. The Bell System technical journal . Transmitting Band. Fig. 4—General Mid-Shunt Equivalent Low-Band-and-High Pass Wave-Filter shown in Fig. 4. The impedance diagram indicates how the trans-mitting and attenuating bands are produced. Here each anti-reso-nant component in the series impedance is responsible for one of theinfinite attenuations shown in the equivalent attenuation diagram ofFig. 3. It may be seen also that when in practice it is necessary tobalance the two sides of the line, the wave-filter of Fig. 4 requiresmore series balanced inductances and capacities than that of Fig. 3to gi
. The Bell System technical journal . Transmitting Band. Fig. 4—General Mid-Shunt Equivalent Low-Band-and-High Pass Wave-Filter shown in Fig. 4. The impedance diagram indicates how the trans-mitting and attenuating bands are produced. Here each anti-reso-nant component in the series impedance is responsible for one of theinfinite attenuations shown in the equivalent attenuation diagram ofFig. 3. It may be seen also that when in practice it is necessary tobalance the two sides of the line, the wave-filter of Fig. 4 requiresmore series balanced inductances and capacities than that of Fig. 3to give an equivalent propagation constant. For this reason the mid-shunt equivalent wave-filter is usually not as economical as the mid-series equivalent wave-filter. 3. M-Type Wave-Filters. The term M-type will be applied to that case in each of the abovegeneral wave-filters in which the coefficients mx . . mn coalesce to THEORY AND DESIGN OF WAVE-FILTERS 17 the single value m,\ = . . = mn = m, leaving but one degree of are of special i
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