마이크로스트립 대역 저지 필터의 설계 = The Design of Microstrip Bandstop Filter

다국어 초록 (Multilingual Abstract)

In this paper, bandstop filters have been designed by microstrip line which relative permittivity(ε_r) 2.5, thickness(h) is 0.7874[㎜]. In procedure, filter have been designed with parallel stub which has been physically simply implemented, butterworth and chebyshev type have been used with commensurate line which length of all stubs at center frequency is λ/8. On designing, Richard transformation and Kuroda identities have been used. And characteristic impedance of each section calculated, in result width and length of each section calculated. The center frequency of the filter is 3[㎓] and bandwidth is 50%, and simulated with the values of width and length of each section. Also, measured values of filter compared with simulation results. In the case of butterworth, center frequency was shifted about 0.22[㎓], bandwidth was 1.82[㎓], in the case of chebyshev, center frequency was shifted 0.2[㎓], bandwidth was 1.58[㎓]. Frequency response the chebyshev type is more sharper than butterworth type, and theoretical values of the filters are agreed with the measured values.