B.M. Kats - Ph. D. (Eng.), Head of Department, NIKA-Microwave, Ltd (Saratov) E-mail: brs19520@yandex.ru A.V. Vorobiev - Engineer, NIKA-Microwave, Ltd (Saratov) E-mail: alexvorxx@mail.ru V.P. Meschanov - Dr. Sc. (Eng.), Honored Scientist of RF, Professor, Director of NIKA-Microwave, Ltd (Saratov) E-mail: nika373@bk.ru

Waveguide multiplexers are widely used in the space and terrestrial communication systems. The development of the multiplexers is difficult, because many technical requirements with tens parameters must be satisfied. One of the major problems of designing the waveguide multiplexers is the development of waveguide bandpass filters (BPF). In this work, the waveguide BPF with E plane metal inserts is studied. This filter type has the resonators direct coupled by E plane invertors (in-line E plane filter). It is possible to implement a unified design of BPF for the X band three-channel multiplexer. Three channel BPF is synthesized with the use of calculations and full-wave simulation. Each BPF has the same geometric dimensions of the inserts and waveguide resonators. Tuning of the central frequency of the BPF is performed by changing the penetration depth of the tuning screws only, and, the form of the amplitude frequency characteristic is saved. This design of the BPF may be used for the development of filters with tunable passband as well as for the development of the channel filters for multiplexers. The unification of the channel filters design allows one to simplify the development and manufacturing of the multiplexers and reduce their total cost.

 

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