Cavity-Backed Dipole Antenna Layers for Smaller Cavities
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Solution Overview
Problem
Existing cavity backed dipole antenna structures tend to be large and heavy due to the need for larger cavity sizes to achieve desired parameters such as gain and bandwidth, and reducing cavity size often results in degradation of these parameters.
Innovation Solution
The use of a cavity backed dipole antenna structure with a plurality of layers of a first dielectric material stacked above a lower conductive plate, where any two adjacent layers of the first dielectric material are separated by a second dielectric material that is compositionally different, allowing for a reduction in cavity size without sacrificing gain and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the cavity size is reduced to make the antenna smaller and lighter, then the weight and dimensions of the antenna are improved, but the gain and bandwidth parameters deteriorate
Solution Approach 1:
The patent uses a composite dielectric structure with multiple layers of different dielectric materials (first dielectric material with higher permittivity and second dielectric material with lower permittivity) to achieve the desired electromagnetic performance in a reduced cavity size. This composite approach allows optimization of both weight and performance parameters simultaneously.
Solution Approach 2:
The patent changes the electromagnetic parameters of the cavity by introducing multiple dielectric layers with different permittivity values. This alters the resonant characteristics and impedance matching of the antenna, enabling it to maintain gain and bandwidth performance while operating in a smaller, lighter cavity structure.
2Volume of stationary object
If the cavity size is reduced to fit smaller spaces, then the volume and dimensions of the antenna are improved, but the gain and bandwidth parameters deteriorate
Solution Approach 1:
The patent employs a composite dielectric structure with multiple layers of different dielectric materials (first dielectric material with higher permittivity and second dielectric material with lower permittivity) to achieve the desired electromagnetic performance in a reduced cavity size. This composite approach allows optimization of both volume and performance parameters simultaneously.
Solution Approach 2:
The patent changes the electromagnetic parameters of the cavity by introducing multiple dielectric layers with different permittivity values. This alters the resonant characteristics and impedance matching of the antenna, enabling it to maintain gain and bandwidth performance while operating in a smaller, lighter cavity structure.
3Device complexity
If a single dielectric material is used in the cavity, then the device complexity is reduced, but the ability to maintain gain and bandwidth in smaller cavities is limited
Solution Approach 1:
The patent uses a composite dielectric structure with multiple layers of different dielectric materials (first dielectric material with higher permittivity and second dielectric material with lower permittivity) to achieve the desired electromagnetic performance in a reduced cavity size. This composite approach allows optimization of both weight and performance parameters simultaneously.
Solution Approach 2:
The patent applies different dielectric materials in specific locations within the cavity - the first dielectric material in certain regions and the second dielectric material in other regions. This local differentiation optimizes the electromagnetic field distribution to maintain gain and bandwidth while reducing overall cavity size.
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 a smaller and lighter antenna structure while maintaining the desired parameters of gain and bandwidth, enabling the antenna to be used in smaller spaces and potentially retrofitted into larger conventional antenna structures.
Implementation Method 1
the first dielectric material has relatively high relative magnetic permeability in the frequency range of interest
Implementation Method 2
the second material has relatively low dielectric constant
Data Source
AI summary
A cavity backed antenna assembly includes a conductive lower wall and two or more conductive side walls at least in part defining a cavity. The antenna assembly further includes a first layer and a second layer each including a first dielectric material above the lower wall and within the cavity, and a third layer including a second dielectric material between and separating the first and second layers. In an example, the second dielectric material compositionally different from the first dielectric material. The antenna assembly further includes a first conductive structure and a second conductive structure separated by a third dielectric material, wherein the first conductive structure and the second conductive structure are within the cavity and above the first and second layers. In an example, the first dielectric material a relative magnetic permeability of at least 1 for a frequency between 10 MHz and 1 GHz.