Waveguide-Fed Patch Antenna for Compact Circular Polarization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing circularly polarized antennas using waveguide feeds are bulky due to the large size of waveguide rectangular-to-circular converters, leading to increased antenna thickness.
Innovation Solution
The use of a radiation patch on a dielectric substrate to convert linearly polarized radiation signals into circularly polarized signals, reducing the overall thickness by minimizing the space occupied by the radiation patch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a waveguide rectangular-to-circular converter is used to convert linearly polarized radiation signals into circularly polarized signals, then the polarization conversion function is achieved, but the antenna thickness increases significantly
Solution Approach 1:
The patent extracts the circular polarization conversion function from the traditional waveguide converter and implements it through a radiating element with specific geometric structure. The radiating element integrates both radiation and polarization conversion functions, eliminating the need for a separate bulky converter component and thereby reducing antenna thickness.
Solution Approach 2:
The patent transitions from a three-dimensional waveguide converter structure to a two-dimensional radiating element structure on a substrate. By designing the radiating element with specific planar geometric patterns (such as rotated rectangular patches), the polarization conversion is achieved in the planar domain rather than requiring longitudinal space, thus reducing antenna thickness.
2Adaptability or versatility
If a traditional waveguide rectangular-to-circular converter is employed, then linearly polarized signals can be converted to circularly polarized signals, but the overall antenna size becomes large
Solution Approach 1:
The patent merges the radiation function and polarization conversion function into a single radiating element structure. The radiating element simultaneously serves as both the antenna radiator and the polarization converter, eliminating the need for separate components and thereby reducing the overall antenna volume.
Solution Approach 2:
The radiating element is designed to perform multiple functions: it acts as both the radiation source and the polarization conversion mechanism. By making the radiating element universal in its functionality, the patent eliminates the need for additional dedicated converter components, thus reducing the overall antenna volume.
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 allows for compact circular polarization conversion without increasing the antenna thickness, enhancing design efficiency and performance.
Implementation Method 1
the radiation patch is configured to convert a linearly polarized radiation signal transmitted via the first transmission port into a circularly polarized radiation signal
Data Source
AI summary
The present disclosure provides an antenna, and belongs to the field of radio frequency technology. The antenna provided by the present disclosure includes: a dielectric substrate, and a radiation patch and a waveguide feed structure, which are respectively disposed on two opposite sides of the dielectric substrate; an orthographic projection of a first transmission port of the waveguide feed structure on the dielectric substrate at least partially overlaps that of the radiation patch on the dielectric substrate; and the radiation patch is configured to convert a linearly polarized radiation signal transmitted via the first transmission port into a circularly polarized radiation signal. The antenna can realize conversion of the linearly polarized radiation signal into the circularly polarized radiation signal by adopting the radiation patch, so that a space occupied by the radiation patch can be reduced, thereby avoiding an increase in a thickness of the antenna.