Phase Shifter Resonance Shift for Broadband Operation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional high-pass/low-pass switch-type phase shifters have a narrow frequency band for achieving a desired phase amount due to the frequency characteristics of high-pass and low-pass filters, making it difficult to broaden the phase shifter's frequency band.
Innovation Solution
A phase shifter design that includes parallel paths with high-pass and low-pass filters, connected by switches and transmission lines, where the line length of the transmission lines is adjusted to shift the resonance caused by circuit constants and capacitance to the communication frequency band, allowing for broader frequency operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional high-pass/low-pass switch-type phase shifter is used, then the phase shifter can provide desired phase amounts at specific frequencies, but the frequency band is narrow due to filter characteristics
Solution Approach 1:
The patent adjusts the line length parameter of transmission lines to shift the resonance frequency to the communication frequency band. By changing this physical parameter, the phase shifter achieves broader frequency band coverage while maintaining desired phase amounts across the expanded range
Solution Approach 2:
Transmission lines are introduced as intermediary elements between the filters and switches. These transmission lines act as mediators that introduce controlled resonance to broaden the frequency band, allowing the system to achieve wider adaptability without compromising phase accuracy
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
This design effectively increases the frequency band for achieving a desired phase amount, enabling coverage of a wider range, such as 8 to 12 GHz, while maintaining a compact size and improving phase and amplitude characteristics.
Implementation Method 1
a line length of the transmission line is adjusted such that a resonance caused due to circuit constants of the high-pass filter and the low-pass filter and capacitance obtained when the switch is OFF is shifted to a communication frequency band
Data Source
AI summary
First and second paths (I,II) are connected in parallel between an input terminal (IN) and an output terminal (OUT). A high-pass filter (HPF) is provided in the first path (I). A low-pass filter (LPF) is provided in the second path (II). A switch (SW1-SW4) connects one of the high-pass filter (HPF) and the low-pass filter (LPF) to the input terminal (IN) and the output terminal (OUT) and disconnects the other. A transmission line (TL1,TL2) is provided on the first and second paths (I,II) respectively. A line length of the transmission line (TL1,TL2) is adjusted such that a resonance caused due to circuit constants of the high-pass filter (HPF) and the low-pass filter (LPF) and capacitance obtained when the switch (SW1-SW4) is OFF is shifted to a communication frequency band.