Recent advances in microwave active filter design. Part 2: Tunable structures and frequency control techniques

✍ Scribed by Laurent Billonnet; Bernard Jarry; Stephen E. Sussman-Fort; Eric Rius; