High-Frequency Module Directional Coupler Directivity Switching
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Solution Overview
Problem
High-frequency circuits in multi-mode, multi-band communication apparatuses face challenges in accurately detecting transmission signals across various frequency bands due to mismatching issues, which affect the isolation characteristics and detection accuracy of directional couplers.
Innovation Solution
A high-frequency module with a directional coupler and a switch unit that adjusts the directivity of coupled output by using termination resistors and inductors to improve isolation characteristics, allowing for precise detection of high-frequency signals across different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a directional coupler is used to detect high-frequency signals in multi-mode, multi-band communication apparatuses, then signal detection capability is provided, but isolation characteristics deteriorate due to mismatching across various frequency bands
Solution Approach 1:
The patent applies dynamics by making the termination resistance value changeable according to the frequency band. A selection unit selects different termination resistance values based on the operating frequency band, allowing the directional coupler to adapt its characteristics dynamically. This resolves the contradiction by optimizing both detection accuracy and isolation characteristics for each specific frequency band rather than using a fixed termination resistance.
Solution Approach 2:
The patent changes the termination resistance parameter according to the frequency band. By adjusting the termination resistance value to match different frequency bands (e.g., different values for LTE, WiMAX, WiFi bands), the directional coupler maintains optimal performance across multiple bands. This parameter adaptation resolves the mismatching issue that causes deterioration in isolation characteristics.
2Ease of manufacture
If fixed termination resistance is used in directional coupler, then circuit simplicity is maintained, but detection accuracy deteriorates across multiple frequency bands
Solution Approach 1:
The patent introduces dynamic selection of termination resistance values through a selection unit that chooses appropriate resistance values based on the active frequency band. This dynamic approach maintains circuit simplicity while improving detection accuracy across multiple bands, as the circuit structure remains relatively simple but adapts its parameters dynamically.
Solution Approach 2:
The patent changes the termination resistance parameter based on frequency band requirements. By providing multiple termination resistance values and selecting the appropriate one for each band, the system achieves high detection accuracy across diverse frequency bands without significantly complicating the overall circuit design.
3Adaptability or versatility
If directional coupler operates across multiple frequency bands, then communication versatility is improved, but mismatching increases causing deterioration in isolation characteristics
Solution Approach 1:
The patent makes the termination resistance dynamic and adaptable to different frequency bands through a selection unit. This allows the directional coupler to maintain good isolation characteristics across multiple frequency bands by optimizing the termination resistance for each band, thus preserving reliability while achieving versatility.
Solution Approach 2:
The patent adjusts the termination resistance parameter according to the operating frequency band. By providing different termination resistance values for different bands (e.g., 50Ω for some bands, other values for others), the system eliminates mismatching issues and maintains consistent isolation characteristics across all supported frequency bands.
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 enhances the detection accuracy of high-frequency signals by improving isolation characteristics, reducing mismatching, and enabling effective communication across multiple frequency bands.
Implementation Method 1
a first sub line which is electromagnetically coupled to the first main line
Data Source
AI summary
A high-frequency module includes a directivity switching switch unit that switches an end portion of a first sub line, which is connected to an output terminal, and first and second resistor switching switch units that switch first and second termination resistors which are connected to the first sub line. The directivity of coupled output in the first sub line of a first directional coupler is able to be switched and detection accuracy of a high-frequency signal is able to be improved by improving isolation characteristics of the first directional coupler to improve the directivity.