Dual-Polarized Antenna Array Using Perpendicular Microstrip Feeding
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Solution Overview
Problem
Existing antenna designs struggle to efficiently generate both left-hand and right-hand circularly polarized operating modes with good performance, particularly for applications in low-orbit satellite communications.
Innovation Solution
An antenna structure comprising a microstrip line group with perpendicular first and second microstrip lines, slots, and radiators, where phase differences between feeding ends generate left-hand and right-hand circularly polarized modes, with specific radiator and slot configurations optimized for frequency bands suitable for low-orbit satellite communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional antenna design is used, then the structure is simple, but it cannot efficiently generate both left-hand and right-hand circularly polarized modes with good performance
Solution Approach 1:
The antenna is divided into multiple functional segments: a microstrip line group with first and second microstrip lines for signal input, a first conducting layer with first and second slots for electromagnetic coupling, and first and second radiators for radiation. Each segment performs a specific function in generating left-hand or right-hand circularly polarized modes, allowing independent optimization of each component while achieving dual-mode performance.
Solution Approach 2:
Different regions of the antenna are designed with different properties: the microstrip lines have specific impedance characteristics for signal transmission, the slots have specific dimensions and orientations for coupling electromagnetic energy, and the radiators have specific geometries for efficient radiation. The first slot and second slot are positioned and dimensioned to selectively couple with the microstrip lines and excite the radiators in specific polarization modes.
2Reliability
If the antenna structure is optimized for good circularly polarized performance, then the performance improves, but the manufacturing complexity increases
Solution Approach 1:
The microstrip line group and first conducting layer are integrated into a single antenna assembly, with the microstrip lines positioned to correspond with the slots. The first and second radiators are combined in a configuration where they work together to generate both left-hand and right-hand circularly polarized modes. This integration reduces the number of separate components and simplifies manufacturing while maintaining performance.
Solution Approach 2:
The antenna structure is designed to perform multiple functions: it can generate left-hand circularly polarized modes when the first microstrip line is fed with a signal of a first phase and the second microstrip line is fed with a signal of a second phase, and it can generate right-hand circularly polarized modes when the phases are reversed. The same physical structure supports both operating modes, eliminating the need for separate antennas for different polarization modes.
3Reliability
If multiple radiators are used to generate different polarization modes, then the performance improves, but the device complexity increases
Solution Approach 1:
The antenna utilizes phase dynamic control to switch between left-hand and right-hand circularly polarized modes. By changing the phase relationship between the signals fed to the first and second microstrip lines (90 degrees for left-hand, -90 degrees for right-hand), the same radiator configuration can dynamically generate different polarization modes without physical reconfiguration.
Solution Approach 2:
The antenna employs a composite structure combining microstrip transmission lines with slot couplings and radiating elements. The microstrip lines provide controlled impedance and phase progression, the slots provide electromagnetic coupling and field transformation, and the radiators provide efficient radiation. This composite approach enables dual-mode operation within a unified structure.
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 antenna structure achieves efficient generation of both left-hand and right-hand circularly polarized modes with frequency bands within low-orbit satellite communication specifications, providing good performance and minimizing signal interference.
Implementation Method 1
first electromagnetic energy is coupled to the first slot and the second slot respectively through the first microstrip line and the second microstrip line
Implementation Method 2
generate a first frequency band of a left-hand circularly polarized operating mode
Implementation Method 3
then to the first radiator so as to generate a first frequency band of a left-hand circularly polarized operating mode
Data Source
AI summary
An antenna structure including a first grounding layer, a microstrip line group, a first conductive layer, a first radiator and a second radiator is provided. The microstrip line group is disposed above the first grounding layer and includes a first microstrip line and a second microstrip line perpendicular to each other. The first microstrip line includes a first feeding end. The second microstrip line includes a second feeding end. The first conductive layer is disposed above the microstrip line group and includes a first slot and a second slot perpendicular to each other. The first slot and the second slot correspond to the first microstrip line and the second microstrip line respectively. The first radiator is disposed above the first slot and the second slot. The second radiator is disposed above the first radiator.