Microwave-Rectifying Circuit with Phase-Shifting Branches
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Solution Overview
Problem
Existing microwave-rectifying circuits struggle to effectively suppress re-radiation of reflected waves from antennas in changing radio-wave environments, leading to power loss and interference with other radio waves, as they rely on fixed matching circuits that do not adapt to nonlinear rectifying circuit properties.
Innovation Solution
A microwave-rectifying circuit design featuring multiple branch lines with phase shifting sections that create phase differences of k×180/n° between branches, ensuring combined reflected waves cancel out at the branch point, thereby reducing re-radiation and maintaining high RF/DC conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed matching circuit is used in a microwave-rectifying circuit, then the circuit structure is simple, but the reflected wave suppression deteriorates when radio-wave environment changes
Solution Approach 1:
The invention divides the single rectifying path into multiple parallel branch lines (at least two branches), with each branch containing a rectifying circuit. This segmentation allows reflected waves from different branches to cancel each other through phase differences, solving the adaptability problem while maintaining reasonable structural complexity.
Solution Approach 2:
The invention introduces phase shifting sections that can adjust the phase of signals in different branch lines. By changing the phase parameter dynamically, the system adapts to varying radio-wave environments and maintains effective reflected wave suppression across different operating conditions.
2Adaptability or versatility
If multiple branch lines with phase shifting sections are used, then reflected wave suppression improves, but device complexity increases
Solution Approach 1:
The circuit is segmented into multiple identical or similar branch structures, each with a rectifying circuit and phase shifting section. This modular segmentation achieves complex functionality (reflected wave cancellation) through repeated simple units, balancing performance improvement with manageable complexity.
Solution Approach 2:
Multiple branch lines are merged at a common output node, combining the rectified signals while their reflected waves cancel each other through phase differences. This merging approach achieves reflected wave suppression without requiring completely separate processing paths for each function.
3Adaptability or versatility
If the number of branch lines is increased, then reflected wave cancellation effectiveness improves, but circuit complexity and power loss increase
Solution Approach 1:
The invention uses at least two branch lines, which is the minimum number required to achieve reflected wave cancellation through phase differences. This partial action approach provides sufficient cancellation effectiveness without the excessive power loss and complexity that would result from using many more branches.
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
The solution effectively suppresses re-radiation of microwaves from antennas and maintains high RF/DC conversion efficiency by canceling multiple-reflection components through phase shifting, even in dynamic radio-wave environments.
Implementation Method 1
phase shifting sections that are disposed upstream of the rectifying sections in at least (n−1) branch lines among the plurality of branch lines and shift a phase of the AC power in such a manner that, relative to the AC power that flows through one of the plurality of branch lines and arrives at a corresponding one of the rectifying sections, the AC power that flows through each of the other (n−1) branch lines and arrives at corresponding ones of the rectifying sections has a phase difference that differs by k×180/n°
Implementation Method 2
rectifying sections that are disposed in the plurality of branch lines respectively and rectify the AC power that flows through the plurality of branch lines
Data Source
AI summary
A microwave-rectifying circuit for rectifying AC power is equipped with: an input line into which AC power is inputted; multiple branch lines which branch off from the branching point on the output side of the input line into n lines; rectifiers which rectify the AC power flowing through the branch lines and are positioned in each of the multiple branch lines; and phase shift units which are provided upstream from the rectifier in at least n−1 branch lines among the multiple branch lines, and shift the phase of the AC power in a manner such that relative to the AC power which flows through one branch line and arrives at the corresponding rectifier, the AC power which flows through each of the other n−1 branch lines and arrives at the corresponding rectifier exhibits a phase difference of k×180/n°.