Capacitive Coupling Antenna for Miniaturization and Impedance Matching
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Solution Overview
Problem
Existing antenna designs face challenges in miniaturization while maintaining performance, particularly in achieving high polarization purity and omnidirectionality, as reducing antenna dimensions increases base impedance, making impedance matching difficult and leading to power losses and reduced bandwidth.
Innovation Solution
The antenna device employs a capacitive coupling mechanism with coupling points on the emitter element, allowing for reduced dimensions below half a wavelength while enabling low-loss impedance matching and eliminating the need for large ground surfaces and reflectors, using blade elements and bridge elements for capacitive coupling with a conductive pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If antenna dimensions are reduced for miniaturization, then the antenna size is decreased, but the base impedance increases making impedance matching difficult and causing power losses
Solution Approach 1:
The patent introduces coupling points as intermediary elements that capacitively couple the emitter element to the ground surface. These coupling points act as mediators that enable impedance matching for miniaturized antennas without requiring large ground surfaces or reflectors, thereby reducing power losses while maintaining small dimensions
Solution Approach 2:
The patent changes the coupling mechanism from traditional galvanic connections to capacitive coupling through coupling points. This parameter change in the coupling method allows the antenna to achieve proper impedance matching at reduced dimensions, preventing the increase in base impedance that would otherwise cause power losses
2Volume of moving object
If antenna dimensions are reduced below half a wavelength, then the antenna is miniaturized, but impedance matching becomes difficult requiring lossy matching elements
Solution Approach 1:
The coupling points serve as intermediaries that simplify impedance matching for miniaturized antennas. By providing capacitive coupling between the emitter element and ground, they enable straightforward impedance matching without requiring complex lossy matching elements or large ground surfaces
Solution Approach 2:
The patent moves the coupling connection from a planar ground surface connection to a vertical dimension through coupling points extending from the emitter element. This dimensional change allows impedance matching to be achieved through the height dimension rather than requiring large lateral ground surfaces
3Reliability
If large ground surfaces and reflectors are used to maintain performance, then polarization purity is improved, but the antenna size and complexity increase
Solution Approach 1:
The coupling points act as intermediaries that provide the necessary ground connection without requiring large ground surfaces or reflectors. This eliminates the need for complex ground structures while maintaining the polarization purity required for reliable antenna operation
Solution Approach 2:
The patent extracts the ground connection function from the traditional large ground surface and concentrates it into discrete coupling points. This extraction eliminates the need for extensive ground surfaces and reflectors while maintaining the essential grounding function for polarization purity
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 approach allows for reduced antenna dimensions with minimal performance loss, enabling targeted radiation properties and impedance matching, achieving a broader bandwidth and reducing the need for lossy matching elements and large ground surfaces.
Implementation Method 1
the coupling point is implemented for capacitively coupling electromagnetic signals in and/or out
Data Source
AI summary
The invention relates to an antenna device having an emitter element for emitting and/or receiving electromagnetic signals. The emitter element includes at least one coupling point connected to a side of the emitter element, and implemented for capacitively coupling electromagnetic signals in and/or out.