Patent ID: 7342469

Claim:
An air cavity module for a planar filter operating in millimeter-wave frequency bands, comprising: a filter operating in the millimeter frequency bands, wherein the filter has a first filter end for receiving or outputting an electrical signal; an air cavity having entirely open side and top surfaces to mount the filter therein; and an air cavity cover, having an open ended first cover rectangular recess, closing up the top surface of the air cavity except the area exposed due to the open ended first cover recess to allow the transmission of signals from and into the filter, wherein the open ended first cover rectangular recess is located at an edge of the air cavity cover to expose a portion of the first filter end through the top surface of the air cavity, wherein the open ended first cover rectangular recess has a depth dp and an width wp, and wherein the open ended first cover rectangular recess allows insertion of a measurement probe or a wire for wire bonding into the air cavity, and the depth dp is not more than ¼ of the wavelength of the electrical signal, said electrical signal guided by the air cavity module.