Abstract: A coupling is provided for coupling non-adjacent resonators of a radio frequency filter. The coupling joins together non-adjacent resonators with a metal strip. The metal strip is physically connected to but electrically isolated from resonators located between the connected non-adjacent resonators. The metal strips include tabs the length of which may be varied. The coupling works with different resonator configurations including horizontally aligned resonators. The coupling allows for the jumping of an even number of resonators can produce zeros at high and low bands. A single coupling of this configuration enables two negative couplings.

Abstract: A coupling is provided for coupling non-adjacent resonators of a radio frequency filter. The coupling joins together non-adjacent resonators with a metal strip. The metal strip is physically connected to but electrically isolated from resonators located between the connected non-adjacent resonators. The metal strips include tabs the length of which may be varied. The coupling works with different resonator configurations including horizontally aligned resonators. The coupling allows for the jumping of an even number of resonators can produce zeros at high and low bands. A single coupling of this configuration enables two negative couplings.

Abstract: The present disclosure relates to microwave cavity filters used in cellular communication systems. More specifically, in one aspect, the present disclosure relates to the integration of combline cavity filters directly with antenna elements without galvanic connections. In another aspect, the present disclosure relates methods for loading combline filters without contact.

Abstract: A modular high power, low passive intermodulation, active, universal, distributed antenna system interface tray that includes one or more front-end RF frequency duplexers instead of a high power, low passive intermodulation attenuator to achieve superior FIM performance. A cable switch matrix allows for the use of the system among varying power levels* and accomplishes the above in a modular architecture.

Abstract: The present disclosure relates to microwave cavity filters used in cellular communication systems. More specifically, in one aspect, the present disclosure relates to the integration of combline cavity filters directly with antenna elements without galvanic connections. In another aspect, the present disclosure relates methods for loading combline filters without contact.

Abstract: A modular high power, low passive intermodulation, active, universal, distributed antenna system interface tray that includes one or more front-end RF frequency duplexers instead of a high power, low passive intermodulation attenuator to achieve superior FIM performance. A cable switch matrix allows for the use of the system among varying power levels and accomplishes the above in a modular architecture.

Abstract: An improved microwave cavity filter used in cellular communication systems such as base stations is disclosed. The cavity filter has a conductive housing forming a cavity therein and a hollow conductive resonator configured in the cavity with a folded hat shaped upper portion. A tuning screw extends from the top cover of the housing into the top folded hat portion of the hollow resonator to fine tune the resonator. The resonator also may preferably include two different diameter sections providing a first high impedance section with smaller diameter and a second lower impedance section with a larger diameter configured at an upper end of the resonator. This configuration provides a significantly smaller cavity height for a given power handling capability. The resonator is preferably of constant thickness allowing low cost stamping or other forming techniques to be used in forming the resonator.

Abstract: An improved microwave cavity filter used in cellular communication systems such as base stations is disclosed. The cavity filter has a conductive housing forming a cavity therein and a hollow conductive resonator configured in the cavity with a folded hat shaped upper portion. A tuning screw extends from the top cover of the housing into the top folded hat portion of the hollow resonator to fine tune the resonator. The resonator also may preferably include two different diameter sections providing a first high impedance section with smaller diameter and a second lower impedance section with a larger diameter configured at an upper end of the resonator. This configuration provides a significantly smaller cavity height for a given power handling capability. The resonator is preferably of constant thickness allowing low cost stamping or other forming techniques to be used in forming the resonator.

Abstract: The present disclosure relates to microwave cavity filters used in cellular communication systems. More specifically, in one aspect, the present disclosure relates to the integration of combline cavity filters directly with antenna elements without galvanic connections. In another aspect, the present disclosure relates methods for loading combline filters without contact.

Abstract: A coupling loop with each leg connected by two resistors, R1 and R2 going to ground on a disk shaped printed circuit board provides a directional coupler with directivity tuned by rotating this disk assembly and coupling controlled by the distance to the main RF transmission line. Once the desired level of directivity is obtained, this board is locked with screws from the top.

Abstract: An improved microwave cavity filter used in cellular communication systems such as base stations is disclosed. The cavity filter has a conductive housing forming a cavity therein and a hollow conductive resonator configured in the cavity with a folded hat shaped upper portion. A tuning screw extends from the top cover of the housing into the top folded hat portion of the hollow resonator to fine tune the resonator. The resonator also may preferably include two different diameter sections providing a first high impedance section with smaller diameter and a second lower impedance section with a larger diameter configured at an upper end of the resonator. This configuration provides a significantly smaller cavity height for a given power handling capability. The resonator is preferably of constant thickness allowing low cost stamping or other forming techniques to be used in forming the resonator.

Abstract: A coupling loop with each leg connected by two resistors, R1 and R2 going to ground on a disk shaped printed circuit board provides a directional coupler with directivity tuned by rotating this disk assembly and coupling controlled by the distance to the main RF transmission line. Once the desired level of directivity is obtained, this board is locked with screws from the top.