FDTD analysis of periodically nonuniform coupled microstrip lines

Author

Jiunn-Nan Hwang ; Jen-Tsai Kuo

Author_Institution

Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan

Volume

1

fYear

2003

fDate

22-27 June 2003

Firstpage

741

Abstract

Periodic wave guiding structures have been widely used in microwave millimeter-wave circuits due to their slow-wave and frequency-selective characteristics. In a periodic structure, the dispersion relation is an important topic in designing the circuits. The FDTD method is used to analyze the propagation characteristics of periodically nonuniform coupled microstrip lines (PNCML). It is found that the propagation constant of the odd-mode is increased more significantly than that of the even-mode, when the dimensions of the stub are increased. The intersection of the dispersive even- and odd-mode propagation constants shows that the structure is useful in the design of high-performance directional couplers and bandpass filters.

Keywords

band-pass filters; finite difference time-domain analysis; microstrip directional couplers; microstrip filters; microstrip lines; microwave propagation; millimetre wave directional couplers; millimetre wave propagation; periodic structures; FDTD analysis; bandpass filters; directional couplers; dispersive propagation constants; even-mode; frequency-selective characteristics; microwave circuits; millimeter-wave circuits; odd-mode; periodic wave guiding structures; periodically nonuniform coupled microstrip lines; slow-wave characteristics; stub; Coupling circuits; Dispersion; Finite difference methods; Frequency; Microstrip; Microwave propagation; Millimeter wave circuits; Periodic structures; Propagation constant; Time domain analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium, 2003. IEEE

Conference_Location

Columbus, OH, USA

Print_ISBN

0-7803-7846-6

Type

conf

DOI

10.1109/APS.2003.1217567

Filename

1217567