Backscatter RFID Antenna with Yoke-Shaped Trace for Impedance Matching
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Solution Overview
Problem
Existing RFID transponders with backscatter-based systems face challenges in achieving long-range, wide-band, and omnidirectional reception of high-frequency radio signals due to power losses and the need for separate matching circuits, which increase complexity and cost.
Innovation Solution
The design of an antenna with two branches connected by a yoke-shaped trace segment, featuring U-shaped and serpentine trace segments, allows for a capacitive to inductive impedance match, eliminating the need for separate matching circuits and optimizing area utilization, enabling simpler, more economical, and longer-range transponders with wide-band omnidirectional reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate matching circuits are used to match capacitive antenna impedance to inductive receive circuit impedance, then impedance matching is achieved, but device complexity and cost increase
Solution Approach 1:
The patent combines the impedance matching function directly into the antenna structure by using a yoke-shaped trace segment connecting two antenna branches. This integrated approach eliminates the need for separate matching circuits while achieving the required capacitive to inductive impedance transformation, thereby reducing device complexity and cost.
Solution Approach 2:
The antenna structure serves multiple functions simultaneously: it provides both the radiating element and the impedance matching network. The yoke-shaped trace segment performs dual roles as both a structural connector and an impedance transforming element, making the antenna a multi-functional component that reduces overall system complexity.
2Reliability
If separate matching circuits are used for impedance matching, then impedance transformation is achieved, but manufacturing cost increases
Solution Approach 1:
The impedance matching function is merged into the antenna trace structure itself, eliminating the need for additional matching circuit components. This reduction in component count directly lowers manufacturing costs while maintaining reliable impedance transformation from capacitive antenna impedance to inductive receive circuit impedance.
3Device complexity
If conventional antenna designs are used, then simple structure is maintained, but power losses increase and reception range is limited
Solution Approach 1:
The antenna is divided into two distinct branches connected by a yoke-shaped trace segment. This segmentation allows each branch to be optimized for specific functions while the yoke connector provides efficient impedance transformation, reducing overall power losses and extending reception range without significantly increasing structural complexity.
4Length of moving object
If antenna design optimizes for long-range reception, then reception distance increases, but area utilization becomes inefficient
Solution Approach 1:
The yoke-shaped trace segment introduces a new spatial dimension to the antenna design, allowing the antenna branches to be positioned closer together while maintaining effective impedance transformation. This dimensional approach enables long-range reception capability within a compact area, optimizing both reception distance and area utilization.
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
This antenna configuration reduces power losses, allows for very long-range and wide-band reception, and simplifies the implementation of RFID transponders, achieving ranges of up to 10 meters while maintaining cost-effectiveness and flexibility in placement.
Implementation Method 1
an antenna for receiving the radio signal emitted by the base station
Implementation Method 2
a backscattering-based method is generally used for data transmission from a transponder to the base station, in the course of which a portion of the energy from the base station arriving at the transponder is reflected (backscattered)
Data Source
AI summary
An antenna for a backscatter-based RFID transponder is provided that has an integrated receive circuit having a capacitive input impedance for receiving a radio signal spectrally located in an operating frequency range. The antenna includes two antenna branches that extend outward from a connecting region in which the antenna branches can be connected to the integrated receive circuit, and a yoke-shaped first trace segment that is designed to connect the two antenna branches together. Each antenna branch can have a U-shaped second trace segment connected to the connecting region, and a U-shaped third trace segment connected to the second trace segment and extending parallel to the second trace segment. The invention further relates to a backscatter-based RFID transponder with such an antenna.