Publisher : Korean Institute of Navigation and Port Research
DOI : 10.5394/KINPR.2006.30.7.607
Title & Authors
Compact Low-Pass Filter with Sharp Skirt Characteristics and Broad Stopband Li, Rui; Kim, Dong-Il; Choi, Chang-Mook;
A new compact microstrip low-pass filter and its equivalent-circuit model are developed. The philosophy of the structure behind this novel microstrip low-pass filter is simple as it is composed of a pair of symmetrical parallel coupled-line and an open-stub. With this configuration, a finite attenuation pole near the stopband cutoff frequency is available and adjustable by simply tuning the circuit parameters. Furthermore, the rejection bandwidth of this type of low-pass filter can be extended. In order to validate the feasibility of the proposed design method, a low-pass filter based on a microstrip structure is designed, fabricated, and measured. Experimental results agree very well with the simulation and analytical results.
Mattaei, G. L., Young, L. and Jones, E. M. T.(1980), 'Microwave Filters, Impedance Matching Networks and Coupling Structures', New York: McGraw-Hill
Hong, J. S. and Lancaster, M. J.(2001), 'Microstrip Filters for RF/Microwave Applications', John Wiley & Son, Inc.
Sheen, J. W. (2000), 'A Compact Semi-Lumped Low-Pass Filter for Harmonics and Spurious Suppression', IEEE Microw. Guided Wave Lett., Vol. 10, pp. 92-93
Rumsey, I., May, M. and Kelly, P. K. (1998), 'Photonic Bandgap Structure used as Filters in Microstrip Circuits', IEEE Microw. Guided Wave Lett., Vol. 8, no. 10, pp. 336-338
Ahn, D., Park, J. S., Kim, C. S., Kim, J., Qian, Y. and Itoh, T. (2001), 'A Design of the Low-Pass Filter Using the Novel Microstrip Defected Ground Structure', IEEE Trans. Microw. Theory Tech., vol. 49, no. 1, pp. 86-93
Hsieh, L. H. and Chang, K.(2000), 'Compact Low-pass Filter Using Stepped Impedance Hairpin Resonator', Electron. Lett., vol. 37, no. 14, pp. 92-93
Hsieh, L. H. and Chang, K. (2003), 'Compact Elliptic- Function Low-pass Filters Using Microstrip Stepped-Impedance Hairpin Resonators', IEEE Microw. Theory Tech., vol. 51, no. 1, pp. 193-199
Gupta, K. C., Garg, R., Bahl, I. and Bhartia, P. (1996), 'Microstrip Lines and Slotlines', Artech House, Inc.
Yeung, L. K. and Wu, K. L.(2003), 'A Compact Second-Order LTCC Bandpass Filter with Two Finite Transmission Zeros', IEEE Trans. Microw. Theory Tech, vol. 51, no. 2, pp. 337-341