Stephen C. Holme

Satellite L-band output multiplexer utilizing single and dual mode dielectric resonators

A four-channel, contiguous-band output multiplexer for L-band satellite applications is described. The filters feature single- and dual-mode dielectric resonators and operate at power levels up to 13 W in vacuum. The design of the multiplexer was optimized to meet different requirements for each of the filters. Excellent electrical performance in a relatively small package was obtained by use of high-performance dielectric resonators and a coaxial line combiner.<<ETX>>

A 12 GHz 12 Channel Contiguous Multiplexer for Satellite Applications

A 12 GHz 12 channel contiguous multiplexer realization for satellite applications is presented. Utilization of extensive computer modeling and optimization resulted in excellent performance of the multiplexer. The selected configuration employs an H-plane T-junction manifold.

A Ka-band dual mode dielectric resonator loaded cavity filter for satellite applications

A high performance, Ka-Band, dielectrically loaded dual mode cavity filter has been developed. It utilizes higher order HE12δ modes to achieve high Q factors, wide tuning range, and a large range of bandwidths. Similarity of the design with a more conventional HE11δ design results in high commonality of parts with Ku-band designs and thus lower cost.

A compact seven-way power divider for satellite beam forming networks

Two designs for a seven-way power divider/combiner are described that meet the physical and performance requirements needed to implement a beamforming network for a communication satellite. The key to the successful implementation of this scheme is the ability to form the basic seven-way divider used in a very compact form. Approximately half of the input power must be delivered to an output port that has an axis parallel to that of the input port, with the remaining power divided equally among six radial ports. One uses six pairs of quarter-wavelength-long broadside coupled lines. The second configuration uses three sections of power division: a single Wilkinson two-way divider provides the power split to the output port, and, a three-way radial divider, capable of theoretically infinite isolation, feeds three separate Wilkinson two-way dividers, which then provide the six radial outputs. Both designs have been analyzed, built, and tested, and the experimental results are described.<<ETX>>