Compact Patch Antenna with Slots and Projections
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Solution Overview
Problem
Existing RFID antennas are too large for compact designs, particularly in UHF frequency ranges, and fractal antennas reduce bandwidth significantly while attempting to minimize size.
Innovation Solution
A compact patch antenna design with a planar resonator element is achieved by adding projections and removing material through slots, maintaining a simple polygon geometry and symmetry, which allows for increased bandwidth without the limitations of fractal antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the resonator is covered by a material having a higher dielectric constant to reduce antenna size, then the antenna size is reduced, but additional antenna losses occur and bandwidth is reduced
Solution Approach 1:
The patent changes the geometric parameters of the resonator by introducing slots and projections instead of using dielectric materials. The slots remove material from the resonator body while projections extend conductive regions, thereby reducing antenna size through dimensional modification rather than material substitution, avoiding the energy losses associated with high dielectric constant materials
Solution Approach 2:
The patent extends the resonator structure in two-dimensional space by adding projections that extend outward from the resonator body and slots that create indentations. This dimensional approach allows size reduction in the planar view while maintaining the necessary conductive path length and bandwidth characteristics without requiring volumetric dielectric materials
2Volume of moving object
If fractal structures are used to reduce antenna size, then the antenna becomes compact, but the bandwidth reduces very considerably
Solution Approach 1:
The patent segments the resonator structure by introducing multiple slots at different positions and orientations. These slots divide the continuous resonator body into distinct regions while maintaining overall connectivity through the conductive substrate. This segmentation approach reduces the planar footprint by creating a more compact layout while the strategic placement of slots preserves the resonant characteristics and bandwidth by maintaining adequate conductive path lengths
Solution Approach 2:
The patent employs asymmetric slot configurations where slots are positioned and oriented differently to optimize both size reduction and bandwidth maintenance. The slots are not uniformly distributed but strategically placed to create asymmetric patterns that reduce the overall antenna footprint while preserving the necessary electromagnetic resonance properties for adequate bandwidth operation
3Volume of moving object
If slots are added to the resonator edges to reduce size, then some size reduction is achieved, but the reduction is not sufficient for practical compact designs
Solution Approach 1:
The patent merges the slot features with projection features to create a combined structure. The slots remove material from the resonator body while projections extend conductive regions outward, creating a merged design that achieves maximum size reduction. This combination allows the antenna to achieve practical compactness by simultaneously utilizing both material removal and conductive extension strategies
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 design results in a very compact antenna with higher bandwidth, enabling efficient transmission and reception of circularly polarized electromagnetic signals, suitable for RFID systems, while maintaining symmetry and visibility for monitoring.
Implementation Method 1
a planar resonator element (22) which, viewed from above, has a simple polygonal basic shape whose outer contour is extended at the edges by slots (26) and projections (28)
Data Source
AI summary
An antenna (18), in particular a patch antenna, is provided having a planar resonator element (22) which has the geometry of a polygon with a plurality of edges, wherein the resonator element (22) has a plurality of slots (26) at the edges for their extension and additionally has a plurality of projections (28) at the edges.