Communication Module Impedance Matching for Insertion Loss Reduction
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Solution Overview
Problem
In communication devices, existing technologies face challenges in impedance matching when using duplexers with different passbands, leading to increased insertion loss and difficulty in supporting multiple frequency bands simultaneously.
Innovation Solution
A module is designed with a diplexer, switches, and impedance portions to selectively connect ports, ensuring impedance matching across different frequency bands by using impedance portions with 50Ω impedance and reactance, optimizing duplexer performance for both Low Band (LB) and High Band (HB) signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the switch is turned off to block a second signal, then the second signal is blocked, but the impedance deviates from 50Ω and insertion loss increases
Solution Approach 1:
An impedance adjustment circuit is introduced as an intermediary component between the switch and the diplexer. This circuit mediates the impedance mismatch caused by the switch being in the off state, transforming the high impedance state into a matched 50Ω impedance state, thereby reducing insertion loss while maintaining signal blocking functionality
Solution Approach 2:
The impedance adjustment circuit dynamically changes the impedance parameter of the switch output. When the switch is off, the circuit transforms the high impedance state into a 50Ω matched state, allowing the system to adapt impedance parameters based on operational conditions to minimize energy loss
2Object-generated harmful factors
If the first end of the switch is grounded to enhance switch off state, then the blocking performance is improved, but the impedance deviates from 50Ω and it is difficult to match the diplexer impedance
Solution Approach 1:
The impedance adjustment circuit serves as a mediator between the grounded switch and the diplexer. It transforms the low impedance state (caused by grounding) into a 50Ω matched state, enabling the system to maintain both the enhanced blocking performance from grounding and the impedance matching requirement for optimal signal transmission
Solution Approach 2:
The circuit changes the impedance parameter from the low state (when switch is grounded) to the 50Ω matched state. This parameter transformation allows the system to achieve both grounding benefits (signal blocking) and impedance matching (signal transmission efficiency) simultaneously
3Reliability
If two duplexers are coupled to the diplexer for simultaneous transmission and reception, then frequency characteristics are improved, but the device complexity increases
Solution Approach 1:
The impedance adjustment circuit is designed with multi-functionality, serving both impedance matching and signal blocking functions. By making this single circuit perform multiple functions, the patent reduces the need for additional separate components, thereby managing device complexity while maintaining reliable frequency characteristics
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
The solution reduces insertion loss and enhances frequency characteristics by maintaining impedance matching, even when only one signal is transmitted or received, and improves suppression band attenuation, optimizing duplexer performance for simultaneous and non-simultaneous signal operations.
Implementation Method 1
a first impedance portion that is coupled to another port of the first ports... matching impedance... impedance matching... The impedance deviates from, for example, 50Ω, and thus it is difficult to match the impedance of the diplexer having a port of which the impedance is designed to be 50Ω
Data Source
AI summary
A module includes: a diplexer that includes a first terminal, a second terminal, and a common terminal coupled to an antenna; a first switch that is coupled to the first terminal, includes first ports, and selects, from the first ports, and connects one port to the diplexer; a first duplexer that is coupled to at least one of the first ports; a second duplexer that is coupled to the second terminal and has a passband different from a passband of the first duplexer; and a first impedance portion that is coupled to another port of the first ports.