Stacked dual dipole MMDS feed

Details Stacked dual dipole MMDS feed Stacked dual dipole MMDS feed

1993-03-15

1994-03-08

Hajec, Donald

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343840, 343821, 343822, H01Q 928, H01Q 1919

Patent

active

052931757

ABSTRACT:
A multichannel, multipoint distribution services (MMDS) dipole antenna for receiving multiple channels in the S-band frequency range of 2000 and 3000 MHz is formed from a printed circuit board which is directly connected to a coaxial cable. On the printed circuit board are etched two stacked dipoles. Each of the dipoles has a first one-half element etched on the first side of the printed circuit board and the second one-half element etched on the second side of the printed circuit board. The first and second dipoles are oriented to be in phase with each other and are separated from each other at a wavelength spacing between 0.25 lambda and 0.40 lambda. The antenna of the present invention further uses a phase combining circuit and an impedance matching circuit etched on the printed circuit board for combining in phase the polarized signals, for canceling the non-polarized signals at 0.degree. and 180.degree., from the two stacked dipoles and for matching the impedance from the two dipoles to the impedance of the coaxial cable.

REFERENCES:
patent: 3587110 (1971-06-01), Woodward
patent: 3747114 (1973-07-01), Shyhalla
patent: 3887925 (1975-06-01), Ranghelli et al.
patent: 4736207 (1988-04-01), Siikarla et al.
patent: 4758843 (1988-07-01), Agrawal et al.
patent: 4812855 (1989-03-01), Coe et al.
patent: 4866451 (1989-09-01), Chen
patent: 5202699 (1993-04-01), Hemmie et al.

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