Patent ID: 7457640

Claim:
A non-actively cooled radiofrequency device adapted for coupling to an antenna comprising: a housing having a plurality of cavities and an input and output, the input being coupled to the antenna, the output being coupled to a base station; a transmission path within the housing including a transmit filter; a receive path within the housing including at least one receive filter and a low noise amplifier, the receive filter including a plurality of cavities, wherein the cavity closest to an input of the receive filter comprises a metal resonator and the cavity closest to an output of the receive filter comprises a metal resonator, and the remainder of cavities in the receive filter each contain a dielectric-based resonator, wherein at least one pair of non-adjacent dielectric-based resonators are coupled via a metallic element; and wherein the radiofreguency device is configured for mounting on a tower within five feet of the antenna and wherein the at least one receive filter exhibits a passband moving less than 100 kHz over a temperature range from −20° C. to 60° C.