Abstract
When designing a microwave circuit involving substrate integrated coaxial lines (SICLs), it is important to know what real crosstalk between SICLs is. A measured crosstalk will be a good reference value in a practical design. In addition, it is also needed to compare and check the crosstalk from the simulation and calculation formula with measured results. However, it is very difficult to measure the crosstalk between SICLs because it is theoretically very low. In this study, for the first time, the crosstalk characteristics of a SICL are evaluated through experimental design and measurements. By adjusting the layout of the structures and implementing controlled experiments, interference caused by the presence of leaks and radiation at the interface and structural transitions is effectively suppressed. The experimental results show that for two parallel SICLs with a length of 30 mm and an interval of 5 mm, the isolation is greater than 80 dB for the measured frequency range of 1–8 GHz, significantly better than the results of the grounded coplanar waveguide (GCPW).
Highlights
For microwave systems that require a compact size, a high-precision control, or a high power, undesirable signal crosstalk and leakage can lead to many problems
The measurement results of the substrate-integrated coaxial line (SICL)–grounded coplanar waveguide (GCPW) (Substrate Integrated Coaxial Line - Grounded CoPlanar Waveguide) transition [18] and the empty-SICL–microstrip transition [19] illustrate that a SICL is compatible with
The GCPW test set (GCPW-TS) were equipped with a GCPW parallel coupling line and test auxiliary were equipped with a GCPW parallel coupling line and test auxiliary components, including 8 components, including 8 SICL-GCPW transitions, 4 SMA connectors, 4 90° bends and shielding
Summary
For microwave systems that require a compact size, a high-precision control, or a high power, undesirable signal crosstalk and leakage can lead to many problems. It is difficult to achieve such an isolation performance for systems implemented or integrated using conventional microstrip lines or coplanar waveguides. The measurement results of the SICL–GCPW (Substrate Integrated Coaxial Line - Grounded CoPlanar Waveguide) transition [18] and the empty-SICL–microstrip transition [19] illustrate that a SICL is compatible with. When designing a microwave circuit concerning SICLs, it is important to measurement and verification of its high isolation is of great necessity and significance. An experimental design and measurements on the crosstalk characteristics by leakages and radiation at the interfaces and structural transitions is introduced. A method to suppress interference caused measurement data are obtained to verify the superiority of a SICL in crosstalk performances. The related measurement data are obtained to verify the superiority of a SICL in crosstalk performances
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