RF Module Filter Layout for TDD Isolation and Reception Sensitivity
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Solution Overview
Problem
The existing radio-frequency modules experience reduced reception sensitivity due to degraded isolation between TDD transmission and reception signals, as seen in the related art.
Innovation Solution
A radio-frequency module configuration with separate TDD transmission and reception filters disposed on opposite sides of a mounting substrate, enhancing the isolation between transmission and reception paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If TDD transmission filter and TDD reception filter are disposed on the same side of the mounting substrate, then device complexity is reduced, but isolation between TDD transmission and reception signals is degraded
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement of filters to a three-dimensional arrangement by placing the TDD transmission filter and TDD reception filter on opposite sides of the mounting substrate. This spatial separation in the third dimension (thickness direction) achieves both goals: it maintains device compactness while significantly improving isolation between transmission and reception signals.
2Reliability
If TDD transmission filter and TDD reception filter are disposed on opposite sides of the mounting substrate, then isolation between TDD transmission and reception signals is improved, but device complexity increases
Solution Approach 1:
The patent utilizes the thickness direction of the mounting substrate to separate the TDD transmission filter and TDD reception filter into different spatial zones. This dimensional approach allows the filters to be positioned on opposite sides while maintaining a compact overall device structure, thereby improving isolation without proportionally increasing device complexity.
3Volume of moving object
If TDD transmission filter and TDD reception filter are placed close together, then device size is reduced, but reception sensitivity to TDD reception signals is degraded
Solution Approach 1:
The patent resolves the conflict between compact size and reception sensitivity by separating the TDD transmission filter and TDD reception filter in the thickness direction of the mounting substrate. This vertical separation creates sufficient isolation between the filters while maintaining a small overall device footprint, thereby preserving reception sensitivity without increasing device volume.
Data Source
AI summary
A radio-frequency module includes a mounting substrate, a power amplifier, a low-noise amplifier, at least one first transmission filter, and at least one first reception filter. The mounting substrate has a first main surface and a second main surface. The power amplifier is disposed on a side where the first main surface of the mounting substrate is located. The low-noise amplifier is disposed on a side where the second main surface of the mounting substrate is located. The first transmission filter allows a TDD transmission signal to pass therethrough. The first reception filter allows a TDD reception signal to pass therethrough. The first transmission filter is disposed on the side where the first main surface of the mounting substrate is located. The first reception filter is disposed on the side where the second main surface of the mounting substrate is located.