Sharkfin Antenna with Shaped Ground Plane for Multiband Miniaturization
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Solution Overview
Problem
Current Sharkfin wireless devices are large and struggle to efficiently operate across multiple frequency bands, including low-frequency bands like LTE700, while maintaining performance at high-frequency bands, necessitating a reduction in size and improvement in gain and efficiency.
Innovation Solution
A Sharkfin wireless device with a radiating system comprising a radiation booster, ground plane layer, and conductive element, featuring a multiband matching network and a slotted or concave ground plane layer to enhance input matching and bandwidth, allowing operation at reduced dimensions with improved performance across LTE700 and other bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the device dimensions are reduced, then the device becomes more compact and suitable for miniaturization demands, but the bandwidth at low frequencies deteriorates and performance at high frequency bands is compromised
Solution Approach 1:
The ground plane is segmented into multiple regions with different geometries (rectangular ground plane with specific dimensions) to support different frequency bands. The radiating structure is divided into multiple elements including dipole antennas and rectangular resonators, each contributing to different frequency ranges, enabling multiband operation in a compact form factor.
Solution Approach 2:
The patent utilizes three-dimensional space by mounting the radiating structure vertically on the ground plane and employing rectangular resonators with specific height dimensions. This vertical dimensionality allows the compact device to achieve low-frequency operation without increasing horizontal footprint, resolving the contradiction between size reduction and bandwidth maintenance.
2Volume of moving object
If the device dimensions are reduced, then the device becomes more compact, but the gain and efficiency performances deteriorate
Solution Approach 1:
Different portions of the radiating structure are designed with specific local characteristics: dipole antennas for certain bands, rectangular resonators for other bands, each optimized for its designated frequency range. The ground plane is also locally optimized with specific dimensions and positioning to enhance overall system performance while maintaining compact size.
Solution Approach 2:
The radiating structure combines multiple antenna types (dipole antennas and rectangular resonators) and materials with different electromagnetic properties to achieve broad bandwidth operation and high efficiency in a compact device. This composite approach allows the small device to maintain excellent gain and efficiency across multiple frequency bands.
3Adaptability or versatility
If the device is designed for multiband operation including low-frequency bands, then the bandwidth is enlarged, but the device size increases
Solution Approach 1:
Multiple antenna functions are merged into a single integrated radiating structure mounted on one ground plane. The dipole antennas and rectangular resonators work together in a unified configuration, enabling multiband operation without requiring separate antenna systems for each frequency band, thus avoiding size increase.
Solution Approach 2:
The radiating structure is designed as a universal system that simultaneously supports multiple frequency bands (LTE700, LTE1500, LTE2600, GPS, WiFi) through its integrated components. This multi-functional design allows a single compact device to replace what would traditionally require multiple separate antennas, achieving bandwidth enlargement without proportional size increase.
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 solution enables a compact wireless device with enhanced gain and efficiency, achieving better performance at low-frequency bands like LTE700 and high-frequency bands, with reduced dimensions and improved radiation and antenna efficiencies.
Implementation Method 1
a radiating system configured to operate in multiple bands... operation at LTE bands, GPS, Wifi and/or Wimax bands
Implementation Method 2
a ground plane layer... connected to an additional ground plane by a conductive element
Data Source
AI summary
The described system refers to a Sharkfin wireless device comprising a radiating structure, a feeding system and an external port, the radiating structure comprising at least a radiation booster, a ground plane layer and a conductive element that connects at least one the radiation booster to the ground plane layer. The radiating system arrangement features reduced dimensions and multiband operation including low-frequency bands like LTE700.