Antenna Switch Bandstop Filter Multiband Signal Attenuation
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Solution Overview
Problem
Current mobile communication devices often require multiple antennas to support various wireless communication standards, leading to increased size and cost, and struggle with signal disturbances across different frequency bands.
Innovation Solution
A circuit arrangement incorporating an antenna switch and a bandstop filter, controlled by a transistor, which selectively attenuates disturbing frequencies, allowing for improved signal transfer and reduced size and cost in multiband devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are implemented to support various wireless communication standards, then the device can operate under multiple communication standards, but the size and cost of the device increase
Solution Approach 1:
The patent implements a single antenna that can operate across multiple frequency bands (e.g., GSM 900/1800, DCS 1800, PCS 1900, GPS 1575 MHz) by using a multiband antenna switch module. This allows one antenna to perform the function of multiple antennas, reducing device size while maintaining support for various wireless communication standards
2Adaptability or versatility
If multiple antennas are implemented to support various wireless communication standards, then the device can operate under multiple communication standards, but the cost of the device increases
Solution Approach 1:
The multiband antenna switch module enables a single antenna to serve multiple frequency bands and communication standards, reducing the need for multiple antennas and associated components. This consolidation lowers manufacturing costs while maintaining versatility across GSM, DCS, PCS, and GPS bands
3Volume of moving object
If a single antenna is used to receive signals in multiple frequency bands, then the device size is reduced, but signal disturbances occur across different frequency bands
Solution Approach 1:
The patent extracts and removes disturbing frequencies from the signal path by implementing a bandstop filter that specifically targets and attenuates interfering frequency components (e.g., second harmonics) while allowing desired frequency bands to pass through unchanged, thus eliminating signal disturbances in single-antenna multiband operation
Solution Approach 2:
The bandstop filter acts as an intermediary component between the antenna and the communication modules, selectively blocking disturbing frequencies before they can cause interference. This mediator approach allows the single antenna to serve multiple bands without signal degradation
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
Enables reliable and undisturbed transmission of high frequency signals across multiple bands, enhancing the performance and electrical characteristics of mobile communication devices while maintaining a compact design.
Implementation Method 1
a bandstop filter that is coupled to at least one port of the antenna switch. The bandstop filter is configured to attenuate a disturbing frequency
Data Source
AI summary
Implementations are presented herein that include an antenna switch that includes a plurality of ports. A bandstop filter is coupled to at least one of the plurality of ports of the antenna switch and the bandstop filter is configured to attenuate a disturbing frequency. A transistor is configured to receive a control signal and to switch on the bandstop filter responsive to the control signal.