Magnetic ceramic absorber

Details Magnetic ceramic absorber Magnetic ceramic absorber

1960-10-19

1977-05-10

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

H01Q 1700

Patent

active

040231747

ABSTRACT:
1. A broadband microwave absorber comprising a sheet of magnetic ceramic material having the general formula, MOFe.sub.2 O.sub.3, in which Fe.sub.2 O.sub.3 is present in an amount in the range of between about 65 and 80 percent by weight of said material and in which MO represents bivalent metal oxides containing at least nickel oxide and zinc oxide, said nickel oxide being present in an amount of between about 3 and 12 percent by weight and said zinc oxide being present in an amount of between about 15 and 25 percent by weight, and including bivalent metal oxides selected from the group consisting of manganese oxide, calcium oxide and magnesium oxide, said manganese oxide being present in an amount of between about 0 and 10 percent by weight, said calcium oxide being present in an amount of between about 0 and 2 percent by weight and said magnesium oxide being present in an amount of between about 0 and 2 percent by weight, said sheet having a thickness which is substantially an electrical quarter wavelength at the lower range of microwave frequencies.

REFERENCES:
patent: 2464006 (1949-03-01), Tiley
patent: 2579267 (1951-12-01), Leverenz et al.
patent: 2745069 (1956-05-01), Hewitt
patent: 2764743 (1956-09-01), Robertson
patent: 2870439 (1959-01-01), Stinehelfer
patent: 2925389 (1960-02-01), Esveldt et al.
patent: 2961407 (1960-11-01), Piekarski
patent: 2977591 (1961-03-01), Tanner
patent: 2985880 (1961-05-01), McMillan
"The Schornsteinfeger Project"; May 1945; Combined Intelligence Objectives ub-Committee Report Item No. I File No. XXVI-24; Declassified Apr. 26, 1960; pp. 25-29, 89 and 93-95 relied on.
"Work of Professor Huttig on Ferromagnetic Substances for Use in Radar Camouflages"; 1946; B.I.O.S. Final Report No. 871 Item No. 1; British Intelligence Objectives Sub-Committee; pp. 4, 5 and 14 to 18 relied on; Declassified Apr. 26, 1960.
"Darkflex-A Fibrous Microwave Absorber"; NRL Report 4137, Apr. 20, 1953; Naval Research Laboratory, Washington, D.C.; 10 pages.
Montgomery, C. G.; Principles of Microwave Circuits; MIT RLS vol. 8; McGraw Hill 1948; pp. 396-400.

Affiliated with

Also associated with

Rating

Magnetic ceramic absorber does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Magnetic ceramic absorber, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic ceramic absorber will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1986888