Phase Lag Cell Antenna Planar Reflector Phase Compensation
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Solution Overview
Problem
The implementation of a parabolic reflector with a planar reflecting plate in antennas leads to phase differences in reflected waves, resulting in reduced directivity due to varying distances between the radiation source and the reflector, which complicates the manufacturing and portability of parabolic antennas.
Innovation Solution
A phase lag cell with a planar reflecting plate, a substrate, and phase lag circuits featuring L-shaped patterns and adjustable stubs is used to compensate for phase differences by adjusting stub lengths, allowing for sequential phase shifts and improved wave synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a parabolic reflector is replaced with a planar reflecting plate, then the antenna becomes easier to manufacture and more portable, but phase differences are generated in reflected waves causing directivity to decline
Solution Approach 1:
The patent applies local quality by introducing phase lag circuits at specific locations on the planar reflecting plate. These circuits are positioned according to the distance from the radiation source to compensate for phase differences locally, thereby maintaining overall directivity while preserving the ease of planar manufacturing
Solution Approach 2:
The patent changes the electrical parameter (phase) of the reflected waves by introducing phase lag circuits with adjustable stub lengths. By adjusting the stub lengths, the phase of reflected waves at different locations is modified to compensate for the phase differences caused by the planar geometry, thus maintaining directivity
2Weight of stationary object
If a parabolic reflector is replaced with a planar reflecting plate, then the antenna structure becomes simpler and lighter, but the directivity and radiation pattern accuracy deteriorate
Solution Approach 1:
The patent introduces phase lag circuits at specific locations on the planar reflecting plate to locally compensate for phase differences. This approach maintains the light weight and simple structure of the planar design while restoring directivity through localized phase correction
Solution Approach 2:
The phase lag circuits act as intermediary elements between the planar reflecting plate and the radiation source. These circuits mediate the phase relationship by introducing controlled phase delays that compensate for the geometric phase differences, thereby maintaining directivity without requiring a heavy parabolic structure
3Measurement precision
If stub lengths in phase lag circuits are adjusted, then phase compensation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent adjusts the stub lengths in phase lag circuits to change the phase delay characteristics. By optimizing these parameters, accurate phase compensation is achieved while maintaining a relatively simple circuit structure that does not significantly increase device complexity
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 solution enables wide-range phase compensation, maintaining high directivity across a wide frequency band, similar to parabolic reflector antennas, while being more portable and easier to manufacture.
Implementation Method 1
a phase lag cell capable of compensating for phase differences of reflected waves generated when a parabolic reflector antenna is implemented in a planar shape
Implementation Method 2
since a distance between a radiation source and each portion of the parabolic reflector and a distance between the radiation source and each portion of the planar reflecting plate are different, phase differences between the reflected waves are generated
Data Source
AI summary
A phase lag cell and an antenna including the same are disclosed. A phase lag cell according to one embodiment of the present invention comprises: a plane reflector; a substrate spaced apart and positioned at a predetermined distance from the reflector; and a phase lag circuit formed at one side of the substrate such that L-shaped patterns are formed to be vertically and horizontally symmetrical around a cross-shaped slot, and a stub having a predetermined length is extended from the end of each L-shaped pattern.