A New Class of Dual-Band Waveguide Filters Based on Chebyshev Polynomials of the Second Kind
| Autor: | Peng Wen Wong, Socheatra Soeung, Yuhao Leong, Sovuthy Cheab |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Chebyshev polynomials
Waveguide filter Narrowband General Computer Science 020208 electrical & electronic engineering Bandwidth (signal processing) Ripple General Engineering second kind Chebyshev 020206 networking & telecommunications 02 engineering and technology waveguide Topology Chebyshev filter transmission zeros 0202 electrical engineering electronic engineering information engineering Return loss symmetrical dual-bandpass filters General Materials Science lcsh:Electrical engineering. Electronics. Nuclear engineering Passband lcsh:TK1-9971 Mathematics |
| Zdroj: | IEEE Access, Vol 8, Pp 28571-28583 (2020) |
| ISSN: | 2169-3536 |
| Popis: | This paper presents for the first time a method of mathematical synthesis involving chaining of Chebyshev polynomials of the second kind for the application of a dual-band waveguide filter. This method takes advantage of second kind Chebyshev polynomials that have high out-of-band rejection, and overcomes unequal-ripple properties. It is applicable to high filter orders greater than five, and will always possess symmetrical dual-band filter properties. This proposed approach is able to achieve an optimum and constant ripple, the flexibility of return loss, and high adjacent band’s rejection. The design method is based on suitably defined transmission zeros at the centred frequency to the chained Chebyshev of the second kind. A sixth-order waveguide filter based on a prescribed return loss of 15 dB centred at a frequency of 28 GHz, with a fractional bandwidth of 1% in each passband, has been implemented and fabricated. The measured results show that the return loss, total bandwidth, and the frequency shift are 12 dB, 860 MHz, and 0.24%, respectively. The measured and ideal responses of the waveguide model are in a good agreement. |
| Databáze: | OpenAIRE |
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