Slot Antenna Device Multi-Frequency Operation
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Solution Overview
Problem
Current slot antenna designs for wireless charging are complex and costly due to the need for multiple-slot structures to operate at multiple frequency bands, which complicates the design and manufacturing of wireless charging devices.
Innovation Solution
A single-slot antenna device with a substrate and metal layer, where the slot's length is the sum of quarter wavelengths of multiple frequency bands, allowing operation across multiple frequency bands using a single feeding element and slot structure, which can be linear or curved, and is adaptable to flexible substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multiple-slots structure is designed to operate at multiple frequency bands, then the antenna can support multiple charging frequency bands, but the slot antenna structure becomes complicated and manufacturing cost increases
Solution Approach 1:
The patent applies universality by designing a single slot antenna structure that can operate across multiple frequency bands (915 MHz, 2.45 GHz, and 5.25 GHz) through impedance transformation networks. Instead of creating separate slots for each frequency band, the invention makes one slot structure perform multiple frequency functions by using transmission line transformations and impedance matching networks that enable the same physical slot to resonate at different frequencies.
Solution Approach 2:
The patent employs parameter changes by modifying the electrical characteristics of the slot antenna through impedance transformation networks. By changing the impedance parameters and using transmission line transformations, the same slot structure can be tuned to operate at different frequency bands. The invention transforms the slot's electrical length and impedance characteristics to achieve multi-frequency operation without changing the physical slot geometry.
2Adaptability or versatility
If a multiple-slots structure is designed to operate at multiple frequency bands, then the antenna can support multiple charging frequency bands, but the design and manufacturing cost increases
Solution Approach 1:
The patent applies merging by combining multiple frequency band functions into a single slot structure. Instead of manufacturing separate slots for different frequency bands, the invention merges the functionality of multiple slots into one, using impedance transformation networks to achieve multi-frequency operation. This reduces the number of manufacturing steps, materials required, and assembly operations.
Solution Approach 2:
The patent makes a single slot structure universal by enabling it to operate at multiple frequency bands through impedance transformation. This universality simplifies manufacturing by eliminating the need to produce and assemble multiple different slot structures, reducing production complexity and cost while maintaining the ability to support multiple charging frequency bands.
3Device complexity
If a single-slot structure is used, then the design and manufacturing cost is reduced, but the antenna cannot operate at multiple frequency bands
Solution Approach 1:
The patent introduces an intermediary element - the impedance transformation network - that mediates between the single slot structure and multiple frequency bands. This intermediary network of transmission lines and impedance transformers enables the simple single slot to couple with and resonate at multiple different frequencies, bridging the gap between structural simplicity and frequency versatility.
Solution Approach 2:
The patent uses parameter changes in the impedance transformation network to enable the single slot to operate at multiple frequencies. By transforming the electrical parameters (impedance, electrical length) of the transmission lines connected to the slot, the same physical slot can be made to resonate at different frequency bands, achieving multi-frequency adaptability without increasing structural 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
Enables efficient operation across multiple wireless charging frequency bands, such as 915 MHz, 2.45 GHz, and 5.25 GHz, with reduced structural complexity and cost, while maintaining effective impedance matching and frequency bandwidth properties.
Implementation Method 1
A length of the slot is a sum of each quarter wavelength of at least three frequency bands, so that the slot antenna device is operated at the at least three frequency bands
Data Source
AI summary
A slot antenna device including a substrate, a metal layer and a feeding element is provided. The substrate has a first surface and a second surface opposite to the first surface. The metal layer is disposed on the first surface, and includes a slot extending along a first direction. The feeding element is disposed on the second surface, and extended along a second direction, where the first direction is perpendicular to the second direction. A length of the slot is a sum of each quarter wavelength of at least three frequency bands, so that the slot antenna device is operated at the at least three frequency bands. A projection of the feeding element on the first surface crosses the slot, so that the slot is divided into a first section and a second section, where a length of the first section is equal to a length of the second section.