Phase noise performance of microwave analog frequency dividers: application to the characterization of oscillators up to the millimeter-wave range

1999 ◽  
Vol 46 (4) ◽  
pp. 935-940 ◽  
Author(s):  
O. Llopis ◽  
M. Regis ◽  
S. Desgrez ◽  
J. Graffeuil
Keyword(s):  
Phase Noise ◽  
Millimeter Wave ◽  
Noise Performance ◽  
Frequency Dividers ◽  
Millimeter Wave Range ◽  
Phase Noise Performance ◽  
Wave Range

scholarly journals Characterization of the dielectric properties of water and methanol in the D-band using a quasi-optical spectroscopy

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Xiaoming Liu ◽  
Junsheng Yu
Keyword(s):  
Optical Spectroscopy ◽  
Millimeter Wave ◽  
Calibration Method ◽  
Dielectric Measurement ◽  
Fundamental Parameter ◽  
Millimeter Wave Range ◽  
Reference Medium ◽  
Wave Range ◽  
Free Space Method

AbstractThis work presents the measurement of the permittivities of water and methanol in the D-band. Water is a reference medium for dielectric measurement. The dielectric permittivity of water in the millimeter wave range is a fundamental parameter in many applications, and needs to be investigated systematically. The measurement is conducted using a quasi-optical spectroscopy, which is an improved free-space method more suitable for the millimeter wave range. The theoretical formulae are derived using the signal-flow chart method, which is developed specially for multi-layer operation. This model enables one measure liquid samples. A non-calibration method has been developed to retrieve the permittivity. Water and methanol are measured at several temperatures. The measured results agree with published results in a 4% discrepancy. This work will add new measured data to the permittivities of water and methanol over the whole D-band.

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