Active Wilkinson Combiner With RC Isolation and Low Insertion Loss
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Solution Overview
Problem
Existing Wilkinson combiners, both passive and active, face challenges in achieving optimal impedance matching and isolation between input ports, particularly suffering from insertion loss and limited port isolation compared to passive component-based designs.
Innovation Solution
An active Wilkinson combiner circuit incorporating a resistive-capacitive (RC) network and a coupled inductor with mutual inductance, providing electrical isolation and impedance matching between input ports, and an amplifier for signal amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive devices are used to implement Wilkinson combiner, then good isolation between combining ports is achieved, but insertion loss occurs and device complexity increases
Solution Approach 1:
An RC isolation network is introduced as an intermediary component between the two input ports to provide electrical isolation. The network includes a resistor and capacitor connected in parallel between the ports, which blocks signal leakage while maintaining low insertion loss through the active amplifier path
Solution Approach 2:
The invention transitions from passive to active implementation by introducing an amplifier, changing the operating parameters from purely resistive/divisive to amplifying. This allows the combiner to actively compensate for losses and provide isolation without the energy dissipation inherent in passive resistive networks
2Reliability
If passive Wilkinson combiner is used, then port isolation is achieved, but device complexity and component count increase
Solution Approach 1:
The isolation function and signal combining function are merged into a unified active circuit architecture. The RC network provides isolation while the amplifier simultaneously combines and amplifies the signals, eliminating the need for separate passive isolation components and reducing overall circuit complexity
Solution Approach 2:
The amplifier serves multiple functions: it combines signals from both ports, provides gain to compensate for losses, and works in conjunction with the RC network to enable isolation. This multi-functionality reduces the number of dedicated components needed compared to purely passive implementations
3Power
If active Wilkinson combiner with multiple components is used, then signal amplification is achieved, but isolation between ports deteriorates
Solution Approach 1:
The circuit is segmented into distinct functional blocks: the RC isolation network handles port isolation separately from the amplifier that handles signal combination and amplification. This segmentation allows each component to optimize its specific function without interfering with the other, maintaining isolation performance while providing gain
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 proposed solution achieves improved impedance matching and isolation between input ports, reducing insertion loss and enhancing port isolation compared to passive component-based designs, while allowing for compact and efficient signal combination and distribution.
Implementation Method 1
The coupled inductor used in various embodiments includes first and second portions, the first portion being coupled between the amplifier input and the first input port, while the second portion is coupled between the amplifier input and the second input port. When operating, the first and second portions have a mutual inductance.
Implementation Method 2
One embodiment of the RC network includes a resistor and a capacitor implemented in parallel between the ports.
Implementation Method 3
One embodiment of the RC network includes a resistor and a capacitor implemented in parallel between the ports.
Data Source
AI summary
A Wilkinson Combiner circuit is disclosed. The circuit includes first and second input ports, and a resistive-capacitive (RC) network coupled there between. The circuit further includes an amplifier having an amplifier input node, and a coupled inductor. The coupled inductor includes first, second, and third terminals, coupled to the first input port, the second input port, and the amplifier input node, respectively. Signals conveyed from the first and second input ports are passed through the corresponding portions of the coupled inductor, are combined into a composite signal and amplified by the amplifier.