Dual-band octafilar helix antenna

Multiple band wireless telephone with multiple antennas

Coaxial-waveguide rotary coupling assemblage

180~ power divider for a helix antenna

Quadrifilar helix antenna and feed network

Filter technique for increasing antenna isolation in portable communication devices

Provided is a system and method for reducing the effects of antenna coupling by increasing the isolation between closely mounted antennas on a portable wireless communications device. Increased isolation is achieved by providing a ceramic resonator in the path of each of the antennas. The ceramic resonator placed in the path of a particular antenna reduces the effects of coupling caused by a particular one of the other antennas by rejecting signals associated with the particular antenna.

Quadrifilar helix antenna and feed network

A quadrifilar antenna is comprised of four radiators which, in the preferred embodiment, are etched onto a radiator portion of a microstrip substrate. The microstrip substrate is formed into a cylindrical shape such that the radiators are helically wound. Also etched onto the microstrip substrate is a feed network that provides 0°, 90°, 180° and 270° signals to the antenna radiators. The feed network utilizes a combination of one or more branch line couplers and one or more power dividers to accept an input signal from a transmitter and to provide therefrom the 0°, 90°, 180° and 270° signals needed to drive the antenna. For receive operations, the feed network utilizes these same components to receive the 0°, 90°, 180° and 270° signals from the antenna radiators and to provide a single output signal to a communications receiver. The power divider accepts an input signal and provides therefrom two output signals differing from each other in phase by 180°. The branch line coupler accepts an input signal and provides therefrom two output signals differing from one another in phase by 90°.

Multiple band wireless telephone with multiple antennas

A wireless telephone (102) includes a telephone transceiver (104), GPS receiver (106), and Bluetooth transceiver (108). The telephone antenna (110) is external, and the Bluetooth antenna (120) is internal. The GPS receiver (106) may be driven by its own internal antenna (326), or via a signal separator (116), (216), by either of the other antennas (110), (120).

180 tehojakaja helix-antennia varten

Antena helicoidal octafilamentar com banda dupla

Dispositivo para fornecer dois sinais de saída tendo uma fase relativa de 180 graus entre si e dispositivo para fornecer dois sinais de saída que differem em fase em 180 graus

Kahdeksanlankainen kaksikaistakierukka-antenni

Kahdeksanlankainen kaksikaistakierukka-antenni

Conjunto de acoplamento rotativo de guia de ondas co-axial