Speaker Enclosure Antenna Integration Using Loop Resonators
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Solution Overview
Problem
The challenge in electronic devices is to effectively mount antennas without detuning or reducing the efficiency bandwidth at desired operating frequencies, due to factors like antenna position and size relative to device structures.
Innovation Solution
The use of a dielectric carrier structure, such as a hollow plastic speaker enclosure, to integrate antenna structures with loop antenna resonating elements formed from metal traces and housing, allowing sound emission while optimizing antenna performance through capacitance and inductance configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an antenna is mounted within an electronic device, then wireless communication functionality is provided, but the antenna may become detuned or exhibit undesirably small efficiency bandwidth at desired operating frequencies
Solution Approach 1:
The antenna is divided into multiple loop resonating elements formed from metal traces on the speaker enclosure. Each loop element can be independently configured to resonate at different frequencies, allowing the antenna system to maintain broad bandwidth efficiency while integrating into the device housing.
Solution Approach 2:
The speaker enclosure serves dual functions: it acts as both the acoustic housing for the speaker driver and as the carrier structure for the antenna resonating elements. The metal traces on the enclosure simultaneously form the antenna elements and can be configured to provide resonant circuits at multiple operating frequencies, eliminating the need for separate antenna structures.
2Adaptability or versatility
If loop antenna resonating elements are formed from metal traces on the speaker enclosure, then antenna structures are integrated into the device, but electrical coupling with the speaker driver may occur
Solution Approach 1:
A dielectric material is positioned between the metal traces forming the antenna resonating elements and the speaker driver. This dielectric intermediary electrically isolates the antenna elements from the speaker driver, preventing harmful electrical coupling while allowing the antenna to be integrated into the speaker enclosure structure.
Solution Approach 2:
The dielectric material is strategically placed only in the regions where electrical isolation is needed between the antenna traces and speaker driver, while maintaining antenna functionality in other areas. This localized application of dielectric material provides targeted electrical isolation without compromising overall antenna performance.
3Ease of operation
If openings in the speaker enclosure are used for sound emission, then acoustic functionality is provided, but the openings may interfere with antenna resonance
Solution Approach 1:
The loop antenna resonating elements are configured with asymmetric dimensions and shapes that allow them to maintain resonant properties despite the presence of openings in the speaker enclosure. The asymmetric geometry of the metal traces compensates for the discontinuities introduced by the acoustic openings, preserving antenna resonance.
Solution Approach 2:
The antenna resonating elements extend into the three-dimensional space around the speaker enclosure, utilizing vertical and lateral dimensions beyond the enclosure surface. This three-dimensional configuration allows the antenna to maintain resonance while the openings in the enclosure face do not interfere with the electromagnetic fields.
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 approach enhances antenna efficiency and bandwidth by utilizing the speaker enclosure volume for antenna functionality, minimizing electrical coupling with the speaker driver and ensuring effective sound emission.
Implementation Method 1
A gap in the metal strip may form a capacitance in the second loop antenna resonating element
Implementation Method 2
Segments of metal between the openings in the second loop antenna resonating element may collectively form the inductance for the second loop antenna resonating element
Data Source
AI summary
An electronic device may be provided with antenna structures. The antenna structures may be formed using a dielectric carrier structure such as a speaker enclosure, so that interior space within the electronic device that is occupied by a speaker can be used in forming an antenna. A speaker driver may be mounted in the speaker enclosure. Openings in the speaker enclosure may allow sound from the speaker driver to be emitted from the speaker enclosure. The antenna structures may have first and second loop antenna resonating elements. The first loop antenna resonating element may indirectly feed the second loop antenna resonating element. The second loop antenna resonating element may be a distributed loop element formed from a strip of metal with a width that loops around the speaker enclosure. Openings in the second loop antenna resonating element may be aligned with the speaker enclosure openings.