Abstract
This paper describes an analytic design procedure for microstrip tunable filters. Step-impedance resonators are employed and loaded with varactors for achieving agility in the filter response. Fixed lumped capacitors are utilized as admittance inverters in order to minimize the number of varactors in the filter. An analytic approach for filter design makes it possible to achieve a tunable filter showing the same frequency response when the center frequency is adjusted. A two-pole microstrip tunable filter whose center frequency can be adjusted from 1.1 to 1.5 GHz is designed to demonstrate the validity of design theory. A prototype tunable filter operating from 2.1 to 2.7 GHz is also designed and measured. A good agreement between the measured and simulated results is shown. Finally, three- and four-pole tunable filters are designed to show straightforward application of the presented design method to higher order tunable filter design.
| Original language | English |
|---|---|
| Article number | 4545889 |
| Pages (from-to) | 1699-1706 |
| Number of pages | 8 |
| Journal | IEEE Transactions on Microwave Theory and Techniques |
| Volume | 56 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 2008 Jul 1 |
| Externally published | Yes |
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Keywords
- Microwave filters
- Tunable filters
- Varactor
ASJC Scopus subject areas
- Electrical and Electronic Engineering
Cite this
An analytic design method for microstrip tunable filters. / Lee, Ju Seop; Sarabandi, Kamal.
In: IEEE Transactions on Microwave Theory and Techniques, Vol. 56, No. 7, 4545889, 01.07.2008, p. 1699-1706.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - An analytic design method for microstrip tunable filters
AU - Lee, Ju Seop
AU - Sarabandi, Kamal
PY - 2008/7/1
Y1 - 2008/7/1
N2 - This paper describes an analytic design procedure for microstrip tunable filters. Step-impedance resonators are employed and loaded with varactors for achieving agility in the filter response. Fixed lumped capacitors are utilized as admittance inverters in order to minimize the number of varactors in the filter. An analytic approach for filter design makes it possible to achieve a tunable filter showing the same frequency response when the center frequency is adjusted. A two-pole microstrip tunable filter whose center frequency can be adjusted from 1.1 to 1.5 GHz is designed to demonstrate the validity of design theory. A prototype tunable filter operating from 2.1 to 2.7 GHz is also designed and measured. A good agreement between the measured and simulated results is shown. Finally, three- and four-pole tunable filters are designed to show straightforward application of the presented design method to higher order tunable filter design.
AB - This paper describes an analytic design procedure for microstrip tunable filters. Step-impedance resonators are employed and loaded with varactors for achieving agility in the filter response. Fixed lumped capacitors are utilized as admittance inverters in order to minimize the number of varactors in the filter. An analytic approach for filter design makes it possible to achieve a tunable filter showing the same frequency response when the center frequency is adjusted. A two-pole microstrip tunable filter whose center frequency can be adjusted from 1.1 to 1.5 GHz is designed to demonstrate the validity of design theory. A prototype tunable filter operating from 2.1 to 2.7 GHz is also designed and measured. A good agreement between the measured and simulated results is shown. Finally, three- and four-pole tunable filters are designed to show straightforward application of the presented design method to higher order tunable filter design.
KW - Microwave filters
KW - Tunable filters
KW - Varactor
UR - http://www.scopus.com/inward/record.url?scp=47649095508&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=47649095508&partnerID=8YFLogxK
U2 - 10.1109/TMTT.2008.925569
DO - 10.1109/TMTT.2008.925569
M3 - Article
AN - SCOPUS:47649095508
VL - 56
SP - 1699
EP - 1706
JO - IEEE Transactions on Microwave Theory and Techniques
JF - IEEE Transactions on Microwave Theory and Techniques
SN - 0018-9480
IS - 7
M1 - 4545889
ER -