Dual Polarized Loop Antenna for Simultaneous RFID Power and Data
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Solution Overview
Problem
Existing wireless communication systems for RFID tags lack the capability to simultaneously transmit radio frequency (RF) power and data communication using dual polarization, which limits their efficiency and range in wireless power transmission.
Innovation Solution
A dual polarized loop antenna system with isolated signal feedpoints separated by a quarter of the loop's circumference, allowing for simultaneous data communication and power transmission by using one polarization for power and another for data, enabling the use of radio frequency (RF) power and communications link on the same frequency or spaced apart frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single antenna is used for both power transmission and data communication, then device complexity is reduced, but the capability to simultaneously transmit power and data with dual polarization is lost
Solution Approach 1:
The antenna is segmented into two distinct feedpoints (first and second feedpoints) positioned at different locations on the antenna structure. Each feedpoint is independently connected to separate transmission lines, allowing independent excitation of orthogonal polarization modes. This segmentation enables the antenna to simultaneously support both power transmission and data communication with dual polarization without requiring multiple separate antenna structures.
Solution Approach 2:
The single antenna structure is designed to perform multiple functions: it can transmit power, communicate data, and support both horizontal and vertical polarizations simultaneously. The antenna structure itself serves as a multi-functional platform where different feedpoints and transmission lines enable diverse operational modes (power-only, data-only, or combined power and data transmission) without requiring separate dedicated structures for each function.
2Reliability
If separate antennas are used for power transmission and data communication, then functional isolation is improved, but device complexity and integration difficulty increase
Solution Approach 1:
The patent merges the power transmission antenna and data communication antenna into a single integrated antenna structure. The first and second feedpoints are both connected to the same antenna body, allowing simultaneous excitation of orthogonal polarization modes. The transmission lines are coupled to the antenna at distinct feedpoints, enabling independent control of power and data channels while sharing the same radiating structure, thus reducing overall system complexity and integration requirements.
3Productivity
If dual linear polarization channels are implemented, then frequency reuse capability is improved, but antenna structure complexity increases
Solution Approach 1:
The antenna structure is segmented with distinct feedpoints positioned at specific locations (e.g., opposite sides of the antenna) to independently excite horizontal and vertical polarization modes. Each feedpoint connects to separate transmission lines that can be independently controlled, enabling frequency reuse through polarization diversity without requiring complex multi-element antenna arrays or sophisticated feeding networks.
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 dual polarized loop antenna system provides increased gain and efficiency in wireless power transmission and data communication, enabling real-time operation with simultaneous power and communication on the same frequency, addressing range limitations in RFID devices and potentially other wireless communication devices.
Implementation Method 1
wireless power transmission can be the conveyance of electrical energy by radio frequency (RF) techniques, such as the electric power transmitted and received between two radio antennas
Implementation Method 2
Polarization refers to the orientation of the E field in the radiated wave, and if the E field vector rotates in time, the wave is then said to be rotationally or circularly polarized
Data Source
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AI summary
The wireless communication system (100) includes a first device (102), e.g., a radio frequency identification (RFID) reader, having a wireless power transmitter (104), a first wireless data communications unit (106), and a first dual polarized loop antenna (110) having isolated signal feedpoints (114, 116) along a first loop electrical conductor (112). The wireless power transmitter (104) transmits a power signal having a first polarization, and the first wireless data communications unit (106) communicates using a data signal having a second polarization. A second device (202), e.g., an RFID tag, includes a second dual polarized loop antenna (210). A second wireless data communications unit (206) communicates with the first wireless data communications unit (106) of the first device (102) using the data signal having the second polarization. A wireless power receiver (204) receives the power signal having the first polarization from the wireless power transmitter (104) of the first device (102), and provides power for the second device (202).