Orthogonal Patch-Slot Antenna Diversity for Mobile Terminals
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Solution Overview
Problem
Mobile terminals face challenges in implementing diversity antennas due to their small size, leading to correlated signal reception and coupling between antennas, which limits the effectiveness of diversity techniques and signal-to-noise ratio improvement.
Innovation Solution
A compact multi-antenna system is proposed, where a patch-type antenna and a slot-type antenna are co-located on the same ground plane with orthogonal polarization directions, allowing for low coupling and independent impedance matching, enabling efficient reception diversity without increasing the terminal's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If antennas are placed close together in mobile terminals, then the device size is reduced, but signal correlation and coupling between antennas increase
Solution Approach 1:
The patent transitions from spatial separation (2D plane) to polarization separation (3D electromagnetic field dimension). By using orthogonal polarizations (horizontal and vertical) for the patch antenna and slot antenna respectively, the system achieves effective diversity without requiring large physical separation between antennas, thus solving the contradiction between compact size and signal diversity effectiveness.
2Reliability
If traditional polarization diversity antennas are used, then signal diversity is achieved, but the antenna structure becomes complex and difficult to integrate
Solution Approach 1:
The patent merges the patch antenna and slot antenna into a single integrated structure on one substrate. The patch antenna elements are positioned over slots in the ground plane, creating a unified antenna system that provides both horizontal and vertical polarizations without requiring separate antenna structures, thereby reducing overall complexity and improving integrability into mobile terminals.
Solution Approach 2:
The integrated patch-slot antenna structure serves multiple functions simultaneously: it provides polarization diversity (horizontal and vertical), operates at multiple frequency bands (dual-band or tri-band), and maintains a compact form factor. This multi-functionality eliminates the need for separate antennas for different purposes, reducing structural complexity while maintaining signal diversity effectiveness.
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 system achieves low coupling between antennas, allowing for effective polarization diversity and improved signal reception, enhancing the signal-to-noise ratio and facilitating integration into mobile terminals.
Implementation Method 1
a first antenna element of the patch-type antenna and a second antenna element of the slot-type antenna can each transmit and/or receive according to a rectilinear polarization, the polarization directions associated with the two antenna elements being orthogonal to each other
Data Source
Figure 1(A)~1(B)
Figure 2(A)~2(B)
Figure 3(A)~3(B)
AI summary
The invention relates to a polarization diversity multi-antenna system comprising a first, slot antenna (20) and at least one second, patch antenna (30), said first and second antennas sharing the same ground plane (10), the slot of the first antenna lying in said ground plane and the patch of the second antenna being at least partly plumb with said slot.