Patent · US Expired

Attenuation apparatus for an aerial array

US4591867A · kind A · utility

1Cited by

3References

5Claims

0Family size

Assignee

Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

Allan H. E. Englund · Alvesta, SE
Stefan Eriksson · Bromma, SE

Key dates

Filing date	Feb 10, 1984
Grant date	May 27, 1986
Priority date	—
Expiry date	Feb 10, 2004

Classification

Technology area (CPC H)Electricity
CPC primaryH01Q1/525
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

Attenuating apparatus is provided for reducing disturbance between transmitting and receiving aerials mounted vertically one above the other. Attenuation is achieved by a grounded screen (1) and a spacer, both mounted between the aerials. The screen is provided with cutouts (6) having a pitch (c) of .lambda./2, where .lambda. is the mean frequency of the pertinent frequency band and .lambda./4 is the depth (d) of the cutouts. The length of the spacer is 0.70.lambda..

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.