Terminal Antenna Common-Mode Feed for High Isolation
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Solution Overview
Problem
Current antenna technologies face limitations in operating modes and high isolation requirements, particularly in terminal devices, where the fixed feeding mode restricts antenna disposition and impedance settings, and achieving high isolation between multiple antennas is challenging.
Innovation Solution
The development of a terminal antenna system that includes a first excitation part and a first radiation part, where a common-mode feed is disposed between them, allowing for N-time wavelength excitation and enabling high-isolation operation through low-impedance common-mode feeding, which enriches antenna excitation modes and facilitates better radiation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed feeding mode is used, then the antenna structure is simple, but the antenna disposition location and impedance settings are restricted
Solution Approach 1:
The patent applies dynamics by enabling the antenna to operate in multiple operating modes (different wavelength modes such as 0.5-time wavelength mode, 1.5-time wavelength mode, etc.) through a feed that can switch between common-mode and differential-mode feeding. This dynamic capability allows the antenna to adapt to different disposition locations and impedance settings without changing the physical structure, thereby resolving the contradiction between structural simplicity and adaptability.
2Productivity
If multiple antennas are disposed on a terminal device, then the wireless communication capability is enhanced, but achieving high isolation between antennas becomes difficult
Solution Approach 1:
The patent applies parameter changes by utilizing the feed's ability to switch between common-mode and differential-mode feeding to achieve high isolation between multiple antennas. By changing the feeding mode parameter, the antenna can be configured for high isolation performance when multiple antennas are disposed in close proximity on a terminal device, thereby resolving the contradiction between enhanced wireless communication capability and maintaining high isolation between antennas.
3Loss of energy
If common-mode feed is used for N-time wavelength excitation, then the radiation efficiency is improved, but the feed impedance becomes low
Solution Approach 1:
The patent applies dynamics by designing a feed that can dynamically switch between common-mode and differential-mode feeding. When N-time wavelength excitation is needed for improved radiation efficiency, the feed operates in common-mode with low impedance. When impedance matching is required, the feed can switch to differential-mode. This dynamic switching capability resolves the contradiction between radiation efficiency and impedance matching reliability.
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 enables the terminal antenna to operate in various wavelength modes, including N-time wavelength, with improved radiation efficiency and high isolation characteristics between antennas, enhancing wireless communication performance in electronic devices.
Implementation Method 1
the first excitation part is configured to generate an electric field between the first excitation part and the first radiation part under excitation of the common-mode feed, and the electric field is used to excite the first radiation part for radiation
Data Source
AI summary
A terminal antenna includes a first excitation part and a first radiation part, and the first excitation part is disposed at a middle location of the first radiation part. A common-mode feed is disposed on the first excitation part, and the common-mode feed is disposed between the first radiation part and the first excitation part. The common-mode feed is one or two feeds disposed between the first excitation part and the first radiation part.