Movable Antenna Module for Compact Wireless Devices
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Solution Overview
Problem
The challenge in achieving a full-screen design for electronic devices such as mobile phones and personal digital assistants is the difficulty in reducing the size of the keep-out-zone for the antenna, which interferes with other electronic components.
Innovation Solution
The antenna structure incorporates a moving module with an extending portion that can be slid or rotated to electrically connect with radiating portions, effectively lengthening them and improving radiating characteristics, while a matching and switching circuit adjust impedance to cover various frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the antenna structure uses a fixed radiating portion, then the manufacturing is simple, but the frequency coverage is limited
Solution Approach 1:
The patent implements a movable module that can slide between a first position and a second position, transforming the antenna from a static structure to a dynamic one. When the movable module slides to the second position, the extending portion electrically connects to the radiating portion, effectively lengthening it and enabling coverage of lower frequency bands (700-960 MHz). When at the first position, the antenna covers higher frequency bands (1710-2690 MHz). This dynamic reconfiguration allows a single antenna structure to adapt to multiple frequency bands without requiring separate antennas for each band.
2Area of stationary object
If the keep-out-zone size is reduced, then the full-screen design is achieved, but the antenna performance deteriorates
Solution Approach 1:
The patent utilizes the movable module's sliding motion along the side frame as an additional degree of freedom to resolve the space conflict. By moving the extending portion between two positions along the side frame, the antenna can achieve different effective lengths without increasing the footprint area on the baseboard. This allows the keep-out-zone to remain compact while still achieving both low-frequency and high-frequency performance through positional adjustment rather than spatial expansion.
3Adaptability or versatility
If the radiating portion length is increased, then the low-frequency coverage is improved, but the device size increases
Solution Approach 1:
The patent employs a movable module that can dynamically adjust the effective length of the radiating portion by sliding between positions. The extending portion of the movable module electrically connects to the radiating portion only when the movable module is at the second position, effectively lengthening the antenna for low-frequency operation. When the movable module is at the first position, the effective length is shorter for high-frequency operation. This dynamic length adjustment allows the antenna to achieve both long and short effective lengths using the same physical structure, avoiding the need for multiple antennas or a consistently long antenna that would increase device size.
Data Source
AI summary
An antenna of reduced size but of multiple functions according to manual adjustment includes a side frame made of metallic material, a feeding portion, and a moving module. The side frame defines first and second gaps each passing through the side frame to form at least one radiating portion. The feeding portion can feed current to either of the radiating portions. The metallic and movable moving module including an extending portion is movable relative to the side frame. In a first position, the extending portion is not connected to any radiating portion, and when moved to a second position, the extending portion is connected to one of the radiating portions.