Multi-band Antenna with Dielectric Substrate and LC Resonator
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Solution Overview
Problem
Existing antenna apparatuses face efficiency degradation due to electromagnetic coupling with metal parts and housings, especially when size constraints require closer proximity, leading to reduced radiation efficiency.
Innovation Solution
A small antenna apparatus design featuring a dielectric substrate with overlapping radiation elements and through-hole conductors, forming an LC resonator and inverted-F configuration, which minimizes electromagnetic coupling and allows operation across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna apparatus is placed closer to metal parts and housing to reduce device size, then the device dimensions are reduced, but the radiation efficiency deteriorates due to increased electromagnetic coupling
Solution Approach 1:
A dielectric substrate is introduced as an intermediary material between the antenna apparatus and the metal parts/housing. This dielectric layer acts as a mediator that reduces electromagnetic coupling between the antenna and conductive structures, thereby maintaining radiation efficiency while allowing the antenna to be positioned closer to the housing for compact device design.
Solution Approach 2:
The invention utilizes the dielectric properties (permittivity) of the substrate material to control electromagnetic field distribution. By selecting and positioning the dielectric substrate with appropriate parameters, the electromagnetic coupling between the antenna and metal parts is reduced, enabling compact form factor without sacrificing radiation efficiency.
2Adaptability or versatility
If the antenna apparatus is designed for multiple frequency bands, then the versatility is improved, but the device complexity increases
Solution Approach 1:
The antenna apparatus is designed with a universal structure that can operate across multiple frequency bands (e.g., 700 MHz, 1.5 GHz, 2.1 GHz, 3.5 GHz, 5 GHz). The same antenna element and dielectric substrate configuration serve multiple functions by supporting resonance at different frequencies, eliminating the need for separate antenna elements for each band and thereby reducing overall device complexity.
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 high radiation efficiency and operates in multiple bands with a compact size, effectively utilizing space and reducing electromagnetic interference with metal parts and housings.
Implementation Method 1
The first radiation element is capacitively coupled to the second radiation element in the portion where the first and second radiation conductors overlaps with each other via the dielectric substrate
Implementation Method 2
an LC resonator is formed of the meander portion, and the portion where the first and second radiation elements are capacitively coupled to each other
Data Source
AI summary
An antenna apparatus is provided with a dielectric substrate, a feed point, a first radiation conductor, a second radiation conductor, and a through-hole conductor. The first radiation element is capacitively coupled to the second radiation element in a portion where the first and second radiation conductors overlaps with each other via the dielectric substrate. At least one of the first and second radiation elements has a meander portion formed in the portion where the first and second radiation elements are capacitively coupled to each other, and an LC resonator is formed of the meander portion, and the portion where the first and second radiation elements are capacitively coupled to each other.