Slit Antenna Design for Low-Frequency MIMO Correlation Reduction
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Solution Overview
Problem
In wireless communication devices using MIMO antennas, achieving low antenna correlation is challenging, especially in low-frequency bands like the 700-MHz band, where antenna design changes do not effectively reduce correlation due to high-frequency current flow through the circuit board, affecting communication speed.
Innovation Solution
A wireless communication device with a first antenna and a second slit antenna, where the slit antenna is formed by part of a conductive case panel and a conductive layer on a printed circuit board, electrically shorted by conductive contact members, with the slit's resonance frequency set higher than the communication frequency, forming a MIMO antenna device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional antenna design is used in low-frequency bands, then antenna structure is simple, but antenna correlation becomes high which lowers communication speed
Solution Approach 1:
The patent divides the antenna system into two distinct antennas with different structures: a conventional antenna and a slit antenna. The slit antenna is further segmented into a first conductive plate, a second conductive plate, and multiple short-circuiting members, creating a structured configuration that controls current distribution to reduce correlation while maintaining low-frequency operation.
Solution Approach 2:
The patent introduces short-circuiting members as intermediary elements between the first and second conductive plates. These short-circuiting members act as mediators that control the electrical connection and current flow paths, enabling the slit antenna to achieve low correlation characteristics at low frequencies by preventing high-frequency currents from flowing through the entire circuit board.
2Productivity
If antenna design is changed to improve correlation, then communication speed may improve, but device complexity increases
Solution Approach 1:
The patent makes the slit antenna structure serve multiple functions: it acts as a radiating element, a current distribution controller, and a correlation reduction mechanism simultaneously. The same structured configuration that creates the slit (with conductive plates and short-circuiting members) achieves both the desired radiation pattern and the low correlation characteristic, avoiding the need for separate components.
Solution Approach 2:
The patent merges the antenna radiation function with the correlation control function into a single integrated slit antenna structure. The conductive plates and short-circuiting members are combined to form one cohesive antenna element that simultaneously achieves radiation and low correlation, reducing the need for additional separate components.
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 reduces antenna correlation across multiple frequencies, including low bands, enhancing communication speed and efficiency by optimizing antenna design and placement.
Implementation Method 1
a short-circuiting structure electrically connected between the first conductive plate and the second conductive plate so as to electrically short the first conductive plate to the second conductive plate
Implementation Method 2
said predetermined interval being set so that a resonance frequency of the slit antenna is higher than a communications frequency used by said communications terminal apparatus
Data Source
AI summary
A communication terminal apparatus and wireless communication device include comprising a first antenna having a first feed point, and a second antenna including a slit antenna and having a second feed point, the second antenna being spaced apart from the first antenna. The slit antenna includes a first conductive plate, a second conductive plate disposed substantially parallel to the first conductive plate, and a short-circuiting structure electrically connected between the first conductive plate and the second conductive plate so as to electrically short the first conductive plate to the second conductive plate.