Folded Multi-Strip Patch Antenna for Wide Bandwidth in Less Space
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Solution Overview
Problem
Conventional patch antennas face a trade-off between size reduction and bandwidth, with narrow bandwidth limiting their use in short to medium range wireless communication systems, such as wireless microphones and local wireless data networks.
Innovation Solution
A multi-layer multi-strip antenna configuration is employed, featuring a folded main patch with two radiating edges, parasitic patches coupled to the main patch, and tuning strips between the parasitic patches and the ground plane, allowing for significant size reduction and bandwidth broadening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the patch antenna size is reduced by shorting one edge or folding the patch, then the antenna size is reduced to one-fourth its original size, but the bandwidth is significantly reduced to 1.3% fractional bandwidth
Solution Approach 1:
The antenna is divided into multiple strips (first strip, second strip, third strip, fourth strip) arranged in a specific configuration. Each strip contributes to the overall radiation pattern and impedance characteristics, allowing the antenna to achieve broadband performance (40% fractional bandwidth) while maintaining a compact folded structure. The segmentation enables independent optimization of each strip's contribution to the total bandwidth.
Solution Approach 2:
The patent employs a folded patch configuration that utilizes three-dimensional spatial arrangement to reduce the antenna's footprint while maintaining electrical length. The strips are folded and arranged in multiple layers, transforming a planar structure into a compact 3D configuration that achieves size reduction without proportionally reducing bandwidth.
2Adaptability or versatility
If a conventional patch antenna is used, then the bandwidth is approximately 5%, but the size is relatively large (approximately one-half wavelength)
Solution Approach 1:
The conventional patch antenna is segmented into multiple narrow strips arranged in parallel. This segmentation increases the effective electrical length within a smaller physical footprint, enabling the antenna to achieve 40% fractional bandwidth while maintaining a compact size suitable for modern wireless communication devices.
Solution Approach 2:
The antenna structure combines multiple conductive strips with a ground plane and dielectric substrate to create a composite structure. This composite configuration allows the antenna to achieve enhanced bandwidth performance while maintaining a low profile and compact size, suitable for integration into wireless communication systems.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3~4B
AI summary
A system and method of providing a broadband patch antenna includes a main patch (101) having a first strip and a second strip positioned about a ground strip (102) extending from a ground plane (106), wherein at least a portion of the first strip of the main patch is disposed above the ground strip and forms a first radiating edge with the ground strip, and at least a portion of the second strip of the main patch is disposed below the ground strip and forms a second radiating edge with the ground plane. A parasitic patch (103, 104) is coupled to the main patch along at least a portion of a non-radiating edge of the main patch.