Peculiarities of characteristics for the second-order bandpass filters formed by half-wave and quarter-wave microstrip resonators
A comparison is done for the characteristics of bandpass filters consisting of two interacting resonators, which are either half-wave or quarter-wave segments of microstrip transmission lines with the same widths of strip conductors. 0.5 mm-thickness plates made of high-frequency ceramic TBNS were used as substrates for the microstrip structures. The structures having a maximum coupling region of the resonators and a maximum value of their coupling to external ports with wave impedance 50 W were under study. The filters were tuned by choosing the gap between the strip conductors so that the maximum reflection level in the passband was equal to -20 dB. Numerical electromagnetic simulation of 3-D models showed that the fractional bandwidth of the filters based on quarter-wave resonators is almost twice the bandwidth of filters based on half-wave resonators, and this fact was confirmed by the measurement results. The discovered effect is explained by twice characteristic impedance of a quarter-wave resonator relative to a half-wave one.
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Keywords
microstrip resonator, coupling coefficient, equivalent circuit, bandpass filter, dielectric substrateAuthors
| Name | Organization | |
| Belyaev B.A. | Siberian State University of Science and Technology; Siberian Federal University; Kirensky Institute of Physics, Federal Research Center KSC SB RAS | belyaev@iph.krasn.ru |
| Balva Ya.F. | Kirensky Institute of Physics, Federal Research Center KSC SB RAS | ya.f.balva@iph.krasn.ru |
| Leksikov An.A. | Kirensky Institute of Physics, Federal Research Center KSC SB RAS | a.a.leksikov@gmail.com |
| Serzhantov A.M. | Siberian State University of Science and Technology; Siberian Federal University | cubicus@mail.ru |
| Khodenkov S.A. | Siberian State University of Science and Technology | hsa1982sibsau@mail.ru |
| Shumilov T.Yu. | Siberian Federal University; Kirensky Institute of Physics, Federal Research Center KSC SB RAS | shumilovty@gmail.com |
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