Mobile Device Antenna Structure with Notched Ground Element
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Solution Overview
Problem
Metal housing in mobile devices interferes with antenna radiation, limiting their ability to operate effectively across multiple frequency bands.
Innovation Solution
A substrate-based antenna structure is created using a ground element with a notch forming a slot region, where a radiating branch is disposed inside the slot and coupled to the ground branch, forming an antenna structure that can operate across multiple frequency bands by exciting both low and high frequency modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal housing is used for durability and aesthetics, then the mobile device structure is improved, but antenna radiation performance deteriorates
Solution Approach 1:
The antenna structure is segmented into a ground element and a radiating element that are spatially separated and electrically coupled. The radiating element is positioned within the slot region formed by the notch in the ground element, creating distinct functional zones that reduce mutual interference while maintaining structural integrity.
Solution Approach 2:
A substrate is introduced as an intermediary between the ground element and the radiating element. This substrate provides electrical coupling while electrically isolating the two elements, acting as a mediator that enables signal transmission while preventing direct interference between the ground and radiating structures.
2Ease of manufacture
If a fixed-size metal element is used as antenna main body, then manufacturing is simplified, but multi-frequency band operation capability is limited
Solution Approach 1:
The antenna structure incorporates adjustable elements including the radiating element length and the notch position/size in the ground element. These dynamic parameters can be adjusted to resonate at different frequencies, enabling the same basic structure to operate across multiple frequency bands by changing the electrical length and resonant characteristics.
Solution Approach 2:
The antenna operates across multiple frequency bands by changing key parameters: the length of the radiating element, the position and dimensions of the notch in the ground element, and the coupling strength between elements. These parameter variations allow the antenna to resonate at different frequencies while maintaining the same fundamental structure.
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 design allows the mobile device to efficiently operate across a wide range of frequency bands, including GSM900, Band 11, GPS, DCS1800, PCS1900, and UMTS, while minimizing interference from the conductive housing and saving internal space.
Implementation Method 1
a mobile device for operation in multiple frequency bands... an antenna structure... that can operate across multiple frequency bands by exciting both low and high frequency modes
Data Source
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AI summary
A mobile device (100) includes a substrate (110), a ground element (120), and a radiation branch (130). The ground element includes a ground branch (126), wherein an edge of the ground element has a notch extending into the interior of the ground element so as to form a slot region (124), and the ground branch partially surrounds the slot region. The radiation branch is substantially inside the slot region, and is coupled to the ground branch of the ground element. The ground branch and the radiation branch form an antenna structure.