Capacitive Iris Bandpass Filters with Spurious Harmonic Modes Suppression
AKADEMIYA NAUK USSR KHARKOV INST OF RADIOPHYSICS AND ELECTRONICS
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A new design of capacitively coupled bandpass filter, that provides suppression of spurious passbands for the dominant and the second waveguide modes without any extension of the filter dimensions, keeping the same return loss within the passband, is presented. Spurious passbands suppression is provided by cutting in iris strips additional pair of slots. Cutting the additional slots leads to the appearance of attenuation poles, which are placed in the spurious passbands. The k-inverter of corresponding two-side double-slot iris changes slightly and may be easily fine-tuned. Numerical examples are presented for the three-section 5 filter in wr90 waveguide.
- Electrical and Electronic Equipment
- Electricity and Magnetism
- Radiofrequency Wave Propagation