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A 4-channel, vector network analyzer microwave imaging prototype based on software defined radio technology.

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  • 1Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755, USA.

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This study presents a novel 4-channel microwave measurement system using software-defined radio (SDR) technology. The cost-effective system achieves high performance for medical microwave imaging applications.

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Area of Science:

  • Microwave Engineering
  • Medical Imaging Technology
  • Software-Defined Radio Applications

Background:

  • Microwave measurement systems are crucial for various applications, including medical imaging.
  • Existing systems often face limitations in cost, size, and performance.
  • Software-defined radio (SDR) offers a flexible platform for developing advanced measurement systems.

Purpose of the Study:

  • To develop a cost-effective, high-performance 4-channel microwave measurement system.
  • To overcome limitations of existing SDR synchronization methods for multi-channel applications.
  • To adapt telecommunications SDR technology for demanding medical microwave imaging.

Main Methods:

  • Implementation of a 4-channel transmission-based microwave measurement system.
  • Utilization of the B210 USRP SDR (Universal Software Radio Peripheral) with a 70 MHz-6 GHz bandwidth.
  • Development of an external reference synchronization method to enhance reliability and isolation.
  • Adaptation of SDR technology for RF shielding and cross-channel isolation.

Main Results:

  • A prototype 4-channel microwave measurement system was successfully implemented.
  • The external reference method overcame synchronization unreliability issues with B210 SDRs.
  • The system design ensures necessary cross-channel isolation for integrated microwave imaging.
  • The prototype demonstrates potential for performance comparable to commercial vector network analyzers.

Conclusions:

  • The developed SDR-based microwave measurement system is a cost-effective and compact solution.
  • The system's design is suitable for high-performance medical microwave imaging.
  • This approach leverages telecommunications technology for advanced test and measurement tasks.
  • Future expansion to more channels is expected to maintain performance and cost-effectiveness.