Broadband Antenna With Planar Ground And Resonating Elements
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Solution Overview
Problem
Conventional handheld electronic devices face challenges in designing antennas that cover a wide range of communications bands while maintaining superior radio-frequency performance, often resulting in large, awkwardly shaped, or inefficient antennas.
Innovation Solution
A broadband antenna design featuring a ground element and a resonating element separated by a gap, both lying in a common plane, with the same shape and size, mounted on a planar surface within the device's housing, avoiding overlap with electronic components to minimize interference and optimize radio-frequency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are used to cover multiple communications bands, then the coverage range is improved, but the device complexity and size increase
Solution Approach 1:
The patent implements a single broadband antenna that can operate across multiple communications bands (GSM 850/900/1800/1900, GPS L1/L2, WCDMA, CDMA2000, LTE, Wi-Fi, Bluetooth) by using a resonating element with variable electrical length. This allows one antenna structure to perform multiple functions that would traditionally require separate antennas, thereby reducing device complexity while maintaining wide coverage capability
Solution Approach 2:
The patent employs a resonating element with adjustable electrical length to achieve broadband operation. By changing the electrical length parameter of the resonating element (through switching networks or variable capacitors), the antenna can be tuned to resonate at different frequencies, enabling single-antenna multi-band coverage without increasing physical size or complexity
2Reliability
If antenna size is increased to improve performance, then the radio-frequency performance is improved, but the antenna becomes undesirably large for handheld devices
Solution Approach 1:
The patent utilizes the third dimension (vertical height) by positioning the resonating element above the ground element with a specific spacing, creating a three-dimensional antenna structure. This allows the antenna to achieve resonant frequencies and impedance matching that would require much larger planar dimensions, thereby achieving good radio-frequency performance within the compact footprint constraints of handheld devices
Solution Approach 2:
The patent embeds the resonating element and ground element in a nested configuration where the resonating element is positioned above the ground element within the device housing. This nested arrangement allows the antenna structure to be compact while maintaining the electrical length and spacing required for resonant operation, achieving good performance without excessive size
3Adaptability or versatility
If conventional antenna designs are used to cover wide frequency ranges, then the bandwidth is improved, but the antenna shape becomes awkward
Solution Approach 1:
The patent employs an asymmetric resonating element design where the element has different dimensions in different directions (e.g., longer in one direction than the other). This asymmetric geometry allows the antenna to achieve broadband resonance characteristics and match impedance across multiple frequency bands while maintaining a regular, manufacturable shape that is easier to integrate into device housings compared to conventional broadband antenna shapes
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 design enables efficient coverage of multiple communications bands, such as cellular, GPS, and Wi-Fi frequencies, with a compact and efficient antenna structure that reduces device complexity and cost, while maintaining optimal radio-frequency performance.
Implementation Method 1
A broadband antenna may have a ground element and a resonating element that are separated by a gap
Implementation Method 2
a resonating element that are separated by a gap
Data Source
AI summary
Broadband antennas and handheld electronic devices with broadband antennas are provided. A handheld electronic device has integrated circuits, a display, and a battery mounted within a housing. The housing has a planar inner surface. A broadband antenna for the handheld electronic device has a ground element and a resonating element. The ground element and resonating element may have the same shape and may have the same size. The ground element and resonating element may lie in a common plane and be separated by a gap that lies in the common plane. The plane in which the ground element and resonating element lie may be parallel to the planar inner surface of the housing. Electronic components such as the integrated circuits, display, and battery can be mounted in the handheld device so that they do not overlap the gap between the ground element and the resonating element.