POWERWAVE COMTEK OY Patent applications |
Patent application number | Title | Published |
20100149066 | MASTHEAD AMPLIFIER UNIT - An amplifier unit to adapted to be placed in an antenna mast of a radio system that uses time division duplex. The amplifier unit includes transmitting and receiving branches in parallel, with the transmitting branch being used as a bypass path for a low noise amplifier (LNA) in the receiving branch. The unit is set to the transmitting mode, receiving mode and bypass mode by means of pin diode switches. A passive bypass mode comes into effect automatically, if the unit loses its supply voltage. At least one pin switch is located transversely in the transmitting branch for switching off the unit, when it is set to the receiving mode. The structure of the unit advantageously includes another, redundant, transmitting branch with series switches, which branch is used for improving the characteristics of the transmission path for transmitting signals, when the biasing of the pin switches is possible. | 06-17-2010 |
20100007442 | TUNING ELEMENT AND TUNABLE RESONATOR - A resonator is provided with a tuning element based on piezoelectricity. The piezoelectric basic element includes at least one piezoelectric layer and a metal layer. Such a basic element is first coated with a thin insulating layer and then with a good conductor. The thickness of the conductive coating is greater than the skin depth of a field corresponding to the operating frequency of the structure in the conductor. The tuning element formed in this manner is fastened on, e.g., some inner surface of the resonator cavity and acts to change the natural frequency of the resonator by electric control. When using the tuning element, no mechanical arrangement is required for moving the tuning element. Furthermore, the tuning element does not cause considerable dielectric losses nor intermodulation when being in a radiofrequency electromagnetic field, because the field cannot significantly penetrate through said conductive coating into the piezoelectric material. | 01-14-2010 |
20090058556 | ANTENNA END FILTER ARRANGEMENT - An arrangement for filtering the transmitting signals in a radio device using frequency division duplex. In a radio transmitter, in which the transmitting signal is divided to a plurality of antennas (ANT | 03-05-2009 |
20090045887 | DIRECTIONAL COUPLER - A directional coupler with two sensing conductors and a basic coupler and a supplementary coupler corresponding to them. The basic coupler is based on the coupling between a first sensing conductor ( | 02-19-2009 |
20090015502 | NEW ANTENNA STRUCTURE AND A METHOD FOR ITS MANUFACTURE - The antenna has an antenna element ( | 01-15-2009 |