3D Antenna Structure With Capacitive Extensions for Smaller Footprint
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Solution Overview
Problem
Conventional antenna structures occupy a significant area when deployed on devices, limiting the ability to reduce the volume of final products due to their planar design, especially in ultra-high frequency applications where larger dimensions are required.
Innovation Solution
The antenna structure incorporates a three-dimensional design with an insulating seat, first and second antennas, and feeding points, featuring non-parallel extending portions that generate a capacitance effect, allowing for a more compact footprint while maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional planar antenna structures are used, then the antenna can be manufactured with simple processes, but the antenna occupies a large area on the device
Solution Approach 1:
The patent transitions from a conventional two-dimensional planar antenna structure to a three-dimensional configuration by adding vertical extending portions that protrude from the substrate surface. This dimensional change allows the antenna to achieve the required electrical length for UHF RFID operations while occupying significantly less horizontal area on the device surface.
Solution Approach 2:
The antenna is divided into multiple functional segments: a planar body portion lying on the substrate, and multiple extending portions protruding vertically from different sides of the body. This segmentation allows each portion to contribute differently to the overall antenna performance while collectively achieving compact footprint.
2Reliability
If the antenna side length is designed to be 1/2λ for UHF RFID, then the antenna operates at the required frequency band, but the antenna occupies an area greater than 16 cm
Solution Approach 1:
By extending portions of the antenna vertically from the substrate surface, the patent creates a three-dimensional structure where the total electrical length reaches 1/2λ for UHF RFID operation. The vertical extension contributes to the effective electrical length without increasing the horizontal footprint, thus maintaining frequency band operation while reducing area below 16 cm².
Solution Approach 2:
The patent changes the geometric parameters of the antenna by introducing varying lengths and orientations of extending portions relative to the planar body. This parameter variation optimizes the electrical length-to-area ratio, ensuring the antenna meets the 1/2λ requirement for 902-928 MHz operation while minimizing the occupied area.
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 achieves a smaller area occupation compared to traditional planar structures while maintaining the same gain, enabling more efficient use of space in devices.
Implementation Method 1
the second extending portions and the first extending portions are spaced apart from each other by a predetermined distance, so that the second extending portions and the first extending portions are configured to jointly generate a capacitance effect
Data Source
AI summary
An antenna structure is provided. The antenna structure includes an insulating seat, a first antenna and a second antenna disposed on the insulating seat, and two feeding points electrically coupled to the first antenna and the second antenna. The first antenna includes a first body portion and a plurality of first extending portions non-parallel to the first body portion. The second antenna includes a second body portion and a plurality of second extending portions. The second body portion is spaced apart from the first body portion and non-parallel to each of the second extending portions. A length of one of the second extending portion adjacent to a diagonal line of the second body portion is less than a length of another one of the second extending portions. The second extending portions and the first extending portions are spaced apart from each other and jointly generate a capacitance effect.