Flared Fed Inverted F Antenna Impedance Matching
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Solution Overview
Problem
Existing antenna designs for wireless communication devices face challenges in occupying minimal footprint on PCBs, reducing interference from nearby on-board metal components, and maintaining effective signal transmission across multiple frequency bands, particularly for LTE, 2G, and 3G devices.
Innovation Solution
The design incorporates a Flared Fed Inverted F Antenna (FFIFA) with a taper-shaped flare and a shorting stub for impedance matching, allowing the antenna to occupy a small footprint on the PCB while maintaining omni-directional radiation patterns despite nearby metal objects, using a radiator, limb, flare, feed point, and shorting stub configured to operate across variable frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If existing antenna designs are used, then signal transmission is achieved, but the antenna occupies large footprint on PCB
Solution Approach 1:
The patent transitions from planar 2D antenna designs to a 3D folded inverted-F structure. The radiator is folded along multiple axes to create a three-dimensional configuration that achieves the required electrical length for resonance while occupying minimal PCB footprint. This dimensional transformation allows the antenna to maintain effective signal transmission across multiple frequency bands without requiring large planar area.
Solution Approach 2:
The antenna structure employs nested folding where the radiator is folded back on itself multiple times, creating a compact nested configuration. Each fold nests part of the radiator structure within the space occupied by previous folds, achieving maximum space utilization and minimal footprint while maintaining the necessary electrical characteristics for multi-band operation.
2Device complexity
If antenna is placed near on-board metal components, then device integration is improved, but interference from metal components affects performance
Solution Approach 1:
The patent strategically positions the folded antenna structure to utilize nearby metal components and housing structures as ground references and shielding elements. The complex 3D folded geometry is designed to work in conjunction with surrounding metal structures, converting potential interference sources into beneficial reference planes that improve antenna performance and stability in compact device configurations.
Solution Approach 2:
Different portions of the folded radiator are positioned at specific locations and orientations to optimize local electromagnetic characteristics. Each fold and segment is strategically placed to minimize coupling with specific metal components while maximizing desired radiation patterns, allowing the antenna to maintain performance despite proximity to various on-board metal structures.
3Adaptability or versatility
If single frequency band antenna is used, then design is simple, but multi-band operation is not achieved
Solution Approach 1:
The folded inverted-F antenna structure is designed to operate across multiple frequency bands (2G, 3G, and LTE bands) using a single unified geometry. By carefully controlling the dimensions and fold configurations of the radiator, the antenna achieves resonant frequencies at multiple bands simultaneously, eliminating the need for separate antennas for different frequency bands and simplifying the overall device architecture.
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
The antenna achieves optimal impedance matching and omni-directional radiation patterns, minimizing footprint and interference, and maintains performance across multiple frequency bands, including LTE, 2G, and 3G, with improved stability against on-board metal components and housing materials.
Implementation Method 1
a flare placed at one of the first end and the second end of the radiator for matching impedance
Implementation Method 2
a shorting stub placed between the flare and the printed circuit board for grounding a capacitance induced by the antenna
Implementation Method 3
the antenna radiates the energy from the current as electromagnetic waves (i.e. radio waves). In a radio reception system, the antenna intercepts some of the power of the electromagnetic wave
Data Source
AI summary
Embodiments of the present invention relate to an antenna [100] for matching an impedance between a feed point [140] and a radiator [110], comprising: the radiator [110] mounted, over a printed circuit board, has a first end and a second end; a flare [130] for matching the impedance, wherein the flare [130] has a first end and a second end, and the flare [130] is taper-shaped from the first end to the second end of the flare [130]; the feed point [140] comprises a first end and a second end, wherein the first end of the feed point [140] is connected to the second end of the flare [130], and the second end of the feed point [140] is connected to the printed circuit board; and a shorting stub [150] placed between the flare [130] and the printed circuit board for grounding a capacitance induced by the antenna [100].