Loop Antenna Parasitic Element Nesting for Compact Multi-Band Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Portable electronic devices face challenges in designing antennas that can support wide and multiple frequency bands, such as pentaband and GPS, while maintaining a small size due to limitations in electrical size and bandwidth.
Innovation Solution
A loop antenna design incorporating a feeding arm with a conductive loop antenna and an elongated excitation arm, along with a parasitic element that wraps around the excitation arm, coupled to a ground plane, allowing for efficient radiation across various frequency bands without increasing the antenna's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the antenna size is increased to achieve wide bandwidth and multiple frequency bands, then the bandwidth and frequency band coverage are improved, but the device size increases which is not acceptable for portable electronic devices
Solution Approach 1:
The parasitic element is wrapped around the excitation arm, creating a nested configuration where one antenna component is positioned within the spatial envelope of another. This nesting allows the antenna to achieve enhanced electrical size and bandwidth without increasing the external dimensions of the antenna structure, resolving the contradiction between bandwidth coverage and physical size.
Solution Approach 2:
The parasitic element is positioned in three-dimensional space wrapped around the excitation arm, utilizing the third dimension (height/thickness) rather than only the planar dimensions. This dimensional transition allows the antenna to achieve wider bandwidth and multiple frequency band support without increasing the antenna's footprint area, thereby maintaining compact size while improving adaptability.
2Volume of moving object
If a compact antenna design is used to maintain small device size, then the device dimensions are reduced, but the bandwidth and frequency band response are limited
Solution Approach 1:
By nesting the parasitic element around the excitation arm, the design achieves enhanced electrical characteristics within a compact physical envelope. The nested configuration allows the antenna to support multiple frequency bands and wide bandwidth while maintaining small external dimensions suitable for portable devices.
Solution Approach 2:
The invention changes the electrical parameters of the antenna system by introducing a parasitic element with specific impedance characteristics. This parasitic element, when wrapped around the excitation arm, modifies the overall impedance matching and resonance characteristics, enabling wide bandwidth and multiple frequency band response from a compact structure.
3Device complexity
If traditional loop antenna designs are used, then the structure is simple, but the bandwidth is limited and cannot support multiple frequency bands effectively
Solution Approach 1:
The parasitic element is wrapped around the excitation arm in a nested configuration, adding functional complexity without significantly increasing structural complexity. This nested arrangement enables the antenna to support multiple frequency bands and achieve wide bandwidth while maintaining a relatively simple overall structure that can be manufactured using standard PCB techniques.
Solution Approach 2:
The parasitic element acts as an intermediary component that couples electromagnetically with the excitation arm. This intermediary element modifies the radiation characteristics and impedance matching of the antenna, enabling wide bandwidth and multiple frequency band support while keeping the basic loop antenna structure relatively simple.
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 wide bandwidth and multiple frequency band response, including pentaband and GPS frequencies, with efficient radiation and impedance matching, maintaining a compact size suitable for portable devices.
Implementation Method 1
an antenna may be designed in accordance with one embodiment of the present invention so as to enable both wide and multiple frequency band response
Data Source
AI summary
An antenna, a portable electronic device incorporating an antenna and a method of operation are provided to enable both wide and multiple frequency band response. The antenna may include a feeding arm and a parasitic element. The feeding arm may include a conductive loop antenna and a conductive excitation arm portion. The loop antenna portion may extend from a first end that is configured to be grounded to a second end that is configured to be driven by radio frequency circuitry. The excitation arm may be coupled at a first end to the loop antenna portion and extend outwardly therefrom to an open end. The parasitic element may extend from a first end is configured to be grounded to a second end that is open. The parasitic element may extend along opposite sides of the excitation arm portion so as to be coupled thereto.