The introduction of a fractional bandwidth parameter for bandpass filters significantly impacts performance and realizability. Over the years, a number of unique distributed bandpass structures have been developed which provide the best possible performance for certain characteristics at the expense of others. There is no one best solution for all applications. The designer who attempts to apply a favorite structure to all problems will not have the success of those who learn to match filter structures and required specifications. Therefore, this chapter is a study of a range of distributed bandpass structures and the advantages and disadvantages of each. We close with a powerful technique for taming the tricky process of tuning bandpass filters of all types.

Chapter Contents:

• 8.1 Direct-Coupled Bandpass
• 8.2 End-Coupled Bandpass
• 8.3 End-Coupled Bandpass Example
• 8.4 Coaxial End-Coupled Example
• 8.5 Edge-Coupled Bandpass
• 8.6 Edge-Coupled Bandpass Example
• 8.7 5.6 GHz Edge-Coupled Measured Data
• 8.8 Tapped Edge-Coupled Bandpass
• 8.9 Hairpin Bandpass
• 8.10 1.27 GHz Hairpin Example
• 8.11 1.27 GHz Hairpin Measured Data
• 8.12 5.6 GHz Hairpin Example
• 8.13 Hairpin Resonator Self-Coupling
• 8.14 Combline Bandpass
• 8.15 Coupled-Microstrip Combline Example
• 8.16 1.27 GHz Tapped-Slabline Combline
• 8.17 1.27 GHz Combline Measured Data
• 8.18 Interdigital Bandpass
• 8.19 Tapped-Interdigital Example
• 8.20 Coupled-Interdigital Example
• 8.21 Transmission Zeros in Combline
• 8.22 Stepped-Impedance Bandpass
• 8.23 Stepped-Impedance Measured Data
• 8.24 Elliptic Direct-Coupled Bandpass
• 8.25 Elliptic Direct-Coupled Bandpass Example
• 8.26 Elliptic Bandpass Measured Data
• 8.27 Evanescent Mode Waveguide Filters
• 8.28 Evanescent Mode Loading Capacitance
• 8.29 Coupling to Evanescent Mode Waveguide
• 8.30 Reentrance in Evanescent Mode Filters
• 8.31 996 MHz Evanescent Mode Filter Example
• 8.32 5.6 GHz Evanescent Mode Filter Example
• 8.33 Filters with Arbitrary Resonator Structure
• 8.34 Hidden-Dielectric Resonator Example
• 8.35 Bandpass Tuning Techniques
• 8.36 References

Inspec keywords: band-pass filters; circuit tuning

Other keywords: fractional bandwidth parameter; bandpass filter tuning; distributed bandpass structures

Subjects: Filters and other networks