Dual-Frequency Antenna Device With Segmented Matching Circuits
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Solution Overview
Problem
Conventional antenna devices experience reduced performance due to interference from adjacent matching members when switching between frequency bands, affecting operation and antenna efficiency.
Innovation Solution
A dual-frequency antenna device incorporating a diplexer, high-frequency antenna, and a low-frequency antenna module with independent signal paths and matching circuits, utilizing a DP3T switch with two switching units to connect electrical connection points to distinct switching points, ensuring non-interference between signal paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional antenna device uses a switch with matching members connected to different switching points, then the antenna can operate in different frequency bands, but the adjacent matching members connected to non-chosen switching points interfere with the operation and reduce antenna performance
Solution Approach 1:
The antenna device is segmented into multiple independent signal paths, each with its own matching member. The switching mechanism selectively connects only the required signal path to the antenna, while isolating other paths. This segmentation prevents interference between different frequency band configurations and maintains antenna performance across frequency band switching operations
Solution Approach 2:
A switching mechanism acts as an intermediary between the multiple matching members and the antenna. This intermediary selectively connects the antenna to the appropriate matching member based on the desired frequency band, while electrically isolating the antenna from non-chosen matching members. The switch serves as a mediator that enables frequency band switching without allowing harmful interference from inactive matching members
Data Source
AI summary
A low-frequency antenna module includes two switching units, a first matching circuit, a second matching circuit, and a low-frequency antenna. Each of the two switching units includes an electrical connection point, a first switching point, and a second switching point. The first matching circuit is electrically connected to the two first switching points, the second matching circuit is electrically connected to the two second switching points, and the low-frequency antenna is electrically connected to one of the two electrical connection points. The two switching units are synchronously operated to electrically connect the two electrical connection points to the two first switching points or to the two second switching points. Thus, the low-frequency antenna can be applied to match the first matching circuit in a first low-frequency band or the second matching circuit in a second low-frequency band different from the first low-frequency band.