Abstract: A tuneable filter comprising at least one resonator body comprising a resonant cavity defined by an electrically conducting cavity wall, the cavity wall comprising a grounding face, a capacitive face and a surrounding wall extending therebetween; a resonator within the cavity; and, a detuning arm arranged within the cavity substantially parallel to the capacitive face, the detuning arm being adapted to rotate in a plane substantially parallel to the capacitive face about a detuning axis.

Abstract: An electrical filter for filtering an electrical signal, the filter having a transmission characteristic comprising a band edge at a band edge transition frequency, the filter comprising a circulator having a first circulator port for receiving a signal to be filtered, the circulator being adapted to transfer a signal received at the first circulator port to a second circulator port and being further adapted to transfer a signal received at the second circulator port to a third circulator port; and, a reflection mode filter connected to the second port; the reflection mode filter comprising a filter network comprising at least one resonator, the filter network having a network input connected to the second circulator port; and, a further resonator connected to the network input, the further resonator being arranged to provide an extracted pole providing a transmission zero closest to the band edge transition frequency; wherein the further resonator has a high Q compared to the low Q of at least one of the at

Abstract: A filter block comprising a hybrid filter, the hybrid filter comprising a first signal splitter having a first input port and a first output port; a second signal splitter having a first input port and a first output port; each of the first and second splitters having first and second connection ports; the two first connection ports being connected together by a first signal path comprising a first filter; the second two connection ports being connected together by a second signal path comprising a second filter; the first and second signal paths each further comprising a transformer connected between the filter and one of the first and second signal splitters.

Abstract: A microwave TM mode resonator includes a resonator cavity defined by an electrically conducting cavity wall having first and second spaced apart end faces and a side wall extending therebetween. The resonator further includes a resonator body within the cavity extending along its length between the first and second end faces, wherein a portion of the length of the resonator body is a dielectric and a further portion of the length is a metal.

Abstract: A microwave transmission assembly comprising a combiner comprising first and second input ports and internal and external output a ports; the combiner being adapted to transfer a signal received at microwave frequency f1 at the first input port to the external output port and signals received at other frequencies to the internal output port; the combiner being further adapted to transfer a signal at a microwave frequency f2 at the second input port to the external output port and signals received at the other frequencies to the internal output port; a resistive load connected to the internal output port; and, a power dependent reflective load connected in series with the resistive load, the power dependent reflective load comprising a reactive element, the reactive element comprising an inductive component and a capacitive component and being adapted to resonate at a load frequency; the impedance of the capacitive component being adapted to drop when the incident microwave power received by the power dependen

Abstract: A filter block comprising a hybrid filter, the hybrid filter comprising a first signal splitter having a first input port and a first output port; a second signal splitter having a first input port and a first output port; each of the first and second splitters having first and second connection ports; the two first connection ports being connected together by a first signal path comprising a first filter; the second two connection ports being connected together by a second signal path comprising a second filter; the first and second signal paths each further comprising a transformer connected between the filter and one of the first and second signal splitters.