Aperture Coupled Patch Antenna Thick Ground Plate
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Solution Overview
Problem
Conventional aperture coupled patch antennas face manufacturing difficulties and design limitations due to the use of thin ground planes, which restrict mechanical strength and design options, while also presenting challenges in efficiently coupling signals with low loss.
Innovation Solution
An aperture coupled patch antenna design featuring a ground plate with a slot aperture, where the thickness of the ground plate is greater than the slot width, allowing for low-loss signal coupling and providing mechanical strength, along with economical manufacturing options such as casting, and incorporating features like termination cavities and air gaps to enhance coupling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thin ground plane is used in conventional aperture coupled patch antennas, then signal coupling can be achieved, but mechanical strength is restricted and manufacturing options are limited
Solution Approach 1:
The patent changes the thickness parameter of the ground plane from conventional thin (e.g., 1.6mm PCB) to thick (e.g., 6mm or more), fundamentally altering the structural and electromagnetic characteristics. This parameter change enables both improved mechanical strength and reduced RF loss through optimized aperture coupling
Solution Approach 2:
The invention transitions from a two-dimensional thin ground plane to a three-dimensional thick ground plate structure. This dimensional change allows the aperture to be positioned optimally within the thickness for both mechanical support and electromagnetic performance, resolving the contradiction between strength and RF loss
2Strength
If a thick ground plate is used to provide mechanical strength, then structural strength is improved, but signal coupling loss increases
Solution Approach 1:
The patent applies local quality by creating an aperture (slot or hole) in the thick ground plate at a specific location and orientation. This localized modification allows the bulk of the ground plate to maintain its thickness for structural strength, while the aperture provides the necessary electromagnetic coupling path with minimized RF loss
Solution Approach 2:
The aperture acts as an intermediary structure that mediates between the thick ground plate and the radiating elements. It provides a controlled electromagnetic coupling path that enables signal transmission through the thick ground plate while minimizing losses, thus resolving the contradiction between structural strength and coupling efficiency
3Ease of manufacture
If a thin ground plane is used for aperture coupling, then signal coupling is achieved, but manufacturing difficulties arise
Solution Approach 1:
Changing the ground plane thickness from thin to thick enables the use of conventional manufacturing processes like casting and machining that are better suited for thick structures. These processes can more easily achieve precise aperture positioning and maintain dimensional stability compared to working with thin ground planes
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 design achieves robust and cost-effective antenna implementation with low radiofrequency loss, enabling the use of thick ground plates for structural strength and efficient signal coupling, while maintaining compactness and reduced manufacturing costs.
Implementation Method 1
An aperture may be provided in the ground plane, in a so called aperture coupled patch antenna, arranged so that signals are coupled from the feed track or tracks to the patch radiator through the aperture
Data Source
AI summary
An aperture coupled patch antenna element comprises a ground plate having an aperture passing through the ground plate from a first side to a second opposite side. The aperture comprises a slot having an elongate cross-section, the cross-section having substantially parallel sides extending along the length of the cross-section. The antenna element also comprises a first transmission line comprising a first elongate conductor disposed on the first side of the ground plate in a substantially parallel relationship with the first side of the ground plate, and a patch radiator disposed on the second side of the ground plate in a substantially parallel relationship with the second side of the ground plate, the first transmission line being arranged to cross the slot, and the patch radiator being arranged to overlie the slot. The thickness of the ground plate at the slot is greater than the width of the slot.