Integrated Power Divider With 180-Degree Phase Shift on PCB
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Solution Overview
Problem
Existing Wilkinson power dividers require external phase shifters to achieve a 180-degree phase difference, occupying large PCB areas and hindering equipment miniaturization.
Innovation Solution
A power divider design incorporating internal phase adjusting parts to achieve a 180-degree phase difference between output signals without external shifters, utilizing transmission lines, capacitors, and inductors to adjust signal phases, integrated on a printed circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external phase shifters are used to achieve 180-degree phase difference, then phase accuracy is improved, but PCB area increases
Solution Approach 1:
The patent merges the phase shifting function into the transmission lines themselves rather than using separate external phase shifters. The first and second transmission lines are designed with specific electrical lengths to inherently provide the required phase differences, eliminating the need for additional phase shifter components and reducing PCB area.
Solution Approach 2:
The patent changes the electrical parameters (length, impedance) of the transmission lines to achieve the desired phase difference. By carefully designing the electrical lengths of the first and second transmission lines, the system achieves 180-degree phase difference between output ports without requiring external phase shifting components.
2Ease of operation
If external phase shifters are used, then phase control is improved, but device complexity increases
Solution Approach 1:
The phase control function is merged into the transmission line design itself. The first transmission line provides a specific phase shift to the first output signal, and the second transmission line provides a different phase shift to the second output signal, achieving phase control without separate phase shifter components.
Solution Approach 2:
The transmission lines serve multiple functions: they transmit signals from the input port to output ports, provide impedance transformation, and simultaneously deliver the required phase shifts. This multi-functionality reduces the overall device complexity by eliminating dedicated phase control components.
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 design achieves a 180-degree phase difference efficiently, reduces PCB area, and meets miniaturization requirements while maintaining high isolation and power distribution accuracy.
Implementation Method 1
The first transmission line L1 is electrically connected between the input port P1 and the first output port P2, and the phase of the first output signal is adjusted through the first transmission line L1, so that the first output signal has a phase of -90 degrees
Implementation Method 2
The second transmission line L2 is electrically connected between the input port P1 and the second output port P3, and the phase of the second output signal is adjusted through the second transmission line L2, so that the second output signal has a phase of +90 degrees
Implementation Method 3
One end of a first capacitor C1 is electrically connected to the one end of the second transmission line L2, and the other end of the first capacitor C1 is electrically connected to the input port P1. One end of a third transmission line L3 is electrically connected to the other end of the first capacitor C1, and the other end of the third transmission line L3 is grounded
Implementation Method 4
One end of a first inductor Lr1 is electrically connected to the other end of the fourth transmission line L4, and the other end of the first inductor Lr1 is electrically connected to the first output port P2
Data Source
AI summary
A power divider includes an input port, a first output port, a second output port, a first phase adjusting part, a second phase adjusting part, and a matching part, wherein: the first phase adjusting part is connected in series between the input port and the first output port, and is configured to adjust a phase of a first output signal output by the first output port; the second phase adjusting part is connected in series between the input port and the second output port, and is configured to adjust a phase of a second output signal output by the second output port; the matching part is connected in series between the first output port and the second output port, and is configured to match the first output port with the second output port; a phase difference between the first output signal and the second output signal is 180 degrees.