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xvi<br />

Contents<br />

8.1.4. Prototype Selectivity Graphs, 281<br />

8.1.5. Summary <strong>of</strong> Prototype Network, 282<br />

8.2. <strong>Design</strong>ing with Land C Inverters, 283<br />

8.2.1. Simple \. and C Inverters, 283<br />

8.2.2. Magnetically Coupled Inverters, 284<br />

8.2.3. An Accurate Stopband Selectivity Estimate, 285<br />

8.2.4. A <strong>Design</strong> Example, 286<br />

8.2.5. Summary <strong>of</strong> <strong>Design</strong>ing With Simple Land C Inverters, 289<br />

8.3. General Inverters, Resonators, and End Couplings, 290<br />

8.3. I. Inverters in Admittance Parameters, 290<br />

8.3.2. Trap Inverters, 292<br />

8.3.3. Dissipation Effects, 295<br />

8.3.4. Equivalent Resonators, 297<br />

8.3.5. End Coupling, 302<br />

8.3.6. Summary <strong>of</strong> Inverters, Resonators, and End Couplings, 303<br />

8.4. Four Important Passband Shapes, 304 .<br />

8.4.1. The Chebyshev Overcoupled Response Shape, 305<br />

8.4.2. The Butterworth Maximally Flat Response Shape, 308<br />

8.4.3. The Fano Undercoupled Response Shape, 310<br />

8.4.4. Comparison <strong>of</strong> Elliptic Family Responses, 3\3<br />

8.4.5. The Minimum-Loss Response Shape, 314<br />

8.4.6. Summary <strong>of</strong> Four Important Passband Shapes, 319<br />

8.5. Comments on a <strong>Design</strong> Procedure, 321<br />

8.5.1. <strong>Design</strong> Flowchart, 321<br />

8.5 .2. <strong>Design</strong> Limitations, 323<br />

8.5.3. Adjustment <strong>of</strong> Shunt-\. Values, 323<br />

8.5.4. Sensitivities, 324<br />

8.5.5. Tuning, 325<br />

8.5.6. Summary <strong>of</strong> Comments on a <strong>Design</strong> Procedure, 327<br />

8.6. A Complete <strong>Design</strong> Example, 327<br />

8.6.1. Response Shapes, 328<br />

8.6.2. Physical Data, 328<br />

8.6.3. Pass Band, 328<br />

8.6.4. Stop Bands, 328<br />

8.6.5. Q Effects, 329<br />

8.6.6. <strong>Design</strong> Limitations, 329<br />

8.6.7. Minimum Shunt Inductance, 329<br />

8.6.8. Prototype Ohmic Values, 330<br />

8.6.9. Component Acceptability, 330<br />

8.6.10. Shunt Inductance Adjustment, 330<br />

8.6.1 I. Final Component Values, 330<br />

8.6.12. Performance and Sensitivity Analysis, 331<br />

8.6.13. <strong>Design</strong> Adjustment, 332<br />

Problems, 332<br />

9, Other Direct Filter <strong>Design</strong> Methods<br />

9.1 Equal-Stub Admittance Filters, 336<br />

9.1.1. Equal-Stub-Filter Development, 336<br />

335

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