Reflection-type bandpass filter
A band-pass filter and reflective technology, which is applied in the field of ultra-wideband, can solve the problems of narrow pass band, difficult implementation, and complex design method of band-pass filter, and achieve the effect of large stop band suppression and small change of group delay
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Embodiment 1
[0131] A Kaiser window in which A=30 was used, where the reflectance in the frequency f range of 3.4GHz≦f≦10.3GHz was set to 1, and the reflectance in other regions was set to 0. In addition, the length of one wavelength at a frequency f = 1 GHz of the signal transmitted in the microstrip line was defined as the waveguide length, and the characteristic impedance of the system was set to 50Ω, and the design was performed. Here, the characteristic impedance must be designed to match the impedance of the system used. Generally, in circuits that handle high-frequency signals, 50Ω, 75Ω, or 300Ω, etc. are used as the impedance of the system. Preferably, the characteristic impedance Zc is 10Ω≤Zc≤300Ω. If the characteristic impedance is less than 10Ω, the loss caused by the conductor and the dielectric becomes relatively large. In addition, if the characteristic impedance is greater than 300Ω, matching with the system impedance cannot be achieved.
[0132] Figure 6, will use the th...
Embodiment 2
[0142] A Kaiser window in which A=40 was used, where the reflectance in the frequency f range of 3.6 GHz≦f≦10.1 GHz was set to 1, and the reflectance in other regions was set to 0. In addition, the length of one wavelength at a frequency f = 1 GHz of the signal transmitted in the microstrip line was defined as the waveguide length, and the characteristic impedance of the system was set to 50Ω, and the design was performed. Figure 10 will use thickness h=0.635mm, dielectric constant ε r The distribution of the width w of the microstrip line in the z-axis direction in the case of the dielectric layer 4 (for example, RT / duroid (registered trademark) 6010LM) = 10.2 is shown simultaneously with the width in the case of not using the Kaiser window. Tables 4 to 6 show a list of the dimensions of the width w of the microstrip line when the Kaiser window is used.
[0143] Table 4: List of microstrip line sizes (1 / 3)
[0144] z[mm]
w[mm]
0.00
0.60
0.11 ...
Embodiment 3
[0152] A Kaiser window in which A=25 was used, where the reflectance in the frequency f range of 3.4 GHz≦f≦10.3 GHz was set to 1, and the reflectance in other regions was set to 0. In addition, the length of one wavelength at a frequency f = 1 GHz of the signal transmitted in the microstrip line was defined as the waveguide length, and the characteristic impedance of the system was set to 30Ω, and the design was performed. Figure 14 will use the thickness h = 0.635mm, dielectric constant ε r The distribution of the width w of the microstrip line in the z-axis direction in the case of the dielectric layer 4 (for example, RT / duroid (registered trademark) 6010LM) = 10.2 is shown simultaneously with the width in the case of not using the Kaiser window. Tables 7 to 9 show a dimension list of the width w of the microstrip line when the Kaiser window is used.
[0153] Table 7: List of microstrip line sizes (1 / 3)
[0154] z[mm]
w[mm]
0.00
1.47
0.11
...
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