Abstract: An arrangement for processing the antenna signal of a radio receiver and for leading it to low-noise amplifiers LNA of parallel amplifier branches. On the transmission path of the receiver from the antenna to the amplifiers LNA, functionally different elements are combined into physically united elements, such as the conductors (432, 433) of the low-passing part of the antenna filter and the division conductors of the Wilkinson divider (430), and the conductor (441) of the phase-shifter and the inductive part (L1) of the LNA matching circuit. Each physically united element is a conductor, which is insulated from the ground plane by air or a low-loss dielectric material. The arrangement reduces the number of lossy parts between the antenna and the amplifiers, and placing these parts on an ordinary circuit board is also avoided. For these reasons, inferior noise values compared to the prior art can be allowed for each LNA.

Abstract: A band stop filter comprises a transmission line with center and outer conductors, and coaxial resonators. The outer conductor forming a unitary conductive housing with an inner space divided by conductive partition walls into resonator cavities. Each of the resonator cavities contains at least one of the coaxial resonators, wherein each of the coaxial resonators separately has an electromagnetic coupling to the transmission line. The coupling arranged by a coupling element to form an attenuation peak in the a response curve of the filter, where the natural frequencies of the coaxial resonators differ from each other to shape the response curve of the filter. The transmission conductor is located inside the housing, running through openings in the partition walls across all the resonator cavities. The housing is the outer conductor of the transmission line, and a portion of the transmission conductor in a resonator cavity is the coupling element.

Abstract: An arrangement for dividing the output signal of the antenna filter of a radio receiver to two different paths, such as two parallel low-noise amplifier branches of a base station. The divider circuit is physically integrated into a resonator-type antenna filter (RXF). This takes place by placing some conductors (332, 333) of the divider inside some conductive part of the filter structure or the resonator cavity and by using the coupling conductor (331) of the output resonator as part of the input line of the divider at the same time. As the divider is used a Wilkinson divider. Due to the arrangement, a transmission line between the antenna filter and the divider becomes unnecessary, and the dielectric losses of the divider are reduced as compared to the prior art, in which case correspondingly inferior noise qualities can be allowed for low-noise amplifiers.

Abstract: A band stop filter (300) implemented by coaxial resonators for filtering antenna signals particularly in base stations of mobile communication networks. The starting point is a structure with a transmitting line and coaxial resonators electromagnetically coupled parallel with it, the natural frequencies of which resonators differ from each other slightly. The resonators (R1, R2, R3) form a unitary conductive resonator housing (310), the inner space of which has been divided into resonator cavities by conductive partition walls. In the invention, the center conductor (321) of the transmitting line is placed inside the resonator housing so that it runs across all the resonator cavities, and the housing functions as the outer conductor of the transmitting line at the same time. The resonator cavities are thus a part of the cavity of the transmitting line.

Abstract: An adjustable resonator filter (200), the operating band of which can be shifted by a one-time adjustment. The natural frequency of each resonator (210, 220) is affected, in addition to the basic tuning arrangement, by an adjustment circuit (ACI), which includes a fixed tuning element (280) in the resonator cavity and an adjusting part (290) outside the cavity. The tuning element has an electromagnetic coupling to the basic structure of the resonator. The adjustment circuit is functionally a short transmission line, which is “seen” by the resonator as a reactance of a certain value. By changing the electric length of the transmission line, the value of the reactance and the electric length and natural frequency of the whole resonator are changed. The change is implemented in the adjustment part by means of switches or a movable dielectric piece. In the resonator filter each resonator has a similar adjustment circuit, and the adjustment circuits have common control (CNT) for shifting the band of the filter.

Abstract: An arrangement for processing the antenna signal of a radio receiver and for leading it to low-noise amplifiers LNA of parallel amplifier branches. On the transmission path of the receiver from the antenna to the amplifiers LNA, functionally different elements are combined into physically united elements, such as the conductors (432, 433) of the low-passing part of the antenna filter and the division conductors of the Wilkinson divider (430), and the conductor (441) of the phase-shifter and the inductive part (L1) of the LNA matching circuit. Each physically united element is a conductor, which is insulated from the ground plane by air or a low-loss dielectric material. The arrangement reduces the number of lossy parts between the antenna and the amplifiers, and placing these parts on an ordinary circuit board is also avoided. For these reasons, inferior noise values compared to the prior art can be allowed for each LNA.

