Battery Cover Antenna Layout for Isolation and Wideband Coverage
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Solution Overview
Problem
The challenge of antenna design in electronic devices with metal frames and glass battery covers is the excessive space occupation by low-frequency antennas, leading to deteriorated isolation and interference with other antennas, which is exacerbated by the trend towards compact designs and increased frequency band coverage.
Innovation Solution
The implementation of a coupling feeding mechanism with radiators on the inner surface of the battery cover, utilizing a first and second radiator positioned on either side of a coupling feeding element, allowing for distributed feeding and double resonance to reduce layout area on the metal frame and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low-frequency antennas are designed on the metal frame with large distance between them, then isolation between antennas is improved, but the layout area on the metal frame increases excessively
Solution Approach 1:
The patent moves the low-frequency antenna elements from the metal frame to the battery cover, utilizing a different spatial plane. The battery cover serves as the mounting surface for the radiating elements, effectively changing the dimension where antennas are deployed. This allows antennas to be positioned without occupying metal frame area while maintaining isolation through proper spacing on the battery cover surface.
Solution Approach 2:
The battery cover acts as an intermediary substrate between the metal frame and the antenna elements. By placing antennas on the battery cover rather than directly on the metal frame, the design uses the battery cover as a mediating platform that provides both mechanical support and electrical isolation, enabling compact layout without compromising antenna performance.
2Adaptability or versatility
If the quantity of antennas increases to cover more frequency bands, then frequency band coverage is improved, but the antenna space becomes sharply compressed
Solution Approach 1:
The battery cover is designed to serve multiple functions: it acts as the rear housing cover, provides structural support, and simultaneously serves as the mounting platform for multiple antenna elements across different frequency bands. This multi-functional use of the battery cover maximizes the utilization of available space for antenna deployment without compromising other device functions.
Solution Approach 2:
The antenna system is segmented into multiple independent radiating elements that can be independently designed and positioned on the battery cover. Each element can be optimized for specific frequency bands, allowing diverse frequency coverage while maintaining compact overall layout. The segmentation enables flexible arrangement of multiple antennas without requiring large continuous space.
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
This approach effectively reduces antenna design space, enhances radiation performance, and improves isolation between antennas, enabling wide frequency band coverage while optimizing the device's layout and ensuring stable signal transmission.
Implementation Method 1
double resonance may be excited to implement wide frequency band coverage
Data Source
AI summary
An antenna apparatus for an electronic device having a middle frame, a cover, and a battery located between the middle frame and the cover. The antenna apparatus includes at least one group of coupling feeding elements and at least one group of radiation elements. A first radiator and a second radiator in each group of radiation elements are arranged on an inner surface of a cover. The first radiator and the second radiator are respectively located on two sides of a coupling feeding element, and the coupling feeding element is separately coupled to feed the first radiator and the second radiator.