Computer-aided design of inductively coupled rectangular waveguide filters including tuning elements

Automated design of complex waveguide filters for space systems: A case study

“…To test the performance of the design procedure with more complex structures, two tunable H-plane coupled cavity filters have been considered. These filters were originally designed and manufactured as proposed in [9], where the design was performed manually. These same filters have been redesigned with the CAD tool just proposed before.…”

“…3). As proposed in [9], the use of these tuning posts allows the use of a common base struc- ture for obtaining filters at different frequency bands. The only difference in the filters at each frequency band is the penetration of the tuning posts.…”

Wideband generalized admittance matrix representation for the analysis and design of waveguide filters with coaxial excitation

“…[3] In addition, most of the aforementioned types of filters usually include rectangular waveguide sections with partialheight metallic posts, and this key building block is also found in many other waveguide devices, such as adapters, modelaunchers, comb-line, and interdigital filters [Ihmels and Arndt, 1993;Levy et al, 1997]. Furthermore, this basic building block also allows to model real tuning screws, which are widely employed in practical implementations of dual-mode and direct-coupled rectangular waveguide filters [Chang and Zaki, 1991;Boria et al, 1998]. The usual presence of these practical filters in most of present communication systems (e.g., mobile and satellite ones) demands the availability of fast CAD tools, while preserving a high degree of accuracy.…”