I.A. Kolmakov - Ph.D. (Phys.-Math.), Senior Research Scientist, LTD «Special Technological Center» (St. Petersburg). E-mail: ikolmakov@gmail.com Y.A. Kolmakov - Engineer, LTD «Special Technological Center» (St. Petersburg). E-mail: y.kolmakov@gmail.com

Several ultra-wideband co-phase power dividers and quadrature directional couplers with operating frequencies from VHF up to X-band are considered in the paper. These devices are developed to use as a part of receivers and antenna-feeder systems. The possibilities of manufacturing such devices with high characteristics by using the multilayer printed circuit board technology are demonstrated. Quasi-lumped elements and microstrip transmission lines are used for design of the dividers. The co-phase power dividers are based on even mode coupled microstrip sections. The acceptable frequency responses of 2-way and 4-way dividers are achieved in the frequency band 300-3000 MHz (SWR<1,6). The quadrature directional couplers for VHF and UHF bands are based on a 5-order prototype net and designed by using the quasi-lumped elements. Two couplers with the frequency bands 30-140 MHz and 100-520 MHz are presented. They are manufactured as a four-layer PCB. For frequencies from L-band up to X-band the quadrature couplers are realized as a tandem connection. There are two versions of the coupler with frequency bands 4-9,5 GHz and 5,5-13 GHz, respectively. They are made in the form of a six-layer printed circuit board and represent a finished product for surface mounting.

 

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