Compact Power Divider Layout Using λ/12 Transmission Lines
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Solution Overview
Problem
Conventional Wilkinson power dividers occupy a large area and have high manufacturing costs due to their design, which includes transmission lines of a quarter wavelength, making them inefficient for compact and cost-effective applications.
Innovation Solution
A power divider design using a first and second transmission line, an input capacitor, and two output capacitors, with each transmission line segment being one-twelfth of the target wavelength, and incorporating transistors and resistors for SPDT switch functionality, allowing for reduced size and cost while maintaining efficient signal handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Wilkinson power divider with quarter-wavelength transmission lines is used, then signal division function is achieved, but device area and manufacturing cost increase
Solution Approach 1:
The patent changes the transmission line length parameter from quarter-wavelength (λ/4) to one-twelfth-wavelength (λ/12), which fundamentally alters the electrical characteristics and allows for a more compact physical layout while maintaining the power division function through capacitive elements
Solution Approach 2:
The patent introduces capacitive elements (input capacitor and output capacitors) as a new dimensional component type, transitioning from purely transmission-line-based design to a hybrid design that utilizes both transmission lines and discrete capacitors, enabling miniaturization
2Reliability
If conventional Wilkinson power divider with quarter-wavelength transmission lines is used, then signal division function is achieved, but manufacturing cost increases
Solution Approach 1:
By changing the transmission line length to λ/12 and incorporating standard capacitor values, the design enables more economical manufacturing through reduced material usage and simplified fabrication processes compared to the traditional λ/4 design
3Area of stationary object
If transmission line length is reduced to one-twelfth wavelength, then device area is reduced, but signal handling efficiency must be maintained
Solution Approach 1:
The patent carefully selects and optimizes the capacitance values of the input and output capacitors to compensate for the reduced transmission line length, ensuring that the voltage division ratio and impedance matching are maintained despite the compact dimensions
Solution Approach 2:
The capacitive elements serve as intermediary components that mediate between the shortened transmission lines and the load, enabling the compact design to achieve proper signal division and impedance transformation without sacrificing performance
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 new power divider design achieves efficient signal division with reduced size and manufacturing cost, exhibiting low power loss and good linearity, suitable for RF transceiver systems operating in both transmit and receive modes.
Implementation Method 1
an input capacitor and two output capacitors. The input capacitor is connected between the second terminal of the first transmission line and ground. One of the output capacitors is connected between the second terminal of the first output portion and ground. The other one of the output capacitors is connected between the second terminal of the second output portion and ground.
Data Source
AI summary
A power divider includes first to third transmission lines (TLs) and first to third capacitors. The second TL includes a first transmission portion (TP) and a first output portion (OP). The first TP is connected between the first TL and the first OP. The third TL includes a second TP and a second OP. The second TP is connected between the first TL and the second OP. The first capacitor is connected between ground and a common node of the first TL and the first and second TPs. The second capacitor is connected between ground and a terminal of the first OP distal from the first TP. The third capacitor is connected between ground and a terminal of the second OP distal from the second TP.