Multi-Band Transmit/Receive Module Without Switch Insertion Loss
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Solution Overview
Problem
As the number of frequency bands covered by a single power amplifier increases, the switch element requires more contacts, leading to higher insertion loss and a tradeoff with isolation characteristics, making it difficult to regulate insertion loss while maintaining high isolation.
Innovation Solution
The use of multiple duplexers with separate transmit and receive filters, connected directly to a power amplifier without a switch, reduces insertion loss by eliminating switch-induced losses and allows for impedance matching to maintain high isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switch element is used to select and supply signals from multiple bands to corresponding duplexers, then the system can support multiple frequency bands, but the insertion loss increases due to the contacts of the switch element
Solution Approach 1:
The patent extracts and removes the switch element from the signal path between the power amplifier and duplexers. By eliminating the switch element entirely, the insertion loss caused by switch contacts is removed, while multi-band support is maintained through direct connection of the power amplifier output to multiple duplexers for different frequency bands.
Solution Approach 2:
The patent segments the signal path by providing separate direct connections from the power amplifier to each duplexer for different frequency bands. This segmentation allows each band to have its own dedicated path without sharing common switch contacts, thereby reducing insertion loss while maintaining the ability to support multiple bands simultaneously.
2Adaptability or versatility
If more contacts are added to the switch element to cover more bands, then the multi-band capability is improved, but the isolation characteristics between contacts deteriorate
Solution Approach 1:
The patent removes the switch element that causes isolation problems between contacts. By extracting the switch from the system, the isolation characteristics between different band paths are improved, as each band now has its own dedicated connection path from the power amplifier without interference from other bands through shared switch contacts.
Data Source
AI summary
A transmit/receive module includes plural duplexers, a power amplifier, and a sending transmission line. The plural duplexers operate in bands different from each other and each includes a transmit filter and a receive filter. The power amplifier amplifies signals of pass bands of the plural transmit filters and outputs the amplified signals. The sending transmission line is connected to the plural transmit filters. The signals of the pass bands of the plural transmit filters output from the power amplifier are transmitted through the sending transmission line.