Compact Multi-Antenna Assembly With Orthogonal Polarization Isolation
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Solution Overview
Problem
Compact devices with multiple antennas operating in the same frequency band face challenges in achieving sufficient antenna isolation, leading to issues like receiver degradation, noise coupling, and reduced efficiency due to closely spaced antennas.
Innovation Solution
A device comprising a first antenna with a first polarization operating at a first frequency and a second antenna with a second polarization operating at a second frequency, where the polarizations are orthogonal and the antennas are positioned close to each other, achieving high antenna isolation and directional gain while maintaining a compact form by using a slot antenna and a dipole antenna configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If antennas are closely spaced to maintain compact device size, then device compactness is improved, but antenna isolation deteriorates leading to receiver degradation and noise coupling
Solution Approach 1:
The patent applies local quality by making each antenna element have a specific polarization orientation (first antenna with first polarization, second antenna with second polarization orthogonal to the first) to achieve frequency separation and isolation while maintaining close spacing for compact device form factor
Solution Approach 2:
The patent uses orthogonal polarizations (different spatial dimensions) to separate the antenna functions in the same physical space, allowing multiple antennas to operate in the same frequency band without interference while maintaining compact device size
2Reliability
If traditional antenna arrangements are used in compact devices, then device complexity is reduced, but antenna isolation and directional gain are insufficient
Solution Approach 1:
The patent segments the antenna system into distinct first and second antenna elements with different polarizations, allowing each to operate independently in the same frequency band while achieving isolation through their orthogonal polarization characteristics
Solution Approach 2:
The patent changes the polarization parameter of each antenna element (first polarization vs. second orthogonal polarization) to achieve frequency separation and isolation, enabling compact multi-antenna operation without requiring complex spacing arrangements
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 configuration achieves significant antenna isolation and high directional gain, exceeding the performance of traditional antenna arrangements, ensuring radio functionality in a compact design without increasing physical space, as demonstrated by the example of a handheld RFID reader.
Implementation Method 1
a first antenna with a first polarization operating at a first frequency and a second antenna with a second polarization operating at a second frequency, where the polarizations are orthogonal
Data Source
AI summary
A device is comprised of: a first antenna, having a first polarization, operating at a first frequency, and located along a first length from a first end to a second end; and a second antenna, having a second polarization, operating at a second frequency, and located along a second length from a third end to a fourth end, wherein the first polarization is orthogonal to the second polarization, the first antenna is close to the second antenna along the first length and the second length, the first frequency of the first antenna and the second frequency of the second antenna are within the same frequency band, and the first antenna and the second antenna are parallel along the first length and the second length.