Meander-Line Microstrip Antenna for Low-Frequency Wireless Power
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Solution Overview
Problem
Existing antennas fail to effectively operate at low frequencies in the near-field, leading to issues like low gain, impedance changes, uneven power distribution between electric and magnetic fields, and low radiation resistance, making them unsuitable for wireless power transmission to small devices.
Innovation Solution
A microstrip 'meander line' electrical antenna is designed with specific geometry, materials, and parameters to optimize magnetic permeability and permittivity, allowing for cancellation of parasitic reactances and efficient power capture and transmission across a wide frequency range, particularly between 100 kHz and 200 MHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional antennas are used for wireless power transmission at low frequencies, then the antenna can be manufactured with standard designs, but the gain is low and power distribution between electric and magnetic fields is uneven
Solution Approach 1:
The patent applies parameter changes by carefully selecting and adjusting the dimensions of the microstrip antenna (length, width, feed position) to achieve resonance at specific low frequencies. The antenna dimensions are optimized to control the distribution between electric and magnetic fields, ensuring equal power distribution and enhanced gain for wireless power transmission applications.
Solution Approach 2:
The patent utilizes composite material structures by combining microstrip conductive layers with dielectric substrates to create a resonant cavity that supports both electric and magnetic field components. This composite structure enables the antenna to achieve high gain and balanced field distribution at low frequencies, resolving the contradiction between power availability and reliability.
2Ease of manufacture
If antennas are designed for far-field operation, then conventional mathematical tools can be applied, but the wave impedance changes with distance and power distribution is uneven
Solution Approach 1:
The patent applies dynamics by designing the antenna to operate in the near-field region where the electromagnetic environment is dynamic and distance-dependent. The antenna structure is optimized to maintain stable impedance characteristics despite variations in operating distance, using resonant structures that adapt to near-field conditions rather than far-field assumptions.
Solution Approach 2:
The patent changes the operating parameters from far-field to near-field conditions, adjusting the antenna dimensions and feed configuration to achieve impedance stability in the reactive near-field region. This allows the use of conventional manufacturing techniques while maintaining reliable impedance characteristics through careful parameter optimization.
3Volume of moving object
If the antenna dimensions are reduced for small devices, then the device size decreases, but the radiation resistance becomes low and power transmission efficiency drops
Solution Approach 1:
The patent applies dimensionality change by transitioning from traditional planar antenna designs to a microstrip structure that utilizes the third dimension (vertical layering with ground planes). This allows the antenna to achieve adequate radiation resistance in a compact form factor suitable for small devices, overcoming the limitation of reduced radiation resistance in miniaturized antennas.
Solution Approach 2:
The patent uses composite material structures with microstrip conductors on dielectric substrates with ground planes to enhance radiation resistance in small form factors. The layered composite structure creates resonant modes that maintain adequate radiation resistance despite the reduced overall dimensions, enabling efficient power transmission in compact devices.
4Ease of manufacture
If standard microstrip antenna designs are used, then manufacturing is simplified, but parasitic reactances cannot be cancelled and frequency range is limited
Solution Approach 1:
The patent applies parameter changes by optimizing the microstrip antenna dimensions (length, width, feed position) to achieve resonance across a wide frequency range from 100 kHz to 200 MHz. The design parameters are carefully selected to cancel parasitic reactances and achieve broadband operation while maintaining compatibility with standard manufacturing processes.
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 higher power availability, more linear power density, even energy distribution, and reduced wave attenuation, enabling efficient wireless power transmission to small devices, such as smartphones and laptops.
Implementation Method 1
capable of acting to capture power from an external medium in a wireless manner and subsequent transmission of the power captured
Data Source
AI summary
A microstrip electrical antenna (1) and its respective method of manufacturing, wherein the antenna (1) is of the electrically small kind being configured based on at least one wave parameter with which it will be operated. The present disclosure also refers to an equipment endowed with the electrical antenna (1).