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Active and Passive Electronic Components
Volume 2008, Article ID 745368, 5 pages
Research Article

The Novel Microwave Stop-Band Filter

Institute of Radiophysics and Electronics, National Academy of Sciences of Ukraine, 12 Proskury Street, 61085 Kharkov, Ukraine

Received 30 November 2007; Revised 5 March 2008; Accepted 15 April 2008

Academic Editor: Tibor Berceli

Copyright © 2008 R. E. Chernobrovkin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The stop-band filter with the new band-rejection element is proposed. The element is a coaxial waveguide with the slot in the centre conductor. In the frame of this research, the numerical and experimental investigations of the amplitude-frequency characteristics of the filter are carried out. It is noted that according to the slot parameters the two typical resonances (half-wave and quarter-wave) can be excited. The rejection band of the single element is defined by the width, depth, and dielectric filling of the slot. Fifth-order Chebyshev filter utilizing the aforementioned element is also synthesized, manufactured, and tested. The measured and simulated results are in good agreement. The experimental filter prototype exhibits the rejection band 0.86 GHz at the level −40 dB.