Printed Loop Antenna Branch Switching for Multi-Band Coverage
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Solution Overview
Problem
Single radiation mode of loop antennas fails to achieve high radiation efficiency across different frequency bands, resulting in a limited coverage area for operating frequencies.
Innovation Solution
A printed antenna design featuring a loop antenna body with multiple branches and switch components between them, allowing for the connection or disconnection of adjacent branches to adjust operating frequencies and directivity patterns, expanding coverage areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single radiation mode loop antenna is used, then the antenna structure is simple, but the operating frequency coverage area is limited
Solution Approach 1:
The loop antenna body is divided into multiple loop antenna branches (first, second, third, and fourth branches). Switch components are disposed between adjacent branches to enable selective connection or disconnection. This segmentation allows different combinations of branches to be activated, creating multiple radiation modes that cover different frequency bands, thereby resolving the contradiction between simple structure and broad frequency coverage.
Solution Approach 2:
The antenna incorporates switch components that can dynamically change the connection state between adjacent loop antenna branches. By controlling these switches, the antenna can transition between different radiation modes and adapt to different frequency bands in real-time, transforming a static single-mode antenna into a dynamic multi-mode antenna that maintains both structural simplicity and frequency versatility.
2Adaptability or versatility
If multiple radiation modes are implemented to expand frequency coverage, then the operating frequency coverage area increases, but the antenna structure becomes complex
Solution Approach 1:
Multiple loop antenna branches are merged into a single integrated antenna structure printed on one substrate. The branches share common elements such as the feed port and ground connections, and are interconnected through switch components. This merging approach enables multi-frequency operation while avoiding the complexity of completely separate antenna structures, as all branches work together as a unified system with selective activation.
3Adaptability or versatility
If switch components are added to enable frequency switching, then the directivity pattern coverage area expands, but the manufacturing complexity increases
Solution Approach 1:
The switch components are implemented as electronic elements (such as diodes or transistors) that can be printed or mounted on the same substrate as the antenna branches. This replaces mechanical switching mechanisms with electronic switching, allowing frequency and pattern control through electrical signals. The entire antenna structure including switches can be fabricated using standard PCB printing techniques, maintaining ease of manufacture while enabling complex multi-mode operation.
Data Source
AI summary
A printed antenna may include a loop antenna body, a feed port, and a switch component. The loop antenna body includes a first end and a second end, there is a spacing between the first end and the second end, a connection line between the first end and the second end forms a closed loop with the loop antenna body. The feed module is configured to output a feed signal to the loop antenna body by using the feed port. The loop antenna body includes a plurality of loop antenna branches, the switch component is disposed between every two adjacent loop antenna branches, and the switch component is configured to connect or disconnect the two adjacent loop antenna branches.