US 2009/0156118 A1 · CIRCULARLY POLARIZED OMNIDIRECTIONAL IN-BUILDING SIGNAL BOOSTER APPARATUS AND METHOD

Abstract

A rebroadcasting apparatus for mobile media includes a receiving antenna and a transmitting antenna. The signal to be rebroadcast is received with a circularly polarized directional antenna. The transmitting antenna has circular polarization opposite to the polarization of the receiving antenna. Amplifiers and filters may be included between receiving and transmitting antennas to regulate retransmitted signal quality. The transmitting antenna uses one or more bays of quasi-helical dipole radiators excited using manifold feed equipped with tuning paddles. The transmitting antenna may be formed from light-weight sheet metal or other readily mass-produced materials. The transmitting antenna may be housed within an ordinary security camera enclosure or similar radio-transparent housing.

Claims32

Dependent claims

An antenna having at least one bay, wherein a first antenna bay comprises:

a coaxial input port with an outer conductor that serves as a reference potential;
a first radiative component, comprising:
a first substantially arcuate dipole positioned as a quasi-helix with reference to a vertical antenna axis, wherein a location on the dipole proximal to a midpoint thereof is a reference node of the dipole, and wherein a location on the dipole distal to the midpoint thereof is a feed node of the dipole;
a number n−1, for n greater than or equal to 1, of additional arcuate dipoles, substantially identical to the first dipole, distributed substantially uniformly with azimuth about the vertical antenna axis;
and
a cross arm, having a hub in a plane perpendicular to the vertical axis, connected to the input port outer conductor, and operative to connect the port to the n dipoles at the respective reference nodes on the n dipoles;
and
a power distribution manifold, comprising:
a feed line originating from a center conductor of the coaxial input port;
a manifold feed plate central node connected to the feed line;
a number n of feed blades connecting the central node to the respective feed nodes of the n dipoles;
and
a number n of tuning paddles respectively connected to the feed blades.

10 more elements

A system for rebroadcasting a source signal originating from a location external to the system, comprising:

means for receiving an electromagnetic signal from a broadcast radio transmission, wherein the means for receiving has elliptical polarization with a first handedness;
means for retransmitting an electromagnetic signal from a broadcast radio transmission, wherein the means for retransmitting has elliptical polarization with a second handedness, opposite to the handedness of the means for receiving;
and
means for coupling a signal from the means for receiving to the means for retransmitting.

1 more element

Dependencies are inferred from the claim text.

Circularly polarized omnidirectional in-building signal booster apparatus and method

Life of this patent

Circularly polarized omnidirectional in-building signal booster apparatus and method

Life of this patent

Abstract

Claims32