Planar Inverted-F Antenna Extended Grounding Plane Impedance
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Solution Overview
Problem
Conventional planar inverted-F antennas (PIFAs) face limitations in impedance matching and impedance bandwidth, which hinders their performance and market competitiveness, especially in compact portable electronic devices.
Innovation Solution
An integrally-formed, three-dimensional, dual-band planar inverted-F antenna with an extended grounding plane, featuring a grounding metal plate, an extended grounding plane, a short-circuit piece, and independent antenna signal radiating plates for high and low frequencies, allowing for adjustable impedance matching and increased impedance bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the conventional PIFA construction is used, then the antenna structure remains simple and compact, but the impedance matching and impedance bandwidth are insufficient
Solution Approach 1:
The patent extends the grounding plane from a two-dimensional planar structure to a three-dimensional structure by adding vertical extension portions that rise from the base grounding plane. This dimensional transformation increases the effective grounding area and improves impedance matching characteristics without significantly increasing the overall footprint of the antenna, thus maintaining compactness while enhancing performance.
Solution Approach 2:
The patent introduces localized extensions to specific portions of the grounding plane rather than uniformly expanding the entire grounding structure. The vertical extension portions are strategically positioned at specific locations to optimize impedance matching at particular frequency bands, allowing targeted improvement of antenna performance while maintaining overall structural simplicity.
2Device complexity
If the conventional PIFA construction is used, then the antenna structure remains simple, but the impedance bandwidth is limited
Solution Approach 1:
By transforming the grounding plane from a flat two-dimensional structure to a three-dimensional structure with vertical extensions, the patent increases the effective electrical length and surface area of the grounding system. This dimensional change enables the antenna to support a broader range of frequencies and improve impedance bandwidth while adding minimal structural complexity.
Solution Approach 2:
The grounding plane is divided into distinct segments including the base grounding plane and multiple vertical extension portions. Each segment can be independently optimized for different frequency ranges, allowing the antenna to achieve dual-band or multi-band operation. This segmentation strategy expands impedance bandwidth while maintaining relatively simple construction through modular design.
Data Source
AI summary
Disclosed is a planar inverted-F antenna with an extended grounding plane. The planar inverted-F antenna has a grounding metal plate having a selected side edge on which the extended grounding plane is formed and has a predetermined height. At least one antenna signal radiating plate is connected to the grounding metal plate by a short-circuit piece and is substantially parallel to and spaced from the grounding metal plate by a distance. A feeding point extends from the antenna signal radiating plate in a direction toward the grounding metal plate and corresponds to the extended grounding plane with a predetermined gap therebetween. With the arrangement of the extended grounding plane, the impedance matching of the antenna is improved and the impedance bandwidth of the antenna is increased.