Multiband Antenna Switching for Compact Mobile Devices
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Solution Overview
Problem
Designing a small-size, wideband antenna element for mobile devices that can support multiple wireless communication frequency bands without increasing the device's size is a challenge, especially as newer devices require more antennas for higher internet speeds.
Innovation Solution
The proposed mobile device incorporates a multiband antenna structure with a switching mechanism that includes a WLAN module, a WWAN module, and four antenna elements, where the antenna elements are selectively coupled to different ports based on control signals to cover frequency bands from 1805 MHz to 2690 MHz and 5150 MHz to 5850 MHz, enabling multiband operations like Wi-Fi, Bluetooth, and LTE MIMO technologies with fewer antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If more antennas are added to support multiple frequency bands and MIMO technologies, then communication performance and speed are improved, but device size increases
Solution Approach 1:
The antenna elements are designed to support multiple frequency bands (sub-6GHz and mmWave) and multiple communication standards (LTE and Wi-Fi) through a unified antenna structure. The switching mechanism enables each antenna element to be dynamically allocated to different communication modules, allowing a reduced number of physical antennas to fulfill the functions of multiple dedicated antennas, thereby improving communication performance without increasing device size
2Device complexity
If antenna elements are shared between WLAN and WWAN modules, then the number of antennas is reduced, but signal interference and module conflicts occur
Solution Approach 1:
The patent implements a dynamic antenna switching mechanism controlled by a switching element that dynamically connects antenna elements to either WLAN or WWAN modules based on real-time communication needs. This dynamic allocation allows the system to adapt to different operating conditions, frequency bands, and signal requirements, ensuring stable signal transmission and preventing interference by dedicating specific antennas to specific modules when needed
Solution Approach 2:
A switching mechanism acts as an intermediary between the antenna elements and the communication modules (WLAN and WWAN). This switching element mediates the connection, intelligently routing signals to the appropriate module based on control signals, thereby preventing direct interference between modules while sharing the physical antenna resources efficiently
Data Source
AI summary
A mobile device includes a WLAN (Wireless Local Area Network) module, a WWAN (Wireless Wide Area Network) module, a first antenna element, a second antenna element, a third antenna element, a fourth antenna element, a first switch element, and a second switch element. The WLAN module has a first port, a second port, and a first control port. The WWAN module has a third port, a fourth port, a fifth port, and a sixth port. The first antenna element is coupled to the third port. The first switch element couples the second antenna element to the first port or the fourth port according to a first control signal. The second switch element couples the third antenna element to the second port or the fifth port according to a second control signal. The fourth antenna element is coupled to the sixth port.