Sliding Microstrip Phase Shifter With Low Insertion Loss
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Solution Overview
Problem
Existing phase shifters in base stations, whether through path length or dielectric constant changes, face issues of power distribution changes and complex design due to the need for sliding components, leading to increased insertion loss and design complexity.
Innovation Solution
A phase shifter design featuring a sliding plate with microstrip lines and a signal transmission path that introduces infinite impedance at specific points, reducing the need for additional transmission line length and minimizing insertion loss by maintaining signal transmission integrity during sliding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a sliding part is used to change path length or dielectric constant for phase shifting, then phase shifting function is achieved, but output impedance changes causing power distribution changes and increased insertion loss
Solution Approach 1:
The patent changes the electrical parameters of the transmission path by introducing infinite impedance at specific points through the sliding plate. This allows phase shifting to be achieved through parameter modification rather than physical path length change, reducing insertion loss while maintaining the phase shifting function.
2Ease of operation
If a sliding medium block is used to change dielectric constant for phase shifting, then phase shifting function is achieved, but more extra space is needed and design becomes more complex
Solution Approach 1:
The patent extracts the dielectric block from the traditional sliding mechanism and replaces it with a sliding plate that introduces infinite impedance through microstrip line coupling. This eliminates the need for large sliding medium blocks and reduces design complexity while maintaining phase shifting capability.
Solution Approach 2:
The patent transitions from a one-dimensional sliding path to a two-dimensional microstrip line coupling structure. The sliding plate creates electromagnetic coupling between microstrip lines, introducing infinite impedance at specific points, which achieves phase shifting without requiring additional space for sliding medium blocks.
3Ease of operation
If traditional sliding mechanisms are used for phase shifting, then phase shifting is achieved, but power distribution changes occur affecting signal quality
Solution Approach 1:
The patent modifies the electrical parameters of the transmission path by introducing infinite impedance at specific coupling points through the sliding plate. This parameter change allows phase shifting while maintaining stable power distribution, as the infinite impedance points do not affect the overall power flow in the transmission lines.
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 solution reduces insertion loss and simplifies the design by maintaining signal transmission integrity and reducing the need for extra transmission line length, enhancing the phase shifting function in base stations.
Implementation Method 1
introduces an infinite impedance at two coupling points on the two parallel microstrip lines where the signal transmission path is coupled to the two parallel microstrip lines
Data Source
AI summary
A phase shifter, an antenna unit, and a base station are disclosed. According to an embodiment, the phase shifter includes a first plate and a second plate slidable relative to the first plate. Two parallel microstrip lines are provided on a first surface of the first plate. A means electrically coupled to the two parallel microstrip lines is provided on a second surface of the second plate that faces to the first surface of the first plate. The means defines a signal transmission path which couples the two parallel microstrip lines, and introduces an infinite impedance at two coupling points on the two parallel microstrip lines where the signal transmission path is coupled to the two parallel microstrip lines.