Antenna Switching Control for Compact Wireless Terminals
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Solution Overview
Problem
Wireless terminals with multiple network standards, such as LTE and GSM, face size constraints due to the large size of antennas, particularly the GSM antenna, which limits their compactness and usability.
Innovation Solution
A wireless terminal design incorporating a main antenna and two additional antennas, where the second antenna is optimized to receive signals with a higher frequency band non-overlapping with the GSM band, reducing its size and consequently the terminal's overall size, utilizing a frequency isolation module and switching mechanisms to efficiently manage signal transmission and reception across different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a GSM antenna is used to support the second standard signal, then the terminal can communicate with GSM networks, but the antenna size becomes relatively large, increasing the overall terminal size
Solution Approach 1:
The first antenna is designed as a full-band antenna that can operate across both the first frequency band (super high frequency) and the second frequency band (high frequency). This allows a single antenna to serve multiple functions: receiving first standard signals in the first frequency band and second standard signals in the second frequency band, eliminating the need for separate dedicated antennas for each standard and reducing overall terminal size
Solution Approach 2:
The patent utilizes frequency band parameters to differentiate signal handling. By operating the first antenna at different frequency bands (first frequency band for first standard, second frequency band for second standard), the system achieves multi-mode communication without requiring physically different antenna sizes for each standard
2Reliability
If three antennas (main antenna, diversity antenna, and GSM antenna) are disposed in the wireless terminal, then the terminal supports multiple standards, but the terminal size increases
Solution Approach 1:
The first antenna serves as both a main antenna for first standard communication and a diversity antenna for second standard communication by operating at different frequency bands. This multi-functional design eliminates the need for separate dedicated antennas, reducing the total antenna count from three to two while maintaining signal reception quality
Solution Approach 2:
The patent merges the functions of the main antenna and diversity antenna into a single first antenna that operates across both frequency bands. By combining these functions and using frequency band separation, the system reduces the number of physical antennas required while maintaining the reliability benefits of having both main and diversity reception paths
Data Source
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AI summary
The present invention discloses a wireless terminal and an antenna switching control method for a wireless terminal. The wireless terminal includes a main antenna, a first antenna, and a second antenna. The main antenna is connected to a first radio frequency circuit, and is configured to receive and transmit a first standard signal. A frequency band of the first standard signal includes a first frequency band with a super high frequency and a second frequency band with a high frequency. The first antenna is connected to an antenna end of a frequency isolation module. A high frequency end of the frequency isolation module is connected to the first radio frequency circuit. A low frequency end of the frequency isolation module is connected to a second radio frequency circuit. The first antenna is configured to receive a first standard signal of the first frequency band, and receive and transmit a second standard signal. A frequency band of the second standard signal does not overlap the first frequency band. The second antenna is connected to the first radio frequency circuit, and is configured to receive a first standard signal of the second frequency band. An overall size of the wireless terminal can be reduced by using the second antenna in this solution.