US 8,553,804 B2 · Wireless communication system and method with elliptically polarized radio frequency signals

Abstract

In one embodiment, a UWB transmission system includes a pair of crossed linearly polarized antennas, one of which is fed with a UWB signal current, while the second is fed with a temporally orthogonal UWB signal such as the time-derivative of the UWB signal current. The resultant elliptically polarized radiated fields are simultaneously orthogonal in space and orthogonal in time. In another transmission system, a loop and a co-located dipole are fed with the same current to generate signal exhibiting elliptical polarization. When the energies of the transmissions from each antenna are equal, the polarization is circular. Thus a UWB transmitting and receiving system is shown that utilizes signals that are simultaneously spatially orthogonal and temporally orthogonal, and the several combinations of those signal and polarization states encode data for transmission.

Claims17

Dependent claims

An ultra-wideband (UWB) transmission system, comprising:

an antenna system that is configured to emit first and second radiated RF UWB signals that are orthogonally polarized in space when the antenna system is driven by first and second drive UWB signals, respectively;
and
a transmitter, coupled to the antenna system, that drives the antenna system with the first and second drive UWB signals, the first and second drive UWB signals being configured to cause the first and second radiated RF UWB signals to be orthogonal in time and to occur simultaneously in time when emitted by the antenna system;
wherein the antenna system comprises an electric antenna and a magnetic antenna that are co-located and oriented to emit the first and second radiated RF UWB signals that are orthogonal in space, and the transmitter drives both the electric antenna and the magnetic antenna with the same drive signal such that the first and second radiated RF UWB signals are orthogonal in time.

1 more element

A method of transmitting RF ultra-wideband (UWB) signals by a UWB transmission system, the method comprising:

configuring an antenna system to emit first and second radiated RF UWB signals that are orthogonally polarized in space when the antenna system is driven by first and second drive UWB signals;
and
supplying, by a transmitter, the first and second drive UWB signals to the antenna system, the first and second drive UWB signals being configured to cause the first and second radiated RF UWB signals to be orthogonal in time when emitted by the antenna system;
wherein the configuring the antenna system step includes:
co-locating and orienting an electric antenna and a magnetic antenna to form the antenna system and emit the first and second radiated RF UWB signals that are orthogonal in space;
wherein the supplying step includes:
driving, by the transmitter, the electric antenna with the first drive UWB signal;
and
driving, by the transmitter, the magnetic antenna with the second drive UWB signal, the first and second drive UWB signals being the same drive signal such that the first and second radiated RF UWB signals are orthogonal in time.

6 more elements

Dependencies are inferred from the claim text.

Wireless communication system and method with elliptically polarized radio frequency signals

Life of this patent

Wireless communication system and method with elliptically polarized radio frequency signals

Life of this patent

Abstract

Claims17