RF Module Impedance Matching Switch
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Solution Overview
Problem
The high cost and performance compromise of radio frequency transistors, along with electromagnetic disturbances from multiple baluns, hinder the efficient operation of radio frequency modules with multiple communication circuits connected to a common access point.
Innovation Solution
A radio frequency module with a common access point that uses a switch to selectively activate or deactivate impedance matching circuits connected to baluns, allowing either radio frequency communication circuit to be used without a high-performance radio frequency transistor, by varying impedance values between high and low states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a radio frequency transistor is used to selectively connect the common access point to radio frequency communication circuits, then the switching function is achieved, but the cost increases and performance is compromised due to noise and interference
Solution Approach 1:
The patent removes the radio frequency transistor from the signal path entirely. Instead of using a transistor to switch between RF circuits, the invention uses RF switches that connect circuits through baluns, extracting the problematic transistor component from the RF signal path while maintaining the switching function.
Solution Approach 2:
The patent introduces baluns as intermediary components between the RF switches and the common access point. These baluns serve as mediators that provide impedance transformation and isolation, allowing circuit switching without direct transistor connection to the RF signal path, thereby reducing noise and interference.
2Adaptability or versatility
If multiple baluns are connected to the common access point to support multiple radio frequency communication circuits, then circuit versatility is improved, but electromagnetic disturbances increase and performance degrades
Solution Approach 1:
The patent implements dynamic switching between different balun configurations using RF switches. Instead of having multiple baluns permanently connected to the common access point, the system dynamically activates only the required balun at any given time, reducing electromagnetic disturbances while maintaining versatility.
Solution Approach 2:
The patent uses RF switches to preliminarily select and isolate the required balun before RF signal transmission begins. This preliminary action ensures that only one balun is active at a time, preventing electromagnetic interference between multiple baluns while maintaining the capability to support multiple circuits.
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
Enables high-performance operation of radio frequency modules with multiple communication circuits without the need for expensive transistors, reducing electromagnetic disturbances and improving overall performance.
Implementation Method 1
a first balun coupled to the first radio frequency communication circuit by first ports wherebetween a first impedance varying between a high value and a low value is established
Data Source
AI summary
A radio frequency module with common access point (1) comprising a common access point (2) adapted to send and receive radio frequency signals, said common access point (2) having a common access point impedance, a first radio frequency communication circuit (6) and a second radio frequency communication circuit (8), a first balun (10) coupled to the first radio frequency communication circuit (6) by first ports (11a, 11b) wherebetween a first impedance (Z1) varying between a high value and a low value is established, and a second balun (20) coupled to the second radio frequency communication circuit (8) by second ports (21a, 21b) wherebetween a second impedance (Z2) varying between a high value and a low value is established, wherein the radio frequency module with common access point (1) comprises an impedance matching circuit (18) connected between the first ports (11a, 11b) in parallel with the first balun (10), and a switch (16) configured to open and close the impedance matching circuit (18).