Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Patent
1994-10-20
1996-03-26
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
324642, G01R 2704
Patent
active
055023940
ABSTRACT:
In order to measure the amplitude and the phase of the reflection coefficient of a structure (S) such as a radar protection radome, particularly following a repair, a measuring device is proposed, whereof a portable part (10) makes it possible to transform the microwave measuring and reference signals into low frequency signals. These low frequency signals are then transferred by flexible cables (16, 17) to a calculating part (12, 14) without it being possible to create phase distortions by twisting of the cable. The signals are transformed by giving the portable part, in addition to the main microwave generator (18), a second microwave generator (32), whose frequency (f.sub.2) differs from that (f.sub.1) of the main generator by a given low frequency (f.sub.0). Microwave mixers (38, 42) use the radiation emitted by the second generator (32) in order to give the measuring signal and the reference signal, initially at the frequency (f.sub.1), the low frequency (f.sub.0).
REFERENCES:
patent: 3025463 (1962-03-01), Fairborn
patent: 3562642 (1971-02-01), Hoshschild
patent: 3936736 (1976-02-01), Ray
patent: 4097796 (1978-06-01), Lunden
patent: 5233306 (1993-08-01), Misra
patent: 5371505 (1994-12-01), Michaels
patent: 5384543 (1995-01-01), Bible et al.
Aerospatiale Socie/ te/ Nationale Industrielle
Do Diep
Wieder Kenneth A.
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