Metallic E-plane filter with cavities of different cutoff frequency

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Metallic E-plane filter with cavities of different cutoff frequency

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© The Institution of Electrical Engineers
Published

A planar integrated circuit filter with multiple all-metal inserts and multiple abrupt waveguide step-wall discontinuities is introduced which achieves broadband high attenuation in the second stopband. The design is based on field expansion into suitably normalised eigenmodes which yield directly the modal S-matrix. This theory allows the immediate inclusion of both the higher-order mode interaction at all discontinuities and the finite thickness of the inserts. Computer-optimised design data for a five-resonator Ka-band prototype filter at 27 GHz midband frequency provide a minimum stopband attenuation of 50 dB between 27.5 and 44.5 GHz.

Inspec keywords: microwave filters; waveguide components; cavity resonators

Other keywords: 27 GHz; five-resonator Ka-band prototype filter; broadband high attenuation; modal S-matrix; E-plane filter; eigenmodes; planar integrated circuit filter; cutoff frequency; abrupt waveguide step-wall discontinuities; minimum stopband attenuation; field expansion

Subjects: Waveguide and microwave transmission line components

References

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      • Y.C. Shih , T. Itoh . E-plane filters with finite thickness septa. IEEE Trans. , 1009 - 1013
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      • Y. Konishi , K. Uenakada . The design of a bandpass-filter with inductive strip—planar circuit mounted in waveguide. IEEE Trans. , 869 - 873
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      • Bornemann, J., Arndt, F.: `Waveguide ', Proc. of 15th European microwave conf., 1985, , p. 726–731.
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      • R. Vahldieck , J. Bornemann , F. Arndt , D. Grauerholz . Optimised waveguide E-plane metal insert filters for millimeter-wave applications. IEEE Trans. , 65 - 69
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      • F. Arndt , J. Bornemann , R. Vahldieck , D. Grauerholz . E-plane integrated circuit filters with improved stop-band attenuation. IEEE Trans. , 1391 - 1394
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