A channelized receiver can be considered to be many fix tuned superheterodyne receivers operating in parallel. It has all the good characteristics of a superhet receiver: high sensitivity, wide dynamic range, and fine-frequency resolution. The bandwidth of the receiver is proportional to the amount of hardware used in the receiver. The more channels built, the more bandwidth the receiver can cover. But the large number of parallel channels also make the receiver bulky and expensive. The most critical portion of a channelized receiver is to determine which slot contains the input signal. Although several approaches have been presented in this chapter, a thoroughly theoretical study may improve the frequency-determining scheme. Using SAW filters in a channelized receiver may reduce the size and possibly the cost, but the SAW filters also seem to degrade the performance of the receiver. Further research in filter technology is required to improve receiver performance. Finally, reducing the receiver size is another research topic to be investigated.

Chapter Contents:

• 7.1. Introduction
• 7.2. Design Considerations of Filter Banks
• 7.3. Frequency Multiplexing through Power Divider
• 7.4. Frequency Multiplexing through Directional Filters
• 7.5. Frequency Multiplexing through Microwave Lens
• 7.6. Hybrid Couplers and Their Applications to Frequency Multiplexing
• 7.7. Dielectric Filter Bank
• 7.8. Surface Acoustic Wave (SAW) Filters
• 7.9. Characteristics of SAW Filters
• 7.10. Coarse-Frequency Channelization
• 7.11. Frequency Measurement Considerations in Channelized Receivers
• 7.12. Frequency Determination through Frequency Domain Comparison
• 7.13. Frequency Determination through Time Domain Comparison
• 7.14. Dual-Detection Scheme to Determine Frequency
• 7.15. Energy Detection Scheme to Determine Frequency
• 7.16. Peak Valley Comparison Scheme to Determine Frequency
• 7.17. Frequency Determination with Slots Containing Amplitude Information
• 7.18. Modeling of Channelized Receivers
• 7.19. Frequency-Selective Limiters
• 7.20. Summary
• References

Inspec keywords: surface acoustic wave filters; radio receivers; channel bank filters

Other keywords: SAW filters; parallel channels; wide dynamic range; high sensitivity; receiver bandwidth; input signal; fine-frequency resolution; channelized receivers; frequency determining scheme; superheterodyne receivers

Subjects: Radio links and equipment; Passive filters and other passive networks; Acoustic wave devices