Cavity Ridge Antenna Layout for Compact Wideband Circular Polarization
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Solution Overview
Problem
Existing circularly polarized antennas are complex in structure, large in size, and not suitable for array formation, particularly in the millimeter wave band, which limits their miniaturization and bandwidth.
Innovation Solution
A compact broadband circularly polarized antenna design featuring a cavity with ridges for miniaturization and bandwidth widening, and baffles to form a spatial phase difference, allowing for a simpler structure that operates effectively in the millimeter wave band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional circularly polarized antenna structures are used, then circular polarization performance is achieved, but the antenna size becomes large and structure becomes complex
Solution Approach 1:
The antenna is divided into distinct functional segments: a feed section with orthogonal feed lines, a transition section, and a radiating section with ridges and baffles. Each segment performs a specific function, allowing the overall structure to be optimized independently while maintaining compact dimensions and simplicity.
Solution Approach 2:
The patent introduces vertical ridges and baffles within the cavity to create three-dimensional current paths and phase differences. By utilizing the vertical dimension inside the compact cavity, the antenna achieves circular polarization and bandwidth enhancement without increasing the overall footprint area.
2Volume of moving object
If antenna size is reduced for compactness, then miniaturization is achieved, but bandwidth becomes narrow
Solution Approach 1:
Different regions of the antenna cavity are assigned different properties: the feed section has specific impedance characteristics, the transition section transforms impedance, and the radiating section with ridges and baffles provides bandwidth enhancement. This localized optimization allows compact size while maintaining wide bandwidth through coordinated design of each region.
Solution Approach 2:
The patent modifies electromagnetic parameters by introducing ridges and baffles that alter the current distribution and phase characteristics within the compact cavity. These structural modifications change the resonant frequencies and impedance matching, enabling wide bandwidth operation in a miniaturized form factor.
3Adaptability or versatility
If conventional antenna structures are used, then basic radiation is achieved, but array formation capability is poor
Solution Approach 1:
The antenna design incorporates standardized feed interfaces and compact dimensions that make it suitable for both standalone operation and integration into arrays. The orthogonal feed structure and controlled phase characteristics enable the antenna to function effectively in various configurations, enhancing array formation capability without requiring complex specialized structures.
Data Source
AI summary
A compact broadband circularly polarized antenna includes an antenna body, wherein a cavity is formed in the antenna body, a plurality of ridges and a plurality of baffles are formed inside the cavity, the ridges are configured for antenna miniaturization and bandwidth widening, and the baffles are configured to form a spatial phase difference. In the present disclosure, the ridges of the circularly polarized antenna are divided into two parts, wherein the ridges located in a baffle mounting rectangular section and a front rectangular mounting section are configured for antenna miniaturization and bandwidth widening, and the baffles for forming a phase difference are arranged between the ridges located in the baffle mounting rectangular section. Through the above arrangement, the polarized antenna may be miniaturized, operate in a millimeter wave band, and achieve circular polarization; the bandwidth of the antenna is relatively wide.