Loop Antenna Layout With L-Shaped Resonators for Low VSWR

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Solution Overview

Problem

Existing antenna devices face challenges in supporting wider frequency bands while maintaining a compact size, as the number of elements increases with frequency extension, leading to narrow fractional bandwidths and inefficient resonance.

Innovation Solution

The antenna device incorporates a feed antenna connected to a feed point, a loop antenna surrounding the feed antenna, and two L-shaped resonators inside the loop antenna on both sides of the feed antenna, allowing for efficient resonance across ultra-wideband frequencies, including 5 GHz and 7 GHz bands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the number of antenna elements is increased to support wider frequency bands, then the frequency coverage is improved, but the antenna size and structural complexity increase

Engineering Contradiction:

Improvefrequency band coverageVSAvoidantenna structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines multiple antenna elements (feed antenna, loop antenna, and resonators) into a single integrated structure that supports multiple frequency bands. The resonators are positioned inside the loop antenna structure, merging multiple functional elements into a compact unified design that achieves wideband operation without proportionally increasing overall complexity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The resonators are nested inside the loop antenna structure, with the resonators positioned within the boundaries of the loop antenna. This nested arrangement allows multiple antenna elements to occupy overlapping or adjacent spatial regions, achieving compact integration and supporting multiple frequency bands within a reduced form factor

Inventive Principle:

Principle #7Nested doll (Nesting)

2Adaptability or versatility

If the number of antenna elements is increased to support wider frequency bands, then the frequency coverage is improved, but the antenna size increases

Engineering Contradiction:

Improvefrequency band coverageVSAvoidantenna size

Core Design Contradiction:

Adaptability or versatilityVSVolume of moving object

Solution Approach 1:

The resonators are nested inside the loop antenna structure, allowing multiple antenna elements to share the same spatial envelope. This nested configuration enables the antenna to support wide frequency bands (including 5 GHz and 7 GHz bands) while maintaining a compact overall size, as the resonators utilize the internal space of the loop antenna rather than requiring additional external volume

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The antenna elements are arranged in a three-dimensional configuration where resonators are positioned at specific locations inside the loop antenna structure. This spatial arrangement in multiple dimensions allows efficient use of available space, achieving wideband operation without proportional increases in overall antenna volume

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Device complexity

If conventional antenna configurations are used, then the structure is simple, but the fractional bandwidth becomes narrow and resonance efficiency decreases

Engineering Contradiction:

Improveantenna structure simplicityVSAvoidfractional bandwidth

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent merges multiple antenna elements (feed antenna connected to feed point, loop antenna connected to ground, and resonators) into a single operational system. This combination creates multiple resonance paths and mechanisms that work together to achieve wide fractional bandwidth while maintaining a relatively simple integrated structure, overcoming the limitations of conventional single-element antennas

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The loop antenna structure serves multiple functions simultaneously: it acts as the main radiating element, provides a framework for housing resonators, and contributes to ground reference. This multi-functional design enables the antenna to support wide frequency bands including 5 GHz and 7 GHz bands without requiring separate dedicated structures for each function

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

This configuration enables the antenna device to support a wide frequency band, reduce size, and maintain low VSWR values, ensuring stable communication across the specified bands with improved directivity and signal irradiation characteristics.

Implementation Method 1

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

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentEP4290697A1Antenna device and communication device

Publication Date: 2023.12.13 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

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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.