Dual Polarization Array Antenna Intermodulation Distortion
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Solution Overview
Problem
Dual polarization array antennas face challenges in minimizing intermodulation distortion and white noise while maintaining low polarization coupling over a wide band, which affects communication quality and channel capacity.
Innovation Solution
The design incorporates a first conductive member with antennas arranged at a specific interval, a second conductive member capacitively coupled to the first, and a partition plate with a coupling part configured to increase coupling between adjacent antennas, reducing intermodulation distortion and white noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual polarization antenna is used to improve communication quality and channel capacity, then the polarization coupling amounts among antennas transmitting and receiving different polarizations need to be kept low, but this may increase intermodulation distortion or white noise
Solution Approach 1:
The partition plate is divided into a partition part and a coupling part, where the partition part separates adjacent antennas to reduce polarization coupling, while the coupling part provides capacitive coupling to suppress intermodulation distortion. This segmentation allows independent optimization of each function.
Solution Approach 2:
Different parts of the partition plate have different functions: the partition part (extending in the arrangement direction of antennas) provides isolation between adjacent antennas, while the coupling part (extending in the width direction of the planar part) provides capacitive coupling. This local differentiation resolves the contradiction between reducing polarization coupling and suppressing intermodulation distortion.
2Object-generated harmful factors
If the coupling amount between the second conductive member and the first conductive member is increased to suppress intermodulation distortion, then the polarization coupling among antennas may increase
Solution Approach 1:
The partition plate is segmented into a partition part that extends in the arrangement direction of antennas (providing isolation) and a coupling part that extends in the width direction of the planar part (providing capacitive coupling). This segmentation allows the coupling part to increase coupling amount for suppressing intermodulation distortion without affecting the partition part's polarization isolation function.
Solution Approach 2:
The partition plate has an asymmetric structure where the partition part and coupling part extend in different directions and serve different functions. The partition part provides isolation while the coupling part provides capacitive coupling, allowing independent control of polarization coupling and intermodulation distortion suppression.
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 effectively suppresses intermodulation distortion and white noise while enhancing polarization coupling, improving communication quality and channel capacity by optimizing the arrangement and coupling of antennas.
Implementation Method 1
a second conductive member provided between the antennas adjacent to each other via a gap of a predetermined second interval to the planar part of the first conductive member, the second conductive member being capacitively coupled to the first conductive member
Data Source
AI summary
An array antenna is provided with: a first conductive member including a planar part; plural antennas arranged at a predetermined first interval to the planar part of the first conductive member, each of the plural antennas transmitting and receiving radio frequencies of a first polarization and radio frequencies of a second polarization that is different from the first polarization; and a second conductive member provided between the antennas adjacent to each other among the plural antennas via a gap of a predetermined second interval to the planar part of the first conductive member, the second conductive member being capacitively coupled to the first conductive member.