution Overview
Problem
Existing high-speed transmission technologies based on IQ quadrature axis require 90-degree phase shifters, leading to increased circuit complexity and cost, and result in reduced transfer rates when using BPSK modulation.
Innovation Solution
A transmission apparatus using a waveguide with input points shifted by a predetermined phase difference, eliminating the need for a 90-degree phase shifter and quadrature oscillator, allowing for precise IQ quadrature transmission without these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 90-degree phase shifter is used to orthogonalize I-axis and Q-axis, then IQ quadrature transmission can be achieved, but circuit complexity and cost increase
Solution Approach 1:
The patent removes the 90-degree phase shifter from the transmission path by extracting its function. Instead of using a dedicated phase-shifting component, the invention relies on the natural phase relationship between signals transmitted through different waveguide input points, thereby eliminating the complex phase-shifting circuitry while maintaining IQ quadrature transmission capability
Solution Approach 2:
The waveguide structure itself provides the necessary phase orthogonality through its geometric configuration. By positioning input points at specific locations on the waveguide cross-section, the structure naturally generates the 90-degree phase difference between I and Q signals without requiring external phase-shifting components, making the system self-sufficient
2Reliability
If a 90-degree phase shifter is used to orthogonalize I-axis and Q-axis, then IQ quadrature transmission can be achieved, but transmission cost increases
Solution Approach 1:
The patent eliminates the need for expensive 90-degree phase shifter components by extracting this function from the bill of materials. The waveguide structure with strategically positioned input points provides the phase orthogonality inherently, reducing component count and manufacturing cost while maintaining transmission accuracy
Solution Approach 2:
The invention changes the spatial parameters of the waveguide input points to achieve the desired phase relationship. By optimizing the position and orientation of input points on the waveguide cross-section, the system achieves 90-degree phase difference through geometric configuration rather than component-based phase shifting, thereby reducing cost
3Reliability
If BPSK modulation is used to maintain transmission stability, then transfer rate decreases, but transmission stability is maintained
Solution Approach 1:
The patent improves the signal quality parameters (phase orthogonality and amplitude balance) through optimized waveguide input point configuration. This enhancement of transmission quality enables the system to support higher-order modulation schemes like QPSK and QAM that offer higher transfer rates while maintaining stability, rather than being constrained to BPSK
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables high-speed transmission with reduced circuit scale and cost, while maintaining precision for high-order modulation schemes like multilevel modulation.
Implementation Method 1
a first input point and a second input point for inputting a first transmission signal and a second transmission signal, respectively, into the waveguide are shifted from each other by a distance that provides a predetermined phase difference between the first transmission signal and the second transmission signal
Data Source
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AI summary
Disclosed herein is a transmission apparatus including a first transmission block configured to modulate a carrier-wave signal having a predetermined frequency on the basis of a first input signal, thereby outputting a first transmission signal; and a second transmission block configured to modulate a carrier-wave signal having a predetermined frequency on the basis of a second input signal, thereby outputting a second transmission signal; wherein a first input point for inputting the first transmission signal outputted from the first transmission block into a waveguide and a second input point for inputting the second transmission signal outputted from the second transmission block into the waveguide are shifted by a distance for providing a predetermined phase difference between the first transmission signal and the second transmission signal.