Multiband Demultiplexing Layout for Tx/Rx Isolation and Phase Matching
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Solution Overview
Problem
Existing demultiplexing apparatuses face challenges in supporting multiple communication bands, leading to degraded reception sensitivity and isolation between transmission and reception terminals due to increased signal paths, making it difficult to adjust phase correctly and suppress noise components.
Innovation Solution
A demultiplexing apparatus with an amplifier for multiple communication bands, featuring multiple signal paths and transmission-reception filters, where the gains of reception signals are smaller than those of transmission signals, and load impedance is positioned to be apart from the maximum gain phase by 45 degrees or more in a Smith chart, ensuring effective isolation and impedance matching across bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If common amplifiers are used to support multiband communication, then the number of communication bands supported is increased, but signal paths with degraded reception sensitivity occur
Solution Approach 1:
The patent segments the signal paths by providing separate impedance matching-phase adjustment circuits for each communication band. This allows independent phase adjustment for each band, preventing the degradation of reception sensitivity that occurs when multiple bands share a common adjustment circuit.
2Ease of operation
If impedance matching-phase adjustment circuits are provided for each communication band, then phase adjustment capability is improved, but device complexity increases making it difficult to adjust phase correctly
Solution Approach 1:
The patent combines multiple impedance matching-phase adjustment circuits into a single integrated circuit that can perform phase adjustment for multiple communication bands simultaneously. This reduces device complexity while maintaining the ability to adjust phase for each band independently.
3Adaptability or versatility
If multiple signal paths are provided for multiband communication, then communication versatility is improved, but isolation between transmission and reception terminals degrades
Solution Approach 1:
The patent introduces transmission-reception filters as intermediary components in each signal path. These filters selectively pass transmission or reception signals while blocking the opposite type, thereby maintaining isolation between transmission and reception terminals even when multiple signal paths are used for multiband communication.
Data Source
AI summary
A demultiplexing apparatus according to the present disclosure includes an amplifier that amplifies transmission signals in three or more communication bands having different frequency bands; multiple signal paths which are commonly provided for an output terminal of the amplifier and on which the signals in the corresponding communication bands are propagated; and multiple transmission-reception filters which are provided on the multiple signal paths, and each of which isolates a transmission signal and a reception signal of the corresponding communication band from each other. The gains of the amplifier in the frequency bands of multiple reception signals are smaller than the gains of the amplifier in the frequency bands of multiple transmission signals.