Multi-band Transmit Antenna for Wireless Power Transfer
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Solution Overview
Problem
Conventional wired charging methods for electronic devices are inconvenient and inefficient, as they require physical connections and may not efficiently transfer power over larger distances, leading to increased power consumption and frequent recharging needs.
Innovation Solution
A wireless power transfer system utilizing a transmitting antenna configured to operate over multiple frequency bands, including active and passive antennas that provide efficient energy transfer by creating a resonant coupling mode between the transmitter and receiver, allowing power to be transmitted through free space with minimal loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wired charging connections are used, then power transfer reliability is ensured, but ease of operation deteriorates due to physical connection requirements
Solution Approach 1:
The patent replaces the mechanical wired connection system with a wireless electromagnetic field-based power transfer system. The transmitting antenna generates electromagnetic fields that couple with the receiving antenna, eliminating the need for physical cable connections while maintaining power transfer functionality. This substitution resolves the contradiction by improving ease of operation (no physical connection needed) while ensuring reliability through resonant coupling mechanisms.
Solution Approach 2:
The patent introduces electromagnetic fields as an intermediary medium to transfer power between the transmitting and receiving antennas. The electromagnetic field acts as a mediator that carries energy through free space without requiring direct physical contact, thus improving ease of operation while maintaining reliable power transfer through field coupling.
2Ease of operation
If wireless power transfer over larger distances is implemented, then ease of operation improves, but energy loss increases
Solution Approach 1:
The patent employs resonant oscillation at specific frequencies (e.g., 13.56 MHz) in both transmitting and receiving antennas to enhance energy transfer efficiency. By tuning the antennas to resonate at the same frequency, the system creates a strong coupling effect that maintains efficient power transfer over larger distances, thereby reducing energy loss while preserving the ease of wireless operation.
Solution Approach 2:
The patent optimizes multiple parameters including operating frequency, antenna quality factor (Q), and coupling distance to minimize energy loss. By adjusting these parameters, the system achieves efficient power transfer over larger distances without proportionally increasing energy loss, thus resolving the contradiction between ease of operation and energy efficiency.
3Adaptability or versatility
If multi-band frequency operation is implemented, then adaptability improves, but device complexity increases
Solution Approach 1:
The patent designs the transmitting antenna to operate across multiple frequency bands (e.g., LF, MF, HF, VHF, UHF) using a single multi-band antenna structure. This universal design allows the same antenna to serve multiple communication and power transfer functions across different standards and applications, improving adaptability while avoiding the need for multiple separate antennas that would increase device complexity.
Solution Approach 2:
The patent employs dynamically adjustable impedance matching networks and frequency tuning mechanisms that allow the antenna system to adapt to different operating frequencies. This dynamic adjustment capability enables multi-band operation with a single antenna structure, improving versatility without requiring complex fixed multi-antenna systems.
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 and convenient wireless charging of electronic devices over larger distances by minimizing energy loss and allowing power transfer without physical connections, improving charging efficiency and reducing the need for frequent recharging.
Implementation Method 1
a transmitting antenna including an active antenna configured to transmit a field over a plurality of operating frequencies
Implementation Method 2
active and passive antennas that provide efficient energy transfer by creating a resonant coupling mode between the transmitter and receiver
Data Source
AI summary
This disclosure provides systems, methods and apparatus for tuning a transmit antenna for operation in a plurality of frequency bands. In one aspect, a transmitting antenna system is provided. The transmitting antenna system includes an active transmit antenna and a tunable passive antenna. The active antenna is configured to transmit a field over a plurality of operating frequencies. The passive antenna is configured to transmit a field over at least two frequencies of the plurality of operating frequencies. In one aspect, the tunable passive antenna includes a network of a plurality of reactive elements. In another aspect, the plurality of operating frequencies is selected from a set including a charging frequency, an NFC frequency, and a communication frequency.