Hollow waveguide filters (H01P1/212, H01P1/213, H01P1/215, H01P1/219 take precedence)

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Auxiliary devices (coupling devices of the waveguide type H01P5/00) > Frequency-selective devices, e.g. filters > Hollow waveguide filters (H01P1/212, H01P1/213, H01P1/215, H01P1/219 take precedence)

Child Classifications

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• H01P 1/208 Cascaded cavities; Cascaded resonators inside a hollow waveguide structure (H01P1/205 takes precedence)
• H01P 1/209 comprising one or more branching arms or cavities wholly outside the main waveguide
• H01P 1/211 Waffle-iron filters; Corrugated structures