Development of a SOLT Calibration Substrate and a Probe with Pogo Pins

• Main Authors: Tsung-Yen Chen, 陳宗彥
• Other Authors: Wei-chen Lee
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/32949178806132550704

碩士 === 國立臺灣科技大學 === 機械工程系 === 104 === For high-frequency measurement, the RF probe is weak due to its tiny pins. In addition, it is necessary to purchase the expensive SOLT calibration substrate. To reduce the high cost, the study developed a ground-signal-ground microwave probe of 1 mm pitch with pogo pins. Because the pins are stronger so as to increase measurement efficiency without damaging the pins. Furthermore, we designed an SOLT calibration substrate made of FR4 for this probe. The insertion loss of a trace on the PCB was measured by the probe to be within ±1.2 dB and return loss less than -20 dB within 0 to 10 GHz after calibration. Those parameters needed for the probe were obtained by using CST microwave studio, VNA, TDR. The correct compensation of capacitance and inductance could suppress measurement ripples. For return loss, the correct value of capacitance and inductance can improve the trend of curve effectively. The discrepancy of capacitance and inductance did not influence the insertion loss below 5 GHz. The more accurate the compensated values are, the more stable the higher frequency measurement results are. The results of measurement were even similar to RF probe upon 8 GHz by using the correct valve, which was directly measured from the Open and Short model on substrate. This designed SOLT substrate with correct parameters made the calibration results of RF probe successfully similar to CS-10 calibration substrate below 10 GHz.