Parallel Plate Antenna Compact Design Near Conducting Surfaces
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Solution Overview
Problem
Compact antennas face challenges in operating effectively on or near electrically conducting surfaces due to electromagnetic field leakage, which affects their shielding effectiveness.
Innovation Solution
A compact parallel plate antenna design with stacked horizontal and vertical plates, where alternating horizontal plates are electrically coupled to one of the vertical plates, mounted on a planar flange, with dimensions approximately one-thirtieth of a wavelength, allowing operation near conducting surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a compact antenna is designed for operation on or near electrically conducting surfaces, then the antenna size is reduced, but electromagnetic field leakage increases reducing shielding effectiveness
Solution Approach 1:
The antenna is divided into multiple discrete parallel plates (at least three plates) spaced apart from each other, rather than using a continuous structure. This segmentation allows the antenna to maintain compact dimensions while reducing electromagnetic field leakage through the gaps between plates, thereby resolving the contradiction between small size and shielding effectiveness.
Solution Approach 2:
Dielectric material is introduced as an intermediary substance filling the spaces between the parallel plates. This dielectric mediator enhances the shielding effectiveness by controlling electromagnetic field distribution while maintaining the compact antenna structure, addressing the field leakage issue without increasing overall antenna volume.
2Length of moving object
If the antenna dimensions are reduced to one-thirtieth of a wavelength, then compactness is achieved, but radiation efficiency may deteriorate
Solution Approach 1:
The antenna transitions from a traditional linear dipole structure to a multi-dimensional parallel plate configuration. By arranging multiple plates in parallel with spacing between them, the antenna achieves compact dimensions (λ/30) while maintaining effective radiation through the distributed plate structure, resolving the contradiction between size reduction and radiation efficiency.
Solution Approach 2:
The antenna combines conducting materials (for the plates) with dielectric materials (filling the spaces between plates) to create a composite structure. This composite design enables the antenna to maintain compact dimensions while the dielectric material enhances electromagnetic field confinement and radiation efficiency, addressing the reliability concern.
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 design provides a compact solution with enhanced performance on conducting surfaces, achieving effective radiation patterns and reduced electromagnetic leakage, suitable for portable applications.
Implementation Method 1
A compact antenna that has the ability to operate on or near electrically conducting surfaces
Implementation Method 2
The shielding effectiveness (SE) of a metallic enclosure is an important figure of merit that describes the degree of protection against electromagnetic field leakage into or out of the structure
Data Source
AI summary
The invention as disclosed is a parallel plate antenna having a number of stacked horizontal plates and two vertical plates. Alternating ones of the horizontal plates are electrically coupled to one vertical plate such that the horizontal plates coupled to one vertical plate are interleaved with the horizontal plates coupled to the other vertical plate. The assembled antenna is mounted on a planar mounting flange. The height/width of the antenna is approximately 1/30th of a wavelength at the frequency of operation.