Other

Cambridge Industries, Inc.

Andrew Patrick Baird

Gerard King

Stephen John Flynn

A low nosie block (LNB) system is described which facilitates the mount of printed circuit board (PCBs) with probes attached to an LNB housing. The LNB housing has, in a preferred arrangement, two keyhole-shaped apertures located in the back wall of the waveguide for receiving the probes already mounted to the PCB. The apertures are dimensioned and proportioned to lie on either side of a waveguide septum and to allow probes, when coupled to a printed circuit board, to be inserted through the respective apertures for correct orientation within the waveguide once the printed circuit board is secured to the housing and to allow minimal transmission of electromagnetic radiation through the apertures other than by a transmission line formed by the probes.

Low noise block PCB mounting system using non-linear insertable probes

An RF waveguide signal transition apparatus for minimizing leakage at RF frequency is described which consists of providing a plurality of plated through-holes (,) of blind holes in a circuit board (,). The plated holes (,) are disposed on the circumference of a circle around the RF waveguide to microstrip transition of probe (,) and each of the plated holes (,) is connected to a ground plane (,). The size of distribution of the plated holes provides a barrier to signal leakage at RF frequencies in the range 10.95-11.7 GHz and they also provide a transition impedance similar to the 50 ohm characteristic impedance providing satisfactory matching and minimizing leakage into the board. The apparatus can also be used to minimise leakage from microstrip to microstrip transitions passing through the circuit board.

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Ayrshire, United Kingdom

Andrew Patrick Baird