Temperature dependence of transmission characteristics of flexible printed circuits in microwave band

2012 ◽  
Vol 48 (15) ◽  
pp. 937 ◽  
Author(s):  
A. Tsuchiya ◽  
H. Sugama ◽  
N. Hidaka ◽  
K. Miyamoto ◽  
S. Tsujino ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Transmission Characteristics ◽  
Microwave Band ◽  
Printed Circuits

Simplified Method of Measuring Magnetic Permeability Temperature Profile for RF Device Applications

2010 ◽  
Vol 67 ◽  
pp. 118-123
Author(s):  
Atsushi Kuramoto ◽  
Takanobu Aoyama ◽  
Tomohiko Kanie ◽  
Yuichi Noro ◽  
Takashi Takeo
Keyword(s):  
Temperature Dependence ◽  
Temperature Profile ◽  
Core Material ◽  
Large Temperature ◽  
Profile Measurement ◽  
Transmission Characteristics ◽  
Ferrite Core ◽  
Performance Isolation ◽  
Device Applications ◽  
Core Permeability

Ferrite is popular as a core material for RF transformers. Since transmission characteristics of RF transformers are affected by the core’s permeability, which has a large temperature dependence, the development of a method for measuring the core permeability temperature profile is important. In this study, a temperature profile measurement of ferrite core permeability has been investigated using a microstrip line method which has the advantage of the circuit being compact in size and therefore suitable for measuring temperature profiles. Based on the results measured with a sample ferrite core, the temperature dependence of RF transformer performance (isolation) is also discussed. Furthermore, basic results of experiments to compensate for the degradation in isolation is presented.

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