Waveguide Slotted Array Antenna with Four-Stack Radiation Units
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Solution Overview
Problem
Traditional waveguide slotted array antennas face challenges in achieving low sidelobes, high gains, and broad bandwidth while maintaining a low profile and cost, with existing solutions either compromising on gain or increasing production costs and complexity.
Innovation Solution
The design incorporates a feed layer and a radiation layer with specific arrangements of radiation units and matching plates, along with H-shaped single ridge waveguide power division networks and converters, to reduce structural size, enhance broadband transmission, and eliminate the need for a polarization layer, achieving low sidelobes and high gains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a polarization layer is added to lower sidelobes, then sidelobe level is reduced, but manufacturing cost increases by 20%
Solution Approach 1:
The invention removes the polarization layer from the antenna structure while achieving low sidelobes through a different mechanism. The four-stack radiation units with specific phase differences (0°, 90°, 180°, 270°) and the feed network design eliminate the need for the polarization layer, reducing manufacturing cost by 20% while maintaining low sidelobe performance.
Solution Approach 2:
The feed network and radiation unit design serve multiple functions simultaneously: they provide power distribution, phase control, and sidelobe suppression without requiring the additional polarization layer. The H-shaped waveguide power division network and four-stack configuration achieve what previously required separate components.
2Device complexity
If traditional waveguide slotted array antenna designs are used, then结构简单性 is maintained, but bandwidth is limited and cannot achieve ultra-wideband performance
Solution Approach 1:
The radiation layer is divided into four independent stack units, each with its own feed network and phase characteristics. This segmentation allows each unit to operate over different frequency ranges, and their combined effect achieves ultra-wideband performance while maintaining relatively simple individual structures.
Solution Approach 2:
The invention transitions from a traditional planar slot array to a three-dimensional four-stack configuration. By stacking radiation units vertically and controlling their phases, the antenna achieves broadband performance through spatial diversity while keeping each individual unit structurally simple.
3Adaptability or versatility
If waveguide wide sides are made large to accommodate low frequency operation, then low frequency coverage is achieved, but antenna size increases and small size cannot be ensured
Solution Approach 1:
The invention uses vertical stacking of four radiation units to extend frequency coverage rather than increasing the horizontal width of waveguides. This three-dimensional configuration allows low frequency operation while maintaining a compact overall size, as the frequency diversity is achieved through the stacked arrangement and phase control rather than large waveguide dimensions.
4Adaptability or versatility
If micro-strip array antennas are used to achieve broad bands, then bandwidth is increased, but insert loss increases due to conductor and dielectric losses at high frequencies
Solution Approach 1:
The invention replaces micro-strip transmission lines with waveguide structures for power distribution. Waveguides have significantly lower conductor and dielectric losses compared to micro-strip lines, especially at high frequencies. This substitution maintains broadband performance while reducing insert loss, making the antenna suitable for high-frequency applications.
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 allows for high-efficiency, ultra-wideband performance with reduced sidelobes and antenna size, facilitating easy machining, assembly, and cost-effective volume production.
Implementation Method 1
H-shaped single ridge waveguide power division networks
Implementation Method 2
power division networks...form a first-level feed network array
Implementation Method 3
first matching plates are separately arranged in the middle of the front side wall and the middle of the rear side wall of each radiation cavity
Implementation Method 4
radiation cavities which are arranged at intervals...distributed on the first flat metal plate in n rows and n columns
Implementation Method 5
the polarization direction of an electric field can deflect in the rotating direction of a metal strip, the energy of a square array antenna in the diagonal direction can well distributed conically
Implementation Method 6
directional patterns of the E plane and the H plane of antennas can be optimized
Data Source
AI summary
A waveguide slotted array antenna comprises a feed layer and a radiation layer, wherein the feed layer is located below the radiation layer, and the radiation layer comprises a first radiation unit, a second radiation unit, a third radiation unit and a fourth radiation unit which are stacked from bottom to top; the first radiation unit comprises a first flat metal plate and a first radiation array arranged on the first flat metal plate, the second radiation unit comprises a second flat metal plate and a second radiation array arranged on the second flat metal plate, the third radiation unit comprises a third flat metal plate and a third radiation array arranged on the third flat metal plate, and the fourth radiation unit comprises a fourth flat metal plate and a fourth radiation array arranged on the fourth flat metal plate. The waveguide slotted array antenna has the advantages of low sidelobes and low cost while ensuring broad bands and high gains, and can be made small.