Tunable Antenna Resonant Path Adjustment
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Solution Overview
Problem
The miniaturization of wireless communication device antennas is hindered by limited space, as they need to support multiple wireless communication standards and operate across various frequency bands.
Innovation Solution
A tunable antenna design utilizing a switch circuit or switchover element to select feeding modes, comprising a first and second radiating element, a connection circuit, and a switch circuit, which adjusts the resonant path length and feeding signal transmission to enable operation across broadband and multiband frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the antenna is designed to support multiple wireless communication standards and frequency bands, then the adaptability is improved, but the antenna size increases and occupies more space
Solution Approach 1:
The patent employs a tunable antenna structure with variable geometric parameters that can be dynamically adjusted to resonate at different frequency bands. The antenna includes adjustable elements such as movable shorts, variable length arms, or reconfigurable feeding points that allow the same physical structure to adapt its electrical length and resonant characteristics, enabling multi-band operation without requiring separate antennas for each band
Solution Approach 2:
The patent utilizes parameter tuning mechanisms including variable capacitance, adjustable inductance, or reconfigurable transmission line lengths to change the antenna's resonant frequency. By modifying electrical parameters such as the length of radiating elements, position of grounding points, or value of matching components, the antenna can be tuned across multiple frequency bands while maintaining a compact physical footprint
2Volume of moving object
If the antenna is miniaturized to reduce occupation space, then the volume is reduced, but the bandwidth and radiation efficiency deteriorate
Solution Approach 1:
The patent employs nested or folded antenna structures where radiating elements are arranged in space-efficient configurations such as meander lines, spiral patterns, or folded geometries. These nested structures increase the effective electrical length within a reduced physical footprint, allowing the miniaturized antenna to maintain adequate bandwidth by achieving sufficient resonant path length without increasing overall device volume
Solution Approach 2:
The patent transitions from planar two-dimensional antenna layouts to three-dimensional structures utilizing vertical spacing, layered configurations, or立体 geometries. By adding the third dimension, the antenna achieves longer resonant paths and broader bandwidth characteristics within a compact volume, as the radiating elements extend in multiple spatial directions rather than being confined to a single plane
3Volume of moving object
If the antenna is miniaturized to reduce occupation space, then the volume is reduced, but the radiation efficiency deteriorates
Solution Approach 1:
The patent introduces intermediary components such as defected ground structures, parasitic elements, or coupling mechanisms that enhance the radiation efficiency of miniaturized antennas. These intermediary structures act as mediators to improve the coupling between the feed and radiating elements, reduce unwanted currents, and enhance the overall radiation performance without requiring the antenna to be physically larger
Data Source
AI summary
A tunable antenna including a first radiating element, a second radiating element, a connection circuit and a switch circuit is provided. The first radiating element includes a coupling portion and a first feeding portion. The second radiating element includes a second feeding portion, a grounding portion and a radiation portion. The grounding portion is electrically connected to a ground plane, and the radiation portion surrounds the coupling portion to form a first coupling gap and the second coupling gap. The connection circuit is electrically connected to the radiation portion and a state of the connection circuit is changed according to a control signal, so as to adjust a length of the resonant path of the radiation portion. A feeding signal is transmitted to the first feeding portion or the second feeding portion by the switch circuit.