Tunable lumped-element bandpass filters with constant bandwidth
Abstract
Lumped-element bandpass filters using LC-tanks and immittance inverters are considered. Tuning of the central frequency is provided by using variable capacitors of LC-tanks and immittance inverters. Tunability of constant-bandwidth bandpass filters is analyzed. Conditions to keep absolute and fractional bandwidth constant are presented. Tunability limitations due to to practical implementation of the immittance inverters and using of real controlling com.ponents (variable capacitors) are discussed. Design of a 3-pole tunable bandpass filter with constant absolute bandwidth is presented.
About the Authors
A. E. Baskakova
Saint-Petersburg state electrotechnical university "LETI"
Russian Federation
Russian Federation
V. M. Turgaliev
Saint-Petersburg state electrotechnical university "LETI"
Russian Federation
Russian Federation
D. V. Kholodnyak
Saint-Petersburg state electrotechnical university "LETI"
Russian Federation
Russian Federation
References
1. Hunter I. C., Rhodes J. D. Electronically tunable microwave bandpass filters // IEEE Trans. microwave theory tech. 1982. Vol. MTT-30, № 9. P. 1354-1360.
2. Design of tunable ferroelectric filters with a constant fractional band width / I. Vendik, O. Vendik, V. Pleskachev et al. // IEEE MTT-S Int. microwave symp. dig. Phoenix, 20-24 May 2001. Piscataway: IEEE, 2001. Vol. 3. P. 1461-1464.
3. Ultra-selective constant-bandwidth electromechanically tunable HTS filters / G. Tsuzuki, M. Hernandez, E.M. Prophet et al. // IEEE MTT-S Int. microwave symp. dig. San Francisco, 11-16 June 2006. Piscataway: IEEE, 2006, P. 693-696.
4. Yu F. L., Zhang X.Y., Zhang Y. B. Frequency-tunable bandpass filters with constant absolute bandwidth and improved linearity // Progress in electromagnetics research lett. 2012. Vol. 33. P. 131-140.
5. Matthaei G. L., Young L., Jones E. M. T. Microwave filters, impedance-matching networks, and coupling stru.cture. Dedham, MA: Artech House. 1980. 439 p.
6. Hong J.-S., Lancaster Hong M. J. Microstrip filters for RF-microwave applications. NewYork: John Wiley & Sons, 2001. 457 p.
Review
For citations:
Baskakova A.E., Turgaliev V.M., Kholodnyak D.V. Tunable lumped-element bandpass filters with constant bandwidth. Journal of the Russian Universities. Radioelectronics. 2015;(4):36-43. (In Russ.)
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