Abstract: A tuneable resonator filter consisting of cavity resonators. In the partition wall separating the successive resonators on the transmission path of a resonator filter there is a coupling opening (CPO) with a typically constant width. The coupling strength between the resonators is adjusted by a tuning element which is supported to the partition wall on the opposite sides of the coupling opening so that it can be moved. The tuning element is conductive and grounded so that the impedance between its ends and the partition wall is low. For moving the tuning element, it is linked by a dielectric rod to an electrically controllable actuator being located on the filter lid. By means of the tuning mechanism the bandwidth of a filter can be set automatically.

Abstract: A tuneable resonator filter consisting of cavity resonators. In the partition wall separating the successive resonators on the transmission path of a resonator filter there is a coupling opening (CPO) with a typically constant width. The coupling strength between the resonators is adjusted by a tuning element which is supported to the partition wall on the opposite sides of the coupling opening so that it can be moved. The tuning element is conductive and grounded so that the impedance between its ends and the partition wall is low. For moving the tuning element, it is linked by a dielectric rod to an electrically controllable actuator being located on the filter lid. By means of the tuning mechanism the bandwidth of a filter can be set automatically.

Abstract: An integrated circuit for amplifying a signal and having an input that receives the signal and an output that outputs an amplified signal is provided. The integrated circuit has a first switch having at least two outputs. The first switch is coupled to the input of the integrated circuit and receives the signal from the input of the integrated circuit. In addition, the integrated circuit has a second switch having at least two inputs. The second switch is coupled to the output of the integrated circuit and transmits the amplified signal to the output of the integrated circuit. The integrated circuit has a first transistor that has a noise figure, an input coupled to one of the outputs of the first switch, and an output coupled to one of the inputs of the second switch. Moreover, the integrated circuit has a second transistor in parallel with the first transistor.

Abstract: An arrangement for measuring a condition of an antenna in a mobile telephone system has a radio equipment and a transmission line connecting the radio equipment to the antenna. The transmission line has opposite end sections, whereby one of the end sections of the transmission line is closer to the antenna than the other of the end sections of the transmission line. A masthead amplifier is at the one of the end sections of the transmission line, the masthead amplifier having first and second duplex filters, an RX branch, a TX branch and an amplifier element in the RX branch, wherein the RX branch, the TX branch and the amplifier element are between the duplex filters. The standing wave ratio is measured and a measuring value calculated therefrom within the one end section of the transmission line for measuring the condition of the antenna.

Abstract: The invention relates to a filter, a method for manufacturing a filter, a resonator construction, and a method for manufacturing a resonator construction. The filter comprises a shell construction and a plurality of resonators mounted in the shell construction for forming a multi-circuit filter. The filter comprises a connecting portion which combines the resonators and is integral with the resonators.