Adjustable Inductor Antenna for Dual-Band Wi-Fi
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Solution Overview
Problem
The metallic casing of handheld electronic devices interferes with wireless signal radiation, hindering wireless connections due to the crowded arrangement of antennas, particularly affecting dual-band Wi-Fi communication.
Innovation Solution
A dual-band Wi-Fi antenna structure with a metallic middle frame incorporating a printed circuit board grounding plane and an adjustable inductor within a rectangular recess, allowing for resonant frequency adjustment to match input impedance across both low (2.4 GHz) and high (5.15-5.85 GHz) frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metallic casing is used for the electronic device, then the device becomes more strong and durable and heat dissipation is improved, but wireless signal radiation is hindered
Solution Approach 1:
The metallic casing is segmented by introducing non-metallic components (plastic middle frame, plastic base, or plastic cover) to divide the continuous metallic structure. This segmentation creates signal transmission pathways that break the shielding effect of the complete metallic casing, allowing wireless signals to radiate effectively while maintaining structural strength through the metallic parts.
Solution Approach 2:
Non-metallic intermediary materials (plastic middle frame, plastic base, or plastic cover) are introduced between the metallic casing components and the antennas. These intermediary materials act as signal transmission mediators that allow electromagnetic waves to pass through, resolving the conflict between metallic casing strength and signal radiation capability.
2Adaptability or versatility
If GPS antenna, DIV antenna and BT/Wi-Fi antenna are arranged at the upper part of the base, then wireless communication functions are integrated, but antenna design, manufacturing and tuning become more complex
Solution Approach 1:
Multiple antenna functions (GPS, DIV, and BT/Wi-Fi) are merged into a single integrated antenna structure located at the upper part of the base. This unified design consolidates multiple antenna elements and their supporting structures into one compact unit, simplifying the overall antenna system design, manufacturing, and tuning processes while maintaining all required wireless communication functions.
Solution Approach 2:
The integrated antenna structure is designed to perform multiple wireless communication functions (GPS reception, diversity signaling, and Bluetooth/Wi-Fi communication) simultaneously. This multi-functional antenna reduces the number of separate antenna components needed, thereby simplifying the overall system complexity while providing versatile wireless connectivity.
3Temperature
If the middle frame is made of metal, then heat dissipation is improved, but antenna signal radiation is blocked
Solution Approach 1:
The middle frame is segmented by replacing metal with non-metallic plastic material in specific regions where antenna signals need to pass through. This segmentation allows the middle frame to maintain structural support and heat dissipation capabilities in metallic portions while creating signal transmission pathways in plastic portions, resolving the conflict between heat dissipation and signal radiation.
Solution Approach 2:
Non-metallic plastic material is introduced as an intermediary between the metallic components and the antennas in the middle frame structure. This plastic intermediary allows electromagnetic signals to pass through while the metallic parts continue to provide heat dissipation, effectively mediating between the conflicting requirements of thermal management and signal transmission.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The antenna structure effectively supports dual-band Wi-Fi communication by adjusting the resonant frequency, ensuring input impedance matching and radiation efficiency across both bands, reducing manufacturing complexity and cost.
Implementation Method 1
adjusting the resonant frequency, ensuring input impedance matching and radiation efficiency across both bands
Implementation Method 2
A dual-band Wi-Fi antenna structure with a metallic middle frame incorporating a printed circuit board grounding plane and an adjustable inductor
Data Source
AI summary
A dual-band Wi-Fi antenna structure includes a metallic middle frame of a casing of a handheld electronic device, a grounding plane received in the middle frame, an antenna body connected to the grounding plane, and an adjusting element. The grounding plane defines a rectangular recess in a corner thereof. The antenna body has a radiation patch having a part located over the recess. The adjusting element is located in the recess. An effective length of the recess is adjustable by adjusting a parameter of the adjusting element, which is a coefficient of self-inductance when the adjusting element is an adjustable inductor. By adjusting the effective length of the recess, a resonant frequency of the antenna structure at a low frequency band is adjustable, while a resonant frequency thereof at a high frequency band is not altered.