Antenna Switch Modules Using Resonance Impedance Circuits
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Solution Overview
Problem
Antenna switch modules in RF systems consume power and introduce dissipative loss, reducing battery life in mobile devices, especially when handling multiple frequency bands like GSM 850/900 and GSM 1800/1900, due to the use of active switch devices.
Innovation Solution
The implementation of a resonance impedance circuit, such as a ¼ wave impedance transformer or parallel LC circuit, is used to isolate ports, reducing the need for active switches and minimizing power consumption by providing high impedance paths and harmonic filtering, thereby improving efficiency and extending battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If active switch devices are used to connect antenna to multiple frequency bands, then the antenna switch module can handle multiple transmit and receive paths, but power consumption increases and dissipative loss is introduced
Solution Approach 1:
The patent changes the operating parameters of the switch devices based on frequency bands. Different switches are configured for different frequency ranges (e.g., first switch for first frequency band, second switch for second frequency band), allowing the system to adapt to multiple bands while minimizing power consumption by activating only the necessary switch for each band
Solution Approach 2:
The patent extracts and removes unnecessary active switch devices from the signal path for frequencies they are not designed to handle. By taking out the second switch from the first frequency band path and the first switch from the second frequency band path, the design eliminates unnecessary power consumption and dissipative loss while maintaining the ability to handle multiple frequency bands
2Reliability
If active switch devices are used for switching between frequency bands, then port isolation can be achieved, but dissipative loss increases reducing battery life
Solution Approach 1:
The patent applies local quality by providing different isolation mechanisms for different frequency bands. The first switch provides isolation for the first frequency band while the second switch provides isolation for the second frequency band, allowing each band to have optimized isolation characteristics without the other switch introducing dissipative loss
Solution Approach 2:
The patent converts the potential harm of having multiple active switches (which would cause dissipative loss) into a benefit by strategically placing switches only where needed. The switches are positioned to provide necessary isolation and signal routing while their absence in other paths eliminates unnecessary energy loss, turning a potential disadvantage into an advantage
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
This approach significantly reduces power dissipation and enhances the efficiency of antenna switch modules, leading to longer battery life and improved signal quality by eliminating active components and their associated losses.
Implementation Method 1
a resonance impedance circuit that connects at least one of the second transmit port or the second receive port to the antenna, the resonance impedance circuit having components selected to provide a high impedance path when signals are being transmitted at the first frequency
Data Source
AI summary
Antenna switch modules and methods of making the same are provided. In one implementation, an antenna switch module includes a first transmit and first receive port that are respectively connected to at least one antenna series switches. The first receive and transmit port receive and transmit signals on a first frequency. In one implementation, a second transmit and second receive port are connected to the at least one antenna and transmit and receive signals on a second frequency. In this implementation, the second receive port is connected to the at least one antenna via a series switch but the second transmit port is connected to the at least one antenna via a inductive resonance circuit that provides impedance to isolate the second transmit port when the first transmit port or receive port is transmitting or receiving via the at least one antenna.