Title :
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
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;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2003. IEEE
Conference_Location :
Columbus, OH, USA
Print_ISBN :
0-7803-7846-6
DOI :
10.1109/APS.2003.1217567
