Loop Antenna With L-Shaped Resonators for Wideband Compactness
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Solution Overview
Problem
Existing antenna devices struggle to support a wide frequency band while maintaining a compact size, with fractional bandwidths being limited to about 10% for general dipole antennas and 0.5% for microstrip line antennas, and methods to extend bandwidth result in narrow supported bands.
Innovation Solution
The antenna device incorporates a feed antenna, a loop antenna surrounding it, and two L-shaped resonators on both sides, supporting both a 5 GHz and a 7 GHz band with reduced size by optimizing element lengths and configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If general dipole antenna is used, then the structure is simple, but the fractional bandwidth is limited to about 10%
Solution Approach 1:
The patent places two resonators inside the loop antenna structure, creating a nested configuration where smaller resonant elements are contained within the larger loop. This nesting allows multiple resonance frequencies to coexist in a compact space, achieving ultra-wideband operation (5.00-7.00 GHz) without significantly increasing overall device complexity
Solution Approach 2:
The patent combines multiple antenna elements (feed antenna, loop antenna, and two resonators) into a single integrated structure. The feed antenna is positioned at the center of the loop, with resonators attached to both sides, creating a unified antenna system that operates across a wide frequency range through coupled resonance modes
2Volume of moving object
If microstrip line antenna is used, then the antenna size is compact, but the fractional bandwidth is only about 0.5%
Solution Approach 1:
The resonators are positioned inside the loop antenna structure, utilizing the internal space of the loop to accommodate additional resonant elements. This nested arrangement achieves ultra-wideband performance without significantly increasing the overall antenna volume, maintaining compactness while expanding operational bandwidth to 5.00-7.00 GHz
Solution Approach 2:
The patent transitions from planar microstrip line geometry to a three-dimensional loop structure with resonators extending in multiple directions. This dimensional change allows the antenna to support multiple resonance modes simultaneously, achieving wide bandwidth while maintaining compact volume through spatial efficiency
3Adaptability or versatility
If bandwidth extension methods are applied, then the frequency range increases, but the supported band becomes narrow
Solution Approach 1:
The resonators are positioned at specific locations on both sides of the feed antenna within the loop structure. This strategic placement creates localized resonance zones that collectively contribute to wideband operation, ensuring stable VSWR characteristics across the entire 5.00-7.00 GHz range through optimized local electromagnetic field distribution
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 device achieves stable VSWR of 3 or less across 5.00 GHz to 7.00 GHz, enabling efficient wireless communication in a wide band with reduced size and adjustable directivity.
Implementation Method 1
two resonators provided inside the loop antenna and on both sides of the feed antenna in a short of direction the feed antenna. Each of the two resonators is connected to the loop antenna and has an L shape
Data Source
AI summary
There are provided an antenna device and a communication device including: a feed antenna connected to a feed point; a loop antenna connected to ground and arranged to surround the feed antenna; and two resonators provided inside the loop antenna and on both sides of the feed antenna in a short direction of the feed antenna. Each of the two resonators is connected to the loop antenna and has an L shape.