Tunable Antenna Branch Layout for Transmit-Receive Isolation
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Solution Overview
Problem
Current communications terminals face challenges in achieving adequate antenna isolation due to the integration of transmit and receive antennas, which complicates dynamic tuning and frequency band support.
Innovation Solution
A tunable antenna design is introduced, where separate transmit and receive antennas are connected to a radio frequency integrated circuit through independent frequency modulation branches, allowing for separate adjustment of frequency bands and improved isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If transmit and receive antennas are integrated together in a current duplexer, then device complexity is reduced, but antenna isolation deteriorates making it difficult to meet product requirements
Solution Approach 1:
The patent divides the integrated antenna system into separate transmit antenna and receive antenna components. The transmit antenna and receive antenna are physically separated and independently configured, allowing for optimized isolation between them while maintaining manageable device complexity through modular design.
2Adaptability or versatility
If dynamic tuning is performed on an integrated antenna system, then adaptability to different frequency bands is improved, but isolation between transmit and receive antennas deteriorates
Solution Approach 1:
The patent implements dynamic tuning capability in the frequency modulation branch that can independently adjust the transmit antenna and receive antenna frequencies. This dynamic configuration allows the system to adapt to different frequency bands while maintaining isolation by separately controlling the tuning of each antenna through independent frequency modulation branches.
3Ease of manufacture
If separate transmit and receive antennas are used with independent frequency modulation branches, then antenna isolation is improved, but device complexity increases
Solution Approach 1:
The patent employs a shared frequency modulation branch design that can serve both transmit and receive antenna functions. The frequency modulation circuitry is designed to be multi-functional, capable of independently tuning different frequency bands for both antennas while using common control mechanisms, thereby reducing overall device complexity despite the separate antenna configuration.
Data Source
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AI summary
This application provides a tunable antenna and a communications terminal. The tunable antenna includes a radio frequency integrated circuit, and a first frequency modulation branch separately connected to the radio frequency integrated circuit; further includes a first antenna, where the first antenna is connected to the radio frequency integrated circuit through the first frequency modulation branch; and further includes a second antenna, where the second antenna is connected to the radio frequency integrated circuit through a second frequency modulation branch. The first antenna corresponds to a first frequency, the second antenna corresponds to a second frequency, and the first frequency and the second frequency are respectively a transmit frequency and a receive frequency in a specified frequency band. It can be learned from the foregoing description that, when the tunable antenna is being designed, the first antenna and the second antenna are respectively connected to the radio frequency integrated circuit through the frequency modulation branches. Therefore, frequency bands of the first antenna and the second antenna can be separately adjusted. This improves isolation between the second antenna and the first antenna.