Double-Slot Antenna Structure for Multi-Band Mobile Devices
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Solution Overview
Problem
Designing antennas for mobile computing devices that operate over multiple frequency bands while being enclosed within the device's physical dimensions is challenging, particularly for wireless wide area network (WWAN) antennas.
Innovation Solution
A double slot antenna configuration with an inner and outer slot defined within and between an antenna element and a metal frame, along with a notch in the metal frame, allowing for operation over multiple frequency bands, and an impedance matching component for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single slot antenna is used, then the antenna structure is simple, but it cannot operate over multiple frequency bands
Solution Approach 1:
The antenna element is divided into two distinct slots (inner slot and outer slot) that can be independently tuned to different frequency bands. Each slot acts as a separate resonant element, allowing the antenna to operate on multiple frequency bands simultaneously while maintaining a relatively simple overall structure.
Solution Approach 2:
The antenna design enables a single antenna structure to perform multiple functions by supporting operation across multiple frequency bands including GPS, Wi-Fi, Bluetooth, UWB, and cellular bands (2G, 3G, 4G, LTE, 5G). The inner and outer slots can be configured to handle different frequency ranges, making the antenna universally applicable for various wireless communication standards.
2Adaptability or versatility
If the antenna element is fully enclosed by the metal frame, then the structural support is strong, but the antenna cannot operate over multiple frequency bands
Solution Approach 1:
The metal frame is segmented by introducing notches that create discontinuities in the otherwise continuous frame structure. These notches allow the formation of outer slots between the antenna element and the frame, enabling multi-frequency operation while the frame still provides structural support through its partially enclosed configuration.
Solution Approach 2:
portions of the metal frame are removed or interrupted by notches to create the outer slot regions. This extraction of frame material enables the antenna to support multiple frequency bands while the remaining frame structure continues to provide necessary mechanical support and positioning.
3Adaptability or versatility
If the antenna operates over multiple frequency bands, then the adaptability is improved, but the return loss increases
Solution Approach 1:
The inner and outer slots are designed with specific local dimensions and geometries optimized for their respective frequency band assignments. This local optimization allows each slot to maintain low return loss at its target frequencies while the overall antenna structure supports multiple frequency bands. The impedance matching component further refines the local electrical characteristics to minimize reflections.
Solution Approach 2:
The antenna design utilizes adjustable parameters including slot dimensions, frame notch positions and sizes, and impedance matching component values to optimize performance across multiple frequency bands. By carefully controlling these parameters, the antenna achieves consistent operation with minimal return loss across the broad frequency range covering GPS, Wi-Fi, Bluetooth, UWB, and cellular bands.
Data Source
AI summary
A double slot antenna is provided. The double slot antenna includes an antenna element defining a reference plane, the antenna element being partially enclosed by a metal frame along the reference plane. The double slot antenna further includes an inner slot defined within the antenna element along the reference plane. The double slot antenna further includes an outer slot defined between the antenna element and a metal frame along the reference plane. The metal frame comprises a notch.