L-Shaped Resonant Cavity Antenna for Front-Screen Signal Coverage
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Solution Overview
Problem
Conventional antennas on electronic devices, such as televisions, exhibit high directivity and poor signal coverage in front of the screen due to their placement at the intersection of device sides, leading to inadequate communication with front-facing devices.
Innovation Solution
The antenna design incorporates an L-shaped resonant cavity with multiple slots and a feed, positioned to reduce directivity by utilizing perpendicular planes relative to the metal backplane, and includes a filling medium to fix the feed, enhancing signal coverage in front of the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate antenna module is provided in the electronic device, then antenna functions are improved, but the number of components increases and assembly complexity increases
Solution Approach 1:
The patent combines the antenna function with the speaker assembly by integrating a first antenna on the backplate and a second antenna on the dust-proof rubber, allowing the speaker module to serve dual purposes of audio output and wireless communication, thereby reducing the number of separate antenna components
2Device complexity
If the antenna is integrated into the speaker assembly, then the number of components decreases, but the speaker performance may be compromised
Solution Approach 1:
The patent applies different materials to different parts of the speaker assembly for optimized performance: the backplate uses iron powder or ferrite material for magnetic field management and antenna function, while the dust-proof rubber provides acoustic isolation and houses the second antenna, allowing each component to excel at its specific function without compromising overall speaker performance
3Object-affected harmful factors
If electromagnetic shielding materials are added to the speaker assembly, then electromagnetic interference is reduced, but the structural complexity and manufacturing difficulty increase
Solution Approach 1:
The backplate serves multiple functions simultaneously: it provides electromagnetic shielding through iron powder or ferrite material, acts as a magnetic circuit component for the speaker, and functions as a substrate for the first antenna, thereby reducing the need for separate shielding components and simplifying the overall structure
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 design effectively reduces antenna directivity and increases signal coverage in front of the screen by using an L-shaped resonant cavity with multiple slots, ensuring even radiation distribution and improved communication with front-facing devices.
Implementation Method 1
a backplate, which shields the speaker unit from external magnetic fields and has a first antenna printed thereon and is made of iron powder or ferrite material
Implementation Method 2
a variable capacitor, which adjusts a resonance frequency of the speaker unit
Data Source
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AI summary
Embodiments of this application are applicable to the field of antenna technologies, and provide an antenna and an electronic device. The antenna is disposed in the electronic device, the electronic device includes a metal backplane, and the antenna includes a first resonant cavity and a feed. The first resonant cavity includes a first slot and a second slot, the first slot is provided on a first plane in the first resonant cavity, and the first plane is a plane on which a long side of the first resonant cavity is located; the second slot is provided on a second plane that is in the first resonant cavity and that is adjacent to the first plane, and the first plane and the second plane are perpendicular to a plane on which the metal backplane is located; and the feed is disposed in the first resonant cavity for feeding the antenna. By using the antenna provided in the embodiments of this application, signal coverage in front of a screen of the electronic device can be increased.