Page 294 - Complete Wireless Design

Filter Design

Filter Design 293

Figure 6.38 Sixth-order combline distributed BP filter.

Figure 6.39 Sixth-order folded edge-coupled distributed BP filter.

Figure 6.40 Sixth-order interdigital distributed BP filter.

technique for accurate grounded stub measurement and layout is shown in
Fig. 6.41: The length of the stub is measured from the T junction to the center
of the through-hole via.

6.2.3 Distributed filter design

A shorted-stub bandpass filter (Fig. 6.42). The width of the grounded stub is that
of 100-ohm microstrip, while the length of the microstrip is exactly a quarter-

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