Resonator Clearance for Antenna Isolation and Radiation Efficiency
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Solution Overview
Problem
In wireless terminals with multimode GSM/WCDMA/CDMA/LTE and receive diversity technologies, the close spacing of antennas leads to mutual coupling, reducing radiation efficiency due to electromagnetic wave coupling between main and diversity antennas, especially at low frequencies, and existing solutions like resonant devices on metal grounds result in energy loss as radiated energy is converted to heat.
Innovation Solution
A wireless terminal design featuring a resonator on a bracket with a clearance from the printed circuit board (PCB) acting as a metal ground for both antennas, improving isolation and allowing secondary radiation of energy, thereby enhancing radiation efficiency by preventing energy wastage within the resonator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resonant device is installed on a metal ground between antennas to change current distribution, then isolation between antennas is improved, but radiated energy is converted into heat inside the resonator due to conduction and dielectric loss, reducing radiation efficiency
Solution Approach 1:
The patent changes the structural parameters of the resonator by introducing a non-metallic support structure that elevates the resonator above the metal ground plane. This parameter change (elevating the resonator by a certain height) allows the resonator to maintain its isolation function while reducing the coupling between the resonator and the metal ground, thereby minimizing energy loss through conduction and dielectric loss.
2Volume of moving object
If multiple antennas are placed close together on a wireless terminal to reduce device size, then the terminal size is reduced, but mutual coupling between antennas increases, affecting radiation efficiency
Solution Approach 1:
The patent introduces a non-metallic support structure as an intermediary between the resonator and the metal ground plane. This intermediary structure serves as a mediator that allows the resonator to be positioned close to the metal ground for compactness while preventing direct contact that would cause energy loss, thus resolving the contradiction between compact size and radiation efficiency.
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 effectively improves antenna isolation and radiation efficiency by allowing the resonator to radiate energy without converting it to heat, thus enhancing the performance of wireless terminals.
Implementation Method 1
a clearance exists between the resonator and the printed circuit board... allowing secondary radiation of the energy of the antennas
Implementation Method 2
a method is to install a resonant device onto a metal ground between antennas, so as to change current distribution on the metal ground when the antennas are in a working state
Data Source
Figure 1a~1b
Figure 1c~2a
Figure 2b
AI summary
A wireless terminal is disclosed. The wireless terminal includes a first antenna, a second antenna, a printed circuit board, a bracket, and a resonator, where the first antenna is located at one side of the printed circuit board, the second antenna is located at another side of the printed circuit board, the printed circuit board functions as a metal ground of the first antenna and the second antenna, the resonator is located on the bracket, a ground point of the resonator is located on the printed circuit board, and a clearance exists between the resonator and the printed circuit board. Not only does the wireless terminal improve isolation between multiple antennas, but also the resonator can better radiate energy of the antennas because a clearance exists between the resonator and the PCB. Therefore, it is avoided that the energy of the antennas flowing into the resonator is wasted in the resonator, thereby implementing secondary radiation of the energy of the antennas, and improving radiation efficiency of the antennas.