Radio Frequency Module Switching for Spurious Wave Dispersion
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Solution Overview
Problem
Conventional radio frequency modules struggle with improving spurious wave attenuation and achieving size reduction, particularly when operating in non-carrier aggregation modes.
Innovation Solution
The proposed radio frequency module incorporates a switchable configuration with two communication paths, each equipped with a filter. The first filter has a pass band including two communication bands, while the second filter has a pass band that overlaps with one of the communication bands. This configuration allows for the dispersion of spurious waves across both communication paths, enhancing attenuation and enabling size reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the first filter only allows signals in the first frequency band to pass, then the filter design is simple, but the attenuation of spurious waves in the first frequency band is insufficient when other frequency bands are included in the pass band
Solution Approach 1:
The first filter is divided into multiple filter sections, each responsible for filtering specific frequency bands. This segmentation allows the filter to maintain simplicity in individual sections while achieving comprehensive spurious wave attenuation across multiple frequency bands when combined
Solution Approach 2:
The first filter is designed to handle multiple frequency bands (first frequency band and second frequency band) simultaneously, making it multi-functional. This allows the filter to attenuate spurious waves across different bands without requiring separate dedicated filters for each band
2Reliability
If a dedicated path with impedance load circuit is provided, then impedance characteristics are secured, but the module size increases
Solution Approach 1:
The communication path for the second frequency band is merged with the impedance securing function. The second filter and its associated path serve dual purposes: transmitting second frequency band signals and providing impedance loading for the first frequency band, eliminating the need for a separate dedicated impedance path
Solution Approach 2:
The second communication path and second filter are designed to perform multiple functions: they transmit signals in the second frequency band while simultaneously serving as an impedance load for the first frequency band during non-CA operation, reducing overall module complexity and size
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 solution effectively improves spurious wave attenuation and reduces the size of the radio frequency module by utilizing the second communication path for both signal transmission and spurious wave dispersion.
Implementation Method 1
The first filter (7) is provided in the first communication path (L1) and has a pass band including a first communication band and a second communication band
Implementation Method 2
The second filter (8) is provided in the second communication path (L2) and has a pass band including a third communication band
Implementation Method 3
The switch (6) is configured to be switchable between first connection and second connection. In the first connection, the common terminal is connected to the first selection terminal, and the common terminal is not connected to the second selection terminal. In the second connection, the common terminal is connected to the first selection terminal, and the common terminal is connected to the second selection terminal.
Data Source
AI summary
A radio frequency module includes a switch, first and second filters. The switch includes a common terminal and two selection terminals. A first communication path is connected to a first selection terminal. A second communication path is connected to a second selection terminal. The first filter is in the first communication path and includes first and second communication bands. The second filter is in the second communication path and includes third and fourth communication bands. At least a part of the third communication band overlaps the first communication band, but not the second communication band. The switch is switchable between first and second connections. In the first connection, the common terminal is connected to the first selection terminal. In the second connection, the common terminal is connected to the first selection terminal, and the common terminal is connected to the second the selection terminal.