Dielectric Cavity Antenna Size Reduction via Metal Pattern Coupling
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Solution Overview
Problem
There is a need to reduce the size of dielectric cavity antennas without altering their bandwidth or resonance frequency, particularly for applications in the 60 GHz band where mass data transmission systems require smaller system modules.
Innovation Solution
A dielectric cavity antenna design incorporating a multilayer substrate with a dielectric cavity and a metal pattern that is electromagnetically coupled to a feed line, allowing for impedance adjustment and reducing the size of the antenna by approximately 14% while maintaining resonance frequency and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of dielectric cavity antenna is reduced, then the system module size is reduced, but the bandwidth or resonance frequency changes
Solution Approach 1:
The patent introduces a metal pattern with specific geometric parameters (width, length, position) within the dielectric cavity to adjust the resonant frequency and impedance characteristics. By changing the parameters of the metal pattern, the antenna maintains its resonant frequency and bandwidth while achieving size reduction. The metal pattern acts as a resonant element that compensates for the size reduction effects.
Solution Approach 2:
The patent combines dielectric material (substrate) with metal pattern elements to create a composite antenna structure. This composite structure allows the antenna to achieve size reduction while maintaining electromagnetic performance through the synergistic interaction between the dielectric cavity and metal resonant elements.
2Reliability
If the metal pattern is added to adjust impedance, then the impedance matching is improved, but the device complexity increases
Solution Approach 1:
The patent merges the impedance matching function with the resonant element (metal pattern) into a single integrated structure. The metal pattern serves dual purposes: it acts as the resonant element that determines the operating frequency and simultaneously provides impedance transformation to achieve 50Ω matching. This eliminates the need for separate impedance matching circuits or structures.
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 achieves a reduced size without compromising performance, enabling efficient electromagnetic wave signal radiation and heat dissipation, and maintaining 50Ω matching at the desired frequency.
Implementation Method 1
a dielectric cavity inserted into the multilayer substrate to radiate an electromagnetic wave signal through the opening
Implementation Method 2
at least one metal pattern formed in an inner portion of the dielectric cavity or on a surface thereof to thereby be electromagnetically coupled to the feed line. The metal pattern electromagnetically coupled to the feed line is changed, such that impedance formed by the feed line and the metal pattern may be changed
Implementation Method 3
a plurality of metal vias arranged along a circumference of the opening to be spaced apart from each other by predetermined intervals and vertically penetrating the multilayer substrate to thereby electrically connect the plurality of conductor plates to each other
Data Source
AI summary
There is provided a dielectric cavity antenna including: a multilayer substrate having an opening formed in at least a portion of a predetermined surface thereof; a dielectric cavity inserted into the multilayer substrate to radiate an electromagnetic wave signal through the opening; a feed line feeding power to the dielectric cavity; and at least one metal pattern formed in an inner portion of the dielectric cavity or on a surface thereof to thereby be electromagnetically coupled to the feed line.