Microwave needle dielectric sensors

Details Microwave needle dielectric sensors Microwave needle dielectric sensors

1992-09-14

1993-07-13

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

324633, 324642, 324643, 324646, 343790, 343791, G01R 2302

Patent

active

052277305

ABSTRACT:
Method and apparatus for in vivo or in vitro sensing of complex dielectric properties of lossy dielectric materials, particularly biological tissue. Configured as a needle-like dielectric sensor, a coaxial cable (1) having a circumferential gap (12) in the shield (2) is wrapped with an electrically thin dielectric substrate (18). The cable center conductor (6) extends immediately past gap (12) and is shorted to cable shield (2). A thin conductive dipole resonator (16) is positioned on substrate (18) and over feed gap (12) to achieve inductive coupling between the cable center conductor (6) and the dipole resonator (16) through gap (12). Superstrate (22), which could be a dielectric catheter, covers the entire sensor assembly (10). By measurement of the resonator resonant frequency and the input impedance matching factor at the resonant frequency, the real and imaginary dielectric components (.epsilon.', .epsilon.") of the test material into which the sensor is inserted are determined.

REFERENCES:
patent: 3750184 (1973-07-01), Kuecken
patent: 4104584 (1978-08-01), Miyai
patent: 4410893 (1983-10-01), Grifee
Tiuri: "A Microwave Instrument . . . " Journal of Microwave Power, vol. 9, pp. 117-121--Jun. 1974.
Xu, Y., et al. "Theoretical and Experimental Study of Measurement of Microwave Permittivity Using Open Ended Elliptical Coaxial Probes," IEEE Trans. AP-40(1), Jan. 1992, pp. 143-150.

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