Planar Antenna Switching Current Paths for Multi-Frequency Operation
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Solution Overview
Problem
Conventional multi-frequency planar inverted-F antennas have a large volume, complex design, and cannot be flexibly switched to operate at multiple central frequencies, degrading communication quality due to increased parasitic elements and space occupation.
Innovation Solution
A planar antenna with a single radiator, utilizing a screening element to create dual current paths and a switch to toggle between frequency bands, allowing operation at multiple central frequencies without additional parasitic elements, thereby reducing volume and design complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple parasitic antenna elements and/or other branches are added to form multiple current paths for multi-frequency operation, then the antenna can operate at multiple central frequencies, but the antenna volume and design complexity increase
Solution Approach 1:
The patent employs a switching mechanism that dynamically reconfigures the antenna's current paths. The switch can connect or disconnect different portions of the radiator, allowing a single physical antenna structure to operate at multiple frequency bands by changing its electrical configuration rather than using multiple fixed parasitic elements
Solution Approach 2:
The single radiator is designed to serve multiple functions across different frequency bands. By incorporating a switch that can create different current paths through the same radiator structure, the antenna achieves multi-frequency operability without requiring separate dedicated radiators for each frequency band
2Adaptability or versatility
If multiple parasitic antenna elements and/or other branches are added to form multiple current paths for multi-frequency operation, then the antenna can operate at multiple central frequencies, but the design complexity increases
Solution Approach 1:
The switching mechanism provides dynamic reconfiguration capability, allowing the antenna to adapt its electrical characteristics for different frequency bands. This dynamic approach simplifies design compared to static multi-element structures, as the same physical radiator can be electrically reconfigured rather than requiring complex fixed arrangements of multiple parasitic elements
Solution Approach 2:
The patent merges multiple current paths into a single radiator structure. Instead of designing separate parasitic elements for different frequencies, the invention combines them into one integrated radiator with switchable connections, reducing the number of discrete components and simplifying the overall design
3Adaptability or versatility
If multiple parasitic antenna elements are added to achieve multi-frequency operation, then the antenna can transmit and receive signals at multiple operating frequencies, but the transceiving quality is degraded due to space occupation
Solution Approach 1:
The switching mechanism enables dynamic adaptation of the antenna's electrical length and configuration for optimal performance at different frequency bands. This allows the antenna to maintain good transceiving quality across multiple frequencies by reconfiguring its current paths rather than relying on fixed parasitic elements that may cause unwanted coupling and interference
Data Source
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AI summary
A handheld device and a planar antenna thereof are provided. The planar antenna comprises a radiator, a screening element and a switch. The screening element is configured to make the planar antenna operating in a first high-frequency (HF ) current path and a first low-frequency (LF) current path, and the switch is configured to make the planar antenna operating in a second HF current path and a second LF current path. The planar antenna operates at a first HF central frequency corresponding to the first HF current path and a first LF central frequency corresponding to the first LF current path when the switch is turned off, and operates at a second HF central frequency corresponding to the second HF current path and a second LF central frequency corresponding to the second LF current path when the switch is turned on.