Transformer-Based Antenna Switching Network for 5G
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing antenna switching networks in wireless communication systems, particularly for 5G, suffer from significant power leakage due to off-capacitance in switch transistors, leading to inefficiencies in millimeter wave frequencies.
Innovation Solution
A transformer-based antenna switching network is introduced, utilizing a transformer with a primary and secondary winding, and switch transistors coupled to the secondary winding to selectively couple antennas, minimizing power leakage by resonating out off-capacitance and matching impedances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If switch transistors are used for antenna switching, then antenna selection is enabled, but power leakage occurs due to off-capacitance
Solution Approach 1:
A transformer is introduced as an intermediary component between the switch transistors and the antennas. The transformer couples to the secondary winding of the switch network and provides impedance transformation, which reduces the impact of off-capacitance leakage from the switch transistors. This intermediary structure allows the switch transistors to perform antenna selection while the transformer minimizes the power leakage caused by their off-capacitance.
Solution Approach 2:
The patent changes the impedance parameters in the switching network by introducing a transformer with specific turns ratio. By transforming the impedance seen by the switch transistors, the operating conditions are optimized to reduce power leakage. The transformer modifies the electrical parameters (impedance, voltage, current) in the circuit to minimize the harmful effects of off-capacitance while maintaining antenna switching functionality.
2Adaptability or versatility
If traditional switching networks are used, then antenna switching is achieved, but efficiency is poor at millimeter wave frequencies
Solution Approach 1:
The patent optimizes the electrical parameters of the switching network by incorporating a transformer designed for millimeter wave frequencies. The transformer's impedance transformation capability is specifically tuned to improve efficiency at these high frequencies, where traditional switching networks suffer from significant losses. This parameter optimization enables effective antenna switching while maintaining high system efficiency at millimeter wave frequencies.
Solution Approach 2:
The transformer serves as a mediator that adapts the switching network to operate efficiently at millimeter wave frequencies. It provides the necessary impedance matching and signal coupling that traditional direct-switching architectures cannot achieve at these high frequencies, thereby improving overall system productivity and efficiency.
3Ease of operation
If switch transistors with off-capacitance are used, then antenna switching is possible, but power leakage is significant
Solution Approach 1:
The transformer is positioned as an intermediary between the easily operable switch transistors and the antennas. It maintains the ease of operation provided by the switch transistors while simultaneously reducing the power leakage caused by their off-capacitance through impedance transformation and proper coupling.
Solution Approach 2:
The patent converts the harmful effect of off-capacitance into a manageable parameter by using the transformer to transform the impedance seen by the switch transistors. The off-capacitance, which would normally cause significant power leakage, is transformed along with the other electrical parameters, and its harmful effect is minimized through proper transformer design and impedance matching.
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 transformer-based network reduces power leakage and improves efficiency by inversely proportional on-resistance, allowing for effective antenna selection and isolation, even at millimeter wave frequencies.
Implementation Method 1
a first transformer including a primary winding and a secondary winding, wherein the primary winding of the first transformer is operably coupled to a power amplifier
Implementation Method 2
minimizing power leakage by resonating out off-capacitance
Implementation Method 3
switch transistors coupled to the secondary winding to selectively couple antennas
Implementation Method 4
matching impedances
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A transformer-based antenna switching network includes a transformer having a secondary winding that extends between a first terminal and a second terminal. The first terminal couples to ground through a first switch and connects to a first antenna. The second terminal couples to ground through a second switch and connects to a second antenna.