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Method to Change the Through-Hole Structure to Broaden Grounded Coplanar Waveguide Bandwidth.
Jiangmiao Zhu1, Zhaotong Wan1, Kejia Zhao2
1Faculty of Information Technology, Beijing University of Technology, Beijing 100024, China.
Sensors (Basel, Switzerland)
|May 13, 2023
Summary
This study modifies grounded coplanar waveguides (GCPWs) for millimeter wave applications. The enhanced GCPW design widens bandwidth, enabling better calibration of broadband oscilloscope probes up to 60 GHz.
Area of Science:
- Electrical Engineering
- Electromagnetics
- Microwave Engineering
Background:
- Millimeter wave (mmWave) transmission lines are crucial for high-frequency applications.
- Grounded coplanar waveguides (GCPWs) are specialized transmission lines used in mmWave circuits.
- Calibration of broadband oscilloscope probes requires precise transmission line characteristics.
Purpose of the Study:
- To investigate a method for widening the bandwidth of GCPWs.
- To analyze the impact of through-hole structures on GCPW performance.
- To validate the enhanced GCPW design for mmWave probe calibration.
Main Methods:
- Investigated modifying the through-hole structure of GCPWs.
- Utilized COMSOL Multiphysics for electromagnetic simulation.
- Fabricated GCPW prototypes.
- Measured S-parameters using a vector network analyzer.
Main Results:
- The modified GCPW design demonstrated a wider bandwidth.
- Simulations verified the effect of through-hole arrays on bandwidth.
- Fabricated GCPWs exhibited insertion loss > -3 dB and return loss < -10 dB from DC to 60 GHz.
Conclusions:
- The modified GCPW design meets the performance requirements for mmWave applications.
- The enhanced GCPW is suitable for calibrating broadband oscilloscope probes.
- The study validates the effectiveness of structural modification for improving GCPW performance.
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