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Microstrip filters resonators with high frequency selectivity employing co-directional hairpin resonators

Keywords:

G.M. Aristarkhov – Dr. Sc. (Eng.), Professor, Head of Department of Moscow University of Communication and Information. E mail: g.aristarkhov2010@yandex.ru
N.V. Zvezdinov – Post-graduate Student, Moscow University of Communication and Information. E-mail: nikitazvezdinov@mail.ru
V.P. Chernyshev – Ph.D. (Eng.), Head of Department of JSC Vympelcom. E-mail: vpchern@mail.ru


The article examines the structure of compact microstrip filters based on co-directional (collinear) hairpin resonators. Basic element of microstrip filters employing co-directional hairpin resonators is irregular quarter wavelength lattice section of two coupled lines formed by adjacent resonators. The main purpose of this work is to investigate the possibility of a significant increase in the selectivity of the microstrip filter based on co-directional hairpin resonators by organizing additional electromagnetic coupling of a certain type as between adjacent lattice sections as well as nonadjacent resonators.
References:

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  2. Rhodes J. D. Theory of Electrical Filters. London: Wiley, 1977.
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  4. Lancaster J. M., Hong J.-S. Cross coupled microstrip Hairpin-resonator filters // IEEE Trans. MTT. 1998. Vol. 46. No. 1. P.118-122.
  5. Aristarkhov G.M., Chernyshev V.P. “Microstrip filter”, Inventor's certificate of the USSR 1058012.  August 1, 1983. Bul. 44. (in Russian)
  6. Aristarkhov G.M., Chernyshev V.P. Indirect synthesis of microstrip filters employing codirectional comb resonators // Soviet journal of communications technology & electronics. Vol. 32. October 1987. P. 34-40.
  7. Aristarkhov G.M., Gerasimenko A.P., Mikhnevich P.S., Chernyshev V.P. High selectivity microwave microstrip filters for communication equipment // Electrosvyaz’. 1991. No. 1. P. 38-41. (in Russian)
  8. Aristarkhov G.M., Mikhnevich P.S., Chernyshev V.P. “Microstrip filter”, Inventor's certificate of the USSR 1262607. June 8, 1986.
  9. Matthaei G. L., Fenzi N. O., Forse R. J., Rohlfing S. M. Hairpin–comb filters for HTS and other narrow-band applications // IEEE Trans. MTT. 1997. Vol. 45. P. 1226–1231.
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  11. Aristarkhov G.M., Chernyshev V.P. “Equivalent mode representation of microstrip filters using multiconductor lines with unequal phase velocities // Soviet journal of communications technology & electronics. Vol. 31. April, 1986. P. 1-7.

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