High-Frequency Switch Module With Matching Circuit for Low Pass Loss
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Solution Overview
Problem
Existing high frequency modules with two switch ICs face challenges in miniaturization and suffer from high pass loss, leading to increased reception sensitivity deterioration and decreased transmission power due to the complexity and number of switch circuits.
Innovation Solution
A high frequency module design that includes a switch circuit with a single set of terminals connected to filters and a matching circuit, where one terminal is connected to either the filter or ground, reducing the number of switch circuits and utilizing the matching circuit for impedance matching between antenna terminals and the switch circuit, thereby minimizing pass loss and enabling miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two switch ICs are used to connect antenna electrodes to filters, then the switching function is achieved, but the device size increases and pass loss increases
Solution Approach 1:
The patent combines two separate switch ICs into a single switch IC by integrating multiple switching functions within one device. The single switch IC includes multiple switch elements that can selectively connect antenna electrodes to different filters, replacing the need for two separate switch ICs and reducing overall module size while maintaining the required switching functionality.
Solution Approach 2:
The single switch IC is designed to perform multiple switching functions simultaneously. It can selectively connect different antenna electrodes to different filters through multiple switch elements, making one device universal enough to replace two specialized switch ICs, thereby reducing device count and module size.
2Adaptability or versatility
If two switch ICs are used in the high frequency module, then the switching capability is sufficient, but the pass loss increases due to multiple switch circuits
Solution Approach 1:
By merging two switch ICs into one, the patent reduces the total number of switch circuits in the signal path. The single switch IC with multiple switch elements provides the same switching capability with fewer discrete components, thereby reducing cumulative pass loss while maintaining adequate switching capability for connecting antenna electrodes to filters.
3Adaptability or versatility
If two switch ICs are included, then the switching function is complete, but the matching circuit size increases due to pass loss suppression requirements
Solution Approach 1:
The patent merges two switch ICs into a single switch IC, which reduces the overall pass loss in the system. This reduction in pass loss allows the matching circuit to be designed more compactly, as it does not need to compensate for the higher losses that would be present with two separate switch ICs, thereby reducing the matching circuit area.
Data Source
AI summary
A high frequency module includes a switch circuit, a first antenna terminal, a second antenna terminal, a matching circuit, a first filter, and a second filter. The switch circuit includes first to fourth terminals. The first antenna terminal is connected to the first terminal with a first signal path interposed therebetween. The second antenna terminal is connected to the second terminal with a second signal path interposed therebetween. The matching circuit is connected between the first signal path and the second signal path. The first filter is connected to the third terminal. The second filter is connected to the fourth terminal. When one terminal among the first terminal and the second terminal is connected to the third terminal or the fourth terminal, another terminal among the first terminal and the second terminal is connected to a ground.