Loop-Type Directional Coupler with Electronic Directivity Tuning
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Solution Overview
Problem
Existing loop-type directional couplers face challenges in achieving wide-band optimization of directivity across multiple frequency ranges, requiring complex geometry re-optimization and precise positioning, which increases complexity and limits their effectiveness.
Innovation Solution
A loop-type directional coupler design featuring a half-loop antenna with connected networks and coupling-factor matching mechanisms that adjust signal magnitude and phase, allowing for identical capacitive and inductive coupling factors across different frequencies without altering the geometry, using power dividers, adders, subtractors, and coupling-factor matchers to optimize directivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If loop-type directional coupler geometry is re-optimized for each frequency range to achieve wide-band optimization of directivity, then directivity is improved, but device complexity increases due to requiring very accurate loop positioning unit
Solution Approach 1:
The patent changes the approach from geometric parameter optimization to electrical parameter adjustment. By using adjustable coupling factors (capacitive and inductive) instead of re-optimizing loop geometry for each frequency, the system achieves wide-band directivity optimization without complex positioning units. The coupling factors are adjusted to satisfy the condition Ki/Kc = Z01*Z02 across different frequencies, maintaining optimal directivity through electrical tuning rather than mechanical repositioning.
2Measurement precision
If loop positioning is made very accurate to enable directivity optimization across multiple frequency ranges, then directivity is improved, but ease of operation deteriorates
Solution Approach 1:
The patent replaces the mechanical positioning system with an electrical adjustment system. Instead of physically repositioning the loop antenna to optimize directivity at different frequencies, the system uses adjustable capacitive and inductive coupling factors that can be tuned electrically. This substitution eliminates the need for precise mechanical positioning while maintaining directivity optimization across wide frequency ranges, significantly improving ease of operation.
3Measurement precision
If coupling factors are matched electronically across different frequencies, then directivity is improved and complexity is reduced, but manufacturing precision requirements increase for the coupling-factor matcher
Solution Approach 1:
The patent implements a dynamic coupling-factor matching system that can adapt to different frequencies. The coupling-factor matcher includes adjustable capacitive and inductive elements that can be tuned to maintain the optimal Ki/Kc ratio across the frequency band. This dynamic adjustment capability allows the system to compensate for manufacturing tolerances and maintain high directivity without requiring extremely tight manufacturing precision, as the system can be calibrated after assembly.
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 design enables improved directivity and simplified configuration for each frequency range without changing the coupler's geometry, reducing complexity and enhancing performance across a wide band by matching coupling factors electronically.
Implementation Method 1
A loop-type directional coupler comprises a loop of guide which is positioned above or in a waveguide
Implementation Method 2
Inductive and/or capacitive coupling structures are employed to determine the scattering parameters
Implementation Method 3
Inductive and/or capacitive coupling structures are employed to determine the scattering parameters
Data Source
AI summary
A loop directional coupler having a first waveguide, particularly a hollow, planar, or a coaxial conductor in the form of a half loop antenna having first and second antenna branches for the contact-free extraction of an incoming signal “a” on a second waveguide and a returning signal “b” on the second waveguide. The first antenna branch is connected to a first input of a first network and the second antenna branch is connected to a second input of the first network, the first network having a first power splitter at the first input and a second power splitter at the second input for dividing the signal present at each antenna branch, the first network having a first adder adding the signals of the first and second power splitters to each other, and a first subtractor subtracting the signals of the first and second power splitters from each other.