DocumentCode :
3558377
Title :
Phase comparator at 2.5 GHz
Author :
Baribaud, M. ; Caerou, J.-C. ; Kamarei, Mahmoud
Author_Institution :
ENSERG, Laboratoire d´Electromagn????tisme, Grenoble, France
Volume :
133
Issue :
3
fYear :
1986
fDate :
6/1/1986 12:00:00 AM
Firstpage :
183
Lastpage :
186
Abstract :
Images of biological objects can be obtained by exploration with microwaves. Reconstitution of the image takes place by distribution in phase and in amplitude of the diffracted field on a portion of a spherical surface. Obtaining these parameters requires a precision phase comparator at a working frequency of 2.5 GHz. The comparator consists of an arrangement of four couplers of 3 dB, one phase shifter of 90¿¿ followed by filtering and detection circuits such that one obtains: (¿¿l¿¿¿¿2) = arctan V1/V2, where V1 and V2 are measured directly. The realised system permits a phase measurement with an error of less than 5¿¿ at the nominal frequency (2.5 GHz) for levels of power between ¿¿10 dBm and ¿¿30 dBm.
Keywords :
biological techniques and instruments; microwave measurement; phase comparators; phase shifters; solid-state microwave circuits; 2.5 GHz; 3 dB; amplitude; biological objects; couplers; detection circuits; diffracted field; filtering; image reconstitution; microwaves; phase; phase shifter; precision phase comparator; spherical surface;
fLanguage :
English
Journal_Title :
Microwaves, Antennas and Propagation, IEE Proceedings H
Publisher :
iet
Conference_Location :
6/1/1986 12:00:00 AM
ISSN :
0950-107X
Type :
jour
DOI :
10.1049/ip-h-2.1986.0032
Filename :
4642899
Link To Document :
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