Design and Verification of On-Chip Impedance-Matching Circuit Using Transmission-Line Theory for 2.4 GHz-Band Wireless Receiver Front-End

2006 ◽  
Vol E89-C (12) ◽  
pp. 1888-1895 ◽  
Author(s):  
H. KANAYA ◽  
R. K. POKHAREL ◽  
F. KOGA ◽  
K. YOSHIDA
Keyword(s):  
Transmission Line ◽  
Impedance Matching ◽  
Transmission Line Theory ◽  
Wireless Receiver ◽  
Front End ◽  
Line Theory ◽  
On Chip

scholarly journals The problems in the quarter-wavelength model and impedance matching theory in analysising microwave absorption material

2021 ◽  
Author(s):  
Ying Liu ◽  
Yue Liu ◽  
Michael GB Drew
Keyword(s):  
Transmission Line ◽  
Microwave Absorption ◽  
Reflection Loss ◽  
Impedance Matching ◽  
Matching Theory ◽  
Transmission Line Theory ◽  
Scattering Parameter ◽  
Quarter Wavelength ◽  
Line Theory ◽  
Absorption Theory

Abstract It is shown here that many concepts in current mainstream microwave absorption theory are used inappropriately. Reflection loss RL has been used to characterize microwave absorption from material instead of film and the results have been rationalized by impedance matching theory. The quarter-wavelength model states that the reflection of microwaves with wavelength l from a film is minimized if the thickness of the film is m l /4 where m is an odd integer. But we show here that the model is wrong because the phase effects from interfaces have been overlooked. RL is an innate property only for metal-backed film. Impedance matching theory is developed from transmission-line theory for scattering parameter s 11 but cannot be generalized to RL.

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