Abstract: The invention relates to a tunable resonator filter. In each resonator cavity of the filter there is a movable dielectric tuning element (728; 748) to adjust the resonator's natural frequency. The tuning elements are advantageously arranged to be moved by a common control implemented by a rod (708) joining them together, to shift the filter's band through equal displacements of the natural frequencies of the resonators. When the tuning element is moved horizontally sidewards from the resonator (710; 720; 730; 740; 750; 760) axis, the electrical length and natural frequency of the resonator change. In that case, when sub-bands are used it is not necessary to tune the filters separately for each sub-band in the stage of manufacture, as the sub-band can be chosen when the filter is put into use. The tuning elements can be movable also in each resonator separately, to implement the basic tuning in connection with the manufacture of the filter.

Abstract: An arrangement for dividing the output signal of the antenna filter of a radio receiver to two different paths, such as two parallel low-noise amplifier branches of a base station. The divider circuit is physically integrated into a resonator-type antenna filter (RXF). This takes place by placing some conductors (332, 333) of the divider inside some conductive part of the filter structure or the resonator cavity and by using the coupling conductor (331) of the output resonator as part of the input line of the divider at the same time. As the divider is used a Wilkinson divider. Due to the arrangement, a transmission line between the antenna filter and the divider becomes unnecessary, and the dielectric losses of the divider are reduced as compared to the prior art, in which case correspondingly inferior noise qualities can be allowed for low-noise amplifiers.

Abstract: The invention relates to a tunable resonator filter. In each resonator cavity of the filter there is a movable dielectric tuning element (728; 748) to adjust the resonator's natural frequency. The tuning elements are advantageously arranged to be moved by a common control implemented by a rod (708) joining them together, to shift the filter's band through equal displacements of the natural frequencies of the resonators. When the tuning element is moved horizontally sidewards from the resonator (710; 720; 730; 740; 750; 760) axis, the electrical length and natural frequency of the resonator change. In that case, when sub-bands are used it is not necessary to tune the filters separately for each sub-band in the stage of manufacture, as the sub-band can be chosen when the filter is put into use. The tuning elements can be movable also in each resonator separately, to implement the basic tuning in connection with the manufacture of the filter.

Abstract: The invention relates to a tunable resonator filter. In each resonator cavity of the filter there is a movable dielectric tuning element (728; 748) to adjust the resonator's natural frequency. The tuning elements are advantageously arranged to be moved by a common control implemented by a rod (708) joining them together, to shift the filter's band through equal displacements of the natural frequencies of the resonators. When the tuning element is moved horizontally sidewards from the resonator (710; 720; 730; 740; 750; 760) axis, the electrical length and natural frequency of the resonator change. In that case, when sub-bands are used it is not necessary to tune the filters separately for each sub-band in the stage of manufacture, as the sub-band can be chosen when the filter is put into use. The tuning elements can be movable also in each resonator separately, to implement the basic tuning in connection with the manufacture of the filter.

Abstract: An adjustable resonator filter (200), the operating band of which can be shifted by a one-time adjustment. The natural frequency of each resonator (210, 220) is affected, in addition to the basic tuning arrangement, by an adjustment circuit (ACI), which includes a fixed tuning element (280) in the resonator cavity and an adjusting part (290) outside the cavity. The tuning element has an electromagnetic coupling to the basic structure of the resonator. The adjustment circuit is functionally a short transmission line, which is “seen” by the resonator as a reactance of a certain value. By changing the electric length of the transmission line, the value of the reactance and the electric length and natural frequency of the whole resonator are changed. The change is implemented in the adjustment part by means of switches or a movable dielectric piece. In the resonator filter each resonator has a similar adjustment circuit, and the adjustment circuits have common control (CNT) for shifting the band of the filter.

Abstract: The invention relates to a tunable resonator filter. In each resonator cavity of the filter there is a movable dielectric tuning element (728; 748) to adjust the resonator's natural frequency. The tuning elements are advantageously arranged to be moved by a common control implemented by a rod (708) joining them together, to shift the filter's band through equal displacements of the natural frequencies of the resonators. When the tuning element is moved horizontally sidewards from the resonator (710; 720; 730; 740; 750; 760) axis, the electrical length and natural frequency of the resonator change. In that case, when sub-bands are used it is not necessary to tune the filters separately for each sub-band in the stage of manufacture, as the sub-band can be chosen when the filter is put into use. The tuning elements can be movable also in each resonator separately, to implement the basic tuning in connection with the manufacture of the filter.