Phase Shift Circuit Using Lead-Lag Branches to Cut Line Length
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Solution Overview
Problem
Existing phase shift circuits occupy a large volume due to the need for long transmission lines to achieve a desired phase shift amount, which increases the size and cost of the circuit.
Innovation Solution
A phase shift circuit design that includes a phase lead branch circuit and a phase lag branch circuit, utilizing a phase lead unit to reduce the required length of transmission lines in the phase lag branch, thereby minimizing the overall volume and cost while maintaining the same phase shift amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a larger phase shift amount is achieved by increasing the phase lag amount on each transmission path, then the desired phase shift is obtained, but the length of transmission lines increases, causing a larger volume occupied by the phase shift circuit
Solution Approach 1:
The phase shift circuit is divided into multiple independent transmission paths (first transmission path with phase lead unit, second transmission path with phase lag unit). Each path contributes partially to the total phase shift, allowing the circuit to achieve the desired phase shift amount while keeping individual path lengths short and the overall volume small.
Solution Approach 2:
Instead of using only phase lag (conventional approach), the invention introduces a phase lead unit that provides positive phase shift. This inverted approach (using phase lead instead of or in addition to phase lag) reduces the required length of transmission lines while achieving the same net phase shift amount.
2Measurement precision
If long transmission lines are used to achieve a desired phase shift amount, then the phase shift is obtained, but the circuit occupies more space and increases in cost
Solution Approach 1:
The circuit is segmented into multiple transmission paths with different functions (phase lead and phase lag). This segmentation allows each segment to be optimized independently, reducing the total length of transmission lines required while maintaining the desired phase shift performance, thereby lowering manufacturing costs and size.
Solution Approach 2:
The invention changes the phase parameter by introducing both phase lead and phase lag components. This parameter change allows the circuit to achieve the required phase shift with shorter transmission lines, reducing material usage and manufacturing cost.
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 design reduces the volume and cost of the phase shift circuit, enhances its power capacity, and improves its linear indicator by reducing voltage requirements and minimizing material usage.
Implementation Method 1
When a radio frequency signal passes through a transmission line with a specific length, a phase lag occurs. In addition, when passing through transmission lines with different lengths, a same radio frequency signal has different phase lag degrees.
Data Source
AI summary
This application provides a phase shift circuit which includes an input end, an output end, a phase lead branch circuit, and a phase lag branch circuit. The phase lead branch circuit and the phase lag branch circuit are connected in parallel between the input end and the output end. The phase lead branch circuit includes a first radio frequency switch unit and a phase lead unit connected in series between the input end and the output end. The phase lag branch circuit includes a second radio frequency switch unit connected between the ground and a first connection point between the first phase lag unit and the second phase lag unit, a first phase lag unit, and a second phase lag unit. The first phase lag unit and the second phase lag unit are connected in series between the input end and the output end.