Small-sized microstrip delay line filters on the substrates with high permittivity

Alexander V. Zakharov; Ludmila S. Pinchuk

doi:10.3103/S0735272711100062

Authors

Alexander V. Zakharov Igor Sikorsky Kyiv Polytechnic Institute, Ukraine https://orcid.org/0000-0002-1222-1623
Ludmila S. Pinchuk Igor Sikorsky Kyiv Polytechnic Institute, Ukraine https://orcid.org/0000-0002-1893-3365

DOI:

https://doi.org/10.3103/S0735272711100062

Keywords:

microstrip delay line filter, bandpass, phase deviation, coupling coefficient

Abstract

There are considered small-sized microstrip delay line filters on the substrates with permittivity (ε_r = 92, 36), whose metallic screen is placed at the height, equal to substrate thickness. Filters contain three step resonators, which are placed close to each other with a gap of 0.1–0.2 mm. The basis of delay line filters construction lies in specificities of electromagnetic interaction of closely placed step resonators with closely placed screen and possibility of modification of coupling between non-adjacent resonators. There are represented data of measurement and simulation. Dimensions of a filter on a substrate with ε_r = 92, was 5×5×2 mm, they are comparable with dimensions of small-sized microwave ceramic filters of one-piece construction, used in portable communication devices. It is shown that a set of technical characteristics makes new delay line filters competitive.

References

J.-S. Hong and M. J. Lancaster, Microstrip Filters for RF/Microwave Application (John Wiley & Sons Inc., New York, 2001).

P. W. Wong and I. Hunter, “Electronically Tunable Filters,” IEEE Microwave Magazine 10, No. 6, 46 (2009).

Z. C. Hao and J. S. Jia-Sheng Hong, “Ultrawideband Filter Technologies,” IEEE Microwave Magazine 11, No. 4, 56 (2010).

G. Zhang, M. J. Lancaster, and F. Huang, “A High-Temperature Superconducting Bandpass Filter with Microstrip Quarter-Wavelength Spiral Resonators,” IEEE Trans. Microwave Theory Tech. 54, No. 2, 559 (2006).

http://www.klmicrowave.com.

http://www.merrimacind.com.

T. Ishizaki, T. Uwano, H. Kagata, H. Miyake, and M. Fujita, “A small laminated planar filter for use in compact portable telephones,” Microwave Journal, No. 10, 106 (1995).

S. I. Bakharev, V. I. Volman, Yu. N. Lib, et al., Handbook for Caclulation and Design off Microwave Strip Devices (Radio i Svyaz’, Moscow, 1982) [in Russian, ed. by V. I. Volman].

A. L. Feldshtein (ed.), Handbook of Strip Devices Technology (Svyaz’, Moscow, 1979) [in Russian].

http://www.murata.com.

http://www.epcos.com.

A. F. Sheta, J. P. Coupez, G. Tanne, S. Toutain, and J. P. Blot, “Miniature Microstrip Stepped Impedance Resonator Bandpass Filters and Diplexers for Mobile Communications,” IEEE MTT-S Int. Microwave Symp. Dig. 2, 607 (1996).