Abstract: An embodiment of a dual port antenna system includes a balanced 90° hybrid coupler integrated with a crossed-field antenna to provide stable high isolation between the two input ports of the system. Unlike conventional antennas, the crossed-field antenna is made up of two radiating elements separately fed at a phase difference of 90°. This allows all of the power from the two transmitters to be coupled to the antenna via the hybrid coupler. A balanced 90° hybrid coupler provides isolation between the two ports of the system by matching the electrical characteristics of the antenna. The isolation between ports provided by the balanced 90° hybrid coupler is approximately 35-40 db which is sufficient to allow the independent operation of transceivers connected to the input ports. The crossed-field antenna exhibits loose electrical coupling so that the electrical characteristics remain stable and sufficiently high isolation between input ports is maintained.

Abstract: According to one embodiment, a system is disclosed. The system includes a first dipole antenna, a second dipole antenna located orthogonal to the first dipole antenna, and a cross balance/unbalance (balun) feed coupled to the first dipole antenna and the second dipole antenna.

Abstract: According to one embodiment, a system is disclosed. The system includes a first dipole antenna, a second dipole antenna located orthogonal to the first dipole antenna, and a cross balance/unbalance (balun) feed coupled to the first dipole antenna and the second dipole antenna.

Abstract: An embodiment of a dual port antenna system includes a balanced 90° hybrid couple integrated with a crossed-field antenna to provide stable high isolation between the two input ports of the system. Unlike conventional antennas, the crossed-field antenna is made up of two radiating elements separately fed at a phase difference of 90°. This allows all of the power from the two transmitters to be coupled to the antenna via the hybrid coupler. A balanced 90° hybrid coupler provides isolation between the two ports of the system by matching the electrical characteristics of the antenna. The isolation between ports provided by the balanced 90° hybrid coupler is approximately 35-40 db which is sufficient to allow the independent operation of transceivers connected to the input ports. The crossed-field antenna exhibits loose electrical coupling so that the electrical characteristics remain stable and sufficiently high isolation between input ports is maintained.

Abstract: Frequency spectrums are determined for all possible codes given a predetermined number of bits in a code. A subset of these codes is formed based on spectral properties of codes in a desired frequency band. This subset of code is then used to encode data prior to transmission over a high-speed data bus to reduce undesirable emissions on targeted frequency bands.

Abstract: A method and an apparatus for passive interference cancellation are provided. The apparatus includes a first and second radio operating on a same frequency band, a first and second coupler, and a first phase shifter. The first radio includes a first radio transceiver and a first radio antennae. The second radio includes a second radio antennae located a predetermined distance from the first radio antennae. A first coupler and second coupler are adjusted according to a coupling loss between the antennas. The first radio transceiver transmits a first signal. The first signal is divided by the first coupler to a first portion and a second portion. The first portion moves through the first radio antennae and is received by the second radio antennae. The second portion moves through the first phase shifter. Both portions of the first signal meet and cancel to achieve a specified isolation between the radios.