High electrical strength and low losses compared to other transmission lines
predetermined the widespread use of waveguide filters and multiplexers in on-board radioelectronic complexes of satellite communication systems. The electrical parameters of these
devices, taking into account the specifics of their operation in near-Earth orbit, are subject to
fairly stringent requirements: high power limit, temperature stability, weight, and size
indicators. Their disadvantages can be considered as a limited range of operating frequencies,
determined by the cutoff frequencies of the main and first higher modes, as well as relatively
large sizes. Very high requirements are also placed on the accuracy of the manufacture of
filtration devices. At present, in the literature, one can find a description of a large number of
various designs of band-pass filters of the waveguide type. Some of them are considered in the
present chapter.
Keywords: Band-pass, Central frequency, Dual-band filters, Helical resonator, In-line topology, Microwave range, Power-handling capability, Q-factor, Space communication systems, Waveguide filter.
