Planar Antenna With Angled Elements For Multiband Resonance
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Solution Overview
Problem
Conventional multiband inversed F-shaped antennas have a narrow band width for resonance frequency bands and require a large storage space due to their cubic resonance structure.
Innovation Solution
A planar antenna design featuring a film of insulating material with a planar conductor antenna portion and a grounded conductor portion, including short stubs and antenna elements that increase in distance from the feeding point, allowing for multiple resonance frequencies and reduced storage space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional multiband inversed F-shaped antenna with rectangular antenna elements is used, then multiple resonance frequency bands can be achieved, but the band width of each resonance frequency is narrow and the storage space required is large
Solution Approach 1:
The patent transitions from a three-dimensional cubic resonance structure to a two-dimensional planar configuration. The antenna elements are arranged flatly on a substrate, eliminating the need for vertical stacking or cubic volume, thereby significantly reducing storage space while maintaining multiband functionality through careful planar geometry design
Solution Approach 2:
The patent modifies the geometric parameters of the antenna elements, specifically using non-rectangular shapes with angles where the distance from the ground portion increases. This parameter change enables broader bandwidth by creating multiple current paths and resonance modes within the same physical footprint, allowing wideband operation across multiple frequency bands
2Adaptability or versatility
If a conventional multiband inversed F-shaped antenna with rectangular antenna elements is used, then multiple resonance frequency bands can be achieved, but the band width of each resonance frequency is narrow
Solution Approach 1:
The antenna is divided into multiple discrete elements with different geometries, each contributing to specific resonance frequencies. The segmented structure includes antenna elements of varying lengths and configurations, allowing independent optimization of each segment's resonant characteristics while collectively achieving broad multiband coverage
Solution Approach 2:
The patent employs asymmetric antenna element designs where the distance from the ground portion varies along the element length. This asymmetry creates unequal current distribution patterns that generate multiple resonance modes, thereby extending the operational bandwidth of each frequency band compared to symmetric rectangular designs
3Reliability
If a cubic resonance structure is used, then resonance can be achieved, but the storage space for the antenna has to be large
Solution Approach 1:
The patent replaces the three-dimensional cubic resonance structure with a two-dimensional planar configuration. The resonant elements are arranged flatly on a substrate plane, eliminating the need for vertical depth and cubic volume, thereby reducing storage space requirements while maintaining reliable resonance through optimized planar geometry and current path design
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 design extends the band width of resonance frequency bands and reduces storage space, enabling efficient wireless communication in portable devices while maintaining compactness.
Implementation Method 1
the band width of each of the plurality of resonance frequency bands can be extended in the multiband antenna
Data Source
AI summary
Disclosed is a planar antenna, including: a film formed of a planar insulating material; an antenna portion which is a planar conductor on the film; and a ground portion which is a conductor to be grounded, wherein the antenna portion comprises: at least one first short stub; a first antenna element which is connected to the ground portion through the at least one first short stub and whose shape has such an angle that a distance between the first antenna element and the ground portion increases with increasing distance from a feeding point along the ground portion, the feeding point being provided between the first antenna element and the ground portion; a second short stub; and a second antenna element which is connected to the first antenna element through the second short stub.