Multi-band Antenna Structure with Switch Circuit for Compact Wireless Devices
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Solution Overview
Problem
The complexity and large size of existing antenna structures in wireless communication devices hinder miniaturization efforts, as they are designed to handle various frequency bands efficiently while occupying significant space.
Innovation Solution
A compact antenna structure with a housing comprising a system ground plane, side frame, middle frame, and back board, along with a switch circuit that adjusts electrical connections to enable multi-frequency operations, allowing for efficient radiation across different frequency bands including GPS, WIFI, and LTE-A modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional antenna structures are used to cover multiple frequency bands, then frequency coverage is improved, but device size and structural complexity increase
Solution Approach 1:
The patent implements a single antenna structure that can operate across multiple frequency bands (GPS, WIFI 2.4GHz, WIFI 5GHz, LTE-A) by using a switch circuit to reconfigure the antenna's electrical connections. The antenna serves multiple functions simultaneously, eliminating the need for separate antennas for each frequency band, thus reducing device size while maintaining broad frequency coverage
Solution Approach 2:
The patent employs a switch circuit that dynamically reconfigures the antenna structure's electrical connections based on the required frequency band. By changing the switching state, the antenna's effective electrical length and impedance are adjusted to match different frequency requirements, enabling a single physical structure to adapt to multiple operating conditions without increasing device volume
2Adaptability or versatility
If traditional antenna structures are used to cover multiple frequency bands, then frequency coverage is improved, but structural complexity increases
Solution Approach 1:
The patent uses a single unified antenna structure with integrated ground planes and feed networks that can serve multiple frequency bands. The switch circuit provides the necessary reconfiguration capability, but the overall structure remains simpler than having separate antennas for each band, as it shares common elements like the radiating element and ground plane across all frequency operations
Solution Approach 2:
The patent combines multiple antenna functions into a single integrated structure. The first and second ground planes, along with the switch circuit and feed networks, are merged into one cohesive antenna system that handles GPS, WIFI, and LTE-A operations. This consolidation reduces the number of separate components and simplifies the overall antenna structure while maintaining multi-band capability
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 solution enables a compact wireless communication device that effectively covers multiple frequency bands, enhancing antenna efficiency and supporting carrier aggregation applications while maintaining a high screen-to-body ratio and full front screen design.
Implementation Method 1
the antenna structure includes a housing comprising a system ground plane, a side frame, a middle frame and a back board... enabling efficient radiation across different frequency bands
Data Source
AI summary
An antenna structure with wide radiation bandwidth in a reduced physical space includes a housing, a first feed portion, and a second feed portion. The housing includes a metallic side frame, a metallic middle frame, and a metallic back board. The metallic side frame defines first and second gaps and the metallic back board defines a slot. The slot, and the first and second gaps, create a first radiation portion from the metallic side frame. The first and second feed portions are both electrically connected to the first radiation portion. When the first feed portion feeds current, the current flows through the first radiation portion, toward the second gap to excite a GPS mode and a WIFI 2.4 GHz mode. When the second feed portion feeds current, the current flows through the first radiation portion, toward the first gap to excite a WIFI 5 GHz mode.