RF Module Layout With Temperature Compensation for Filter Isolation
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Solution Overview
Problem
The existing radio frequency modules face deterioration in isolation between acoustic wave filters and temperature sensors due to their mounting locations, which affects the performance and efficiency of the communication apparatus.
Innovation Solution
A radio frequency module design that includes a mount board with the acoustic wave filter on one principal surface and the temperature sensor on the opposite surface, along with a correction circuit that adjusts the pass band of the acoustic wave filter based on temperature measurements to maintain isolation and correct frequency shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the temperature sensor is mounted on or in the mount board on or in which the variable filter circuit is mounted, then the isolation between the variable filter circuit and the temperature sensor may deteriorate
Solution Approach 1:
The patent applies dimensional separation by mounting the temperature sensor and the acoustic wave filter on opposite surfaces of the mount board. This spatial arrangement in three-dimensional space eliminates signal interference while maintaining electrical connection functionality, resolving the contradiction between manufacturing ease and isolation reliability.
2Ease of manufacture
If low-cost acoustic wave filters with significant pass-band shifts are used, then cost is reduced, but frequency stability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the temperature sensor detects temperature changes and the correction circuit adjusts the pass band of the acoustic wave filter accordingly. This closed-loop control compensates for temperature-induced frequency shifts, maintaining frequency stability while using cost-effective components.
Solution Approach 2:
The correction circuit dynamically changes the electrical parameters (capacitance or inductance) of the acoustic wave filter based on temperature measurements. By adjusting these parameters in response to temperature variations, the system compensates for pass-band shifts and maintains frequency stability.
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 effectively suppresses the deterioration of isolation between the acoustic wave filter and temperature sensor, allowing for improved performance and reduced area requirements in communication apparatus, while enabling the use of low-cost acoustic wave filters with significant pass-band shifts.
Implementation Method 1
acoustic wave filter
Implementation Method 2
temperature sensor
Implementation Method 3
correction circuit corrects a pass band of the acoustic wave filter in accordance with a temperature measured by the temperature sensor
Data Source
AI summary
A radio frequency module includes a mount board, an acoustic wave filter, a temperature sensor, and a correction circuit. The mount board has a first principal surface and a second principal surface on opposite sides of the mount board. The acoustic wave filter is disposed on the first principal surface side of the mount board. The temperature sensor is disposed on the second principal surface side of the mount board. The correction circuit corrects a pass band of the acoustic wave filter in accordance with a temperature measured by the temperature sensor.