Multi-Antenna Terminal Decoupling via LC Resonance
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Solution Overview
Problem
In multi-antenna terminals, especially handheld devices, the physical size constraints and aesthetic demands lead to suboptimal antenna spacing, resulting in significant signal interference due to common ground connections on the Printed Circuit Board (PCB), which complicates the reduction of mutual interference between adjacent antennas.
Innovation Solution
The implementation of a multi-antenna terminal design that includes a Printed Circuit Board (PCB), two antennas, an inductance element, and split-ring resonator groups arranged in parallel and connected to the PCB's grounding wire, forming an LC resonance circuit to effectively isolate signals between adjacent antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple antennas are placed close together to minimize terminal size, then the appearance and compactness of the terminal is improved, but signal interference between antennas increases due to common ground connection
Solution Approach 1:
The patent introduces a decoupling network as an intermediary component between adjacent antennas. This decoupling network includes inductance elements and split-ring resonator groups that are connected to the common ground wire, creating an LC resonance circuit that resonates at the operating frequency to block coupling current and reduce mutual interference between antennas while allowing the antennas to be placed in close proximity
Solution Approach 2:
The patent changes the electrical parameters of the ground connection by introducing reactive elements (inductance and capacitance) through the decoupling network. The split-ring resonator groups provide frequency-dependent impedance characteristics that transform the ground connection from a low-impedance path that allows coupling current to a high-impedance path at the operating frequency, thereby blocking interference while maintaining compact antenna spacing
2Shape
If multiple antennas are placed close together to meet appearance requirements, then the terminal aesthetics are improved, but manufacturing complexity increases due to the need for additional isolation components
Solution Approach 1:
The patent implements the decoupling network using planar printed circuit board structures with split-ring resonator groups and microstrip line inductance elements. These thin-film PCB-based components can be fabricated using standard PCB manufacturing processes, providing the necessary electromagnetic isolation functionality without adding significant structural complexity or requiring additional three-dimensional components
Solution Approach 2:
The decoupling network components serve multiple functions: the split-ring resonator groups provide both capacitive coupling and resonance functionality, while the inductance elements provide inductive coupling. Together they form an LC resonance circuit that blocks coupling current, isolates antennas, and maintains the common ground connection architecture, thereby reducing overall system complexity despite the added isolation functionality
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 configuration significantly reduces signal interference between adjacent antennas by creating an open circuit during resonance, enhancing signal isolation and minimizing mutual interference, even when antennas are closely spaced or co-grounded.
Implementation Method 1
one end of the inductance element is connected to the first split-ring resonator group, and the other end of the inductance element is connected to the second split-ring resonator group
Implementation Method 2
forming an LC resonance circuit to effectively isolate signals between adjacent antennas
Implementation Method 3
When two adjacent antennas receive signals, an extremely high coupling current will be formed between feeds of the two antennas, and it leads to mutual interference between the two adjacent antennas
Data Source
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AI summary
Provided is a multi-antenna terminal. The multi-antenna terminal includes a Printed Circuit Board (PCB), a first antenna, a second antenna, an inductance element, a first split-ring resonator group and a second split-ring resonator group. The first antenna and the second antenna are respectively connected to a grounding wire on the PCB; the first split-ring resonator group and the second split-ring resonator group are arranged between the first antenna and the second antenna; the first split-ring resonator group and the second split-ring resonator group are arranged in parallel, and respectively connected to a grounding wire on the PCB; one end of the inductance element is connected to the first split-ring resonator group, and the other end of the inductance element is connected to the second split-ring resonator group. The multi-antenna terminal can solve the problem that signals between respective antennas on the multi-antenna terminal interfere with one another in the related art, so that the use by people is more convenient. In addition, the multi-antenna terminal has the advantages of simple structure, lower cost and the like.