Border Frame Circularly Polarized Antenna for Space-Limited Phones
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Solution Overview
Problem
Designing a circularly polarized antenna in the limited space of a mobile terminal product, such as a mobile phone, is challenging due to size constraints and the need for multiple antennas, which affects the polarization beam direction and radiation characteristics.
Innovation Solution
A circularly polarized antenna is implemented by forming border frame antennas on the border frame of a metal middle frame assembly, with feed points exciting both the border frame and radiation cavity to generate radiation currents and magnetic currents, achieving a main polarization beam direction towards the top of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a circularly polarized antenna is designed in a mobile terminal product, then good polarization radiation characteristic can be achieved, but the limited space and multiple antenna requirements make the design extremely difficult
Solution Approach 1:
The antenna system is segmented into multiple functional components: a border frame antenna formed on the border frame, a radiation cavity defined by the metal middle frame and conductor member, and multiple feed points. This segmentation allows each component to be optimized independently while working together to achieve circular polarization in limited space.
Solution Approach 2:
The invention utilizes the third dimension by stacking the metal middle frame and conductor member to create a radiation cavity with vertical extent. This dimensional approach allows the antenna to achieve circular polarization characteristics by controlling current distribution in three-dimensional space, overcoming the limitations of two-dimensional planar designs.
2Adaptability or versatility
If multiple antennas are implemented on an existing 5G mobile phone, then communication functions are enhanced, but the space for designing the satellite antenna becomes excessively limited
Solution Approach 1:
The border frame antenna structure is designed to serve multiple communication functions simultaneously. By configuring the border frame antenna and radiation cavity with appropriate feed points, the same structural elements can support both 5G communication and satellite communication frequencies, reducing the need for separate antenna systems.
Solution Approach 2:
The invention merges the satellite antenna design with the existing mobile phone frame structure. The border frame antenna is formed on the border frame itself, and the radiation cavity utilizes the space between the metal middle frame and conductor member, effectively combining structural support and antenna radiation functions in the same physical space.
3Reliability
If the main polarization beam direction is oriented toward the top of the device, then good circular polarization radiation characteristic on the top is achieved, but the antenna design becomes more complex in limited space
Solution Approach 1:
The feed points are strategically positioned to create localized current distributions that generate circular polarization specifically in the upward direction. The border frame antenna and radiation cavity are configured so that their electromagnetic fields combine to produce the desired polarization characteristic in the target direction while minimizing complexity elsewhere in the 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
The solution allows for effective implementation of a circularly polarized antenna in a limited space, ensuring good radiation characteristics and vertical polarization performance, enhancing communication capabilities in satellite and other communication technologies.
Implementation Method 1
the at least one feed point excites the border frame antenna to generate and form a radiation current, and excites the radiation cavity to generate and form a radiation magnetic current, to form a circularly polarized antenna
Implementation Method 2
circular polarization may overcome a problem of polarization mismatch caused by a Faraday rotation effect when the linearly polarized wave passes through an ionosphere
Data Source
AI summary
An electronic device is provided. The electronic device includes a middle frame assembly and a conductor member electrically connected to the middle frame assembly. The middle frame assembly includes a metal middle frame and a border frame. The border frame is located on an outer periphery of the metal middle frame, and at least one border frame antenna is formed on the border frame. The metal middle frame and the conductor member are stacked, and a region on the metal middle frame corresponding to the conductor member and the conductor member define a radiation cavity. At least one feed point is configured to feed the border frame antenna and the radiation cavity. The at least one feed point excites the border frame antenna to generate a radiation current, and excites the radiation cavity to generate a radiation magnetic current, to form a circularly polarized antenna.