Nested Wideband Antenna for Compact Handheld Devices
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Solution Overview
Problem
The challenge in designing antennas for handheld electronic devices is to accommodate multiple frequency bands within a small form factor, particularly with the addition of 4G LTE frequencies, while maintaining efficient wireless communication capabilities.
Innovation Solution
A wideband antenna design featuring a feed element and a ground element with specific geometrical configurations, where the ground element is internally coupled and partially surrounds the feed element, allowing for magnetic coupling and achieving a low-Q multi-band resonating structure that covers frequencies from 704-960 MHz and 1500-2200 MHz, including GPS frequencies, with an extremely low profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna size is reduced to meet small form factor requirements, then the device size is reduced, but the bandwidth coverage and multi-frequency band performance deteriorate
Solution Approach 1:
The ground element is positioned inside the feed element structure, with the first ground element end located proximate and inside the first feed element end, and the second ground element end located proximate and outside the second feed element end. This nested configuration allows the antenna to achieve wide bandwidth coverage across multiple frequency bands (704-960 MHz and 1500-2200 MHz) while maintaining an extremely low profile and small volume suitable for handheld devices.
2Volume of moving object
If multiple frequency bands are accommodated in a small antenna, then the device remains compact, but the manufacturing complexity increases
Solution Approach 1:
The antenna is divided into distinct functional segments: a feed element with first and second ends, and a ground element with first and second ends. The ground element is segmented into portions located inside and outside the feed element, allowing for simplified manufacturing while achieving multi-band performance. This segmentation enables straightforward assembly and integration into handheld devices without complex manufacturing processes.
3Adaptability or versatility
If the ground element is internally coupled and partially surrounds the feed element, then wide bandwidth coverage is achieved, but the structural complexity increases
Solution Approach 1:
The ground element is positioned inside the feed element structure, with the first ground element end located proximate and inside the first feed element end, and the second ground element end located proximate and outside the second feed element end. This nested configuration allows the antenna to achieve wide bandwidth coverage across multiple frequency bands (704-960 MHz and 1500-2200 MHz) while maintaining an extremely low profile and small volume suitable for handheld devices.
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 coverage for both low and high bands, ensuring compatibility with various wireless standards and meeting the volume constraints of smaller devices, while maintaining low return loss values and efficient communication.
Implementation Method 1
A wideband antenna design featuring a feed element and a ground element with specific geometrical configurations, where the ground element is internally coupled and partially surrounds the feed element, allowing for magnetic coupling
Implementation Method 2
achieving a low-Q multi-band resonating structure that covers frequencies from 704-960 MHz and 1500-2200 MHz, including GPS frequencies
Data Source
AI summary
Provided is an antenna. The antenna, in one embodiment, includes a feed element having a first feed element end and a second feed element end, the first feed element end configured to electrically connect to a positive terminal of a transmission line. The antenna, in this embodiment, further includes a ground element having a first ground element end and a second ground element end, the first ground element end configured to electrically connect to a negative terminal of the transmission line. In this particular embodiment, the first ground element end is located proximate and inside the first feed element end, and the second ground element end is located proximate and outside the second feed element end.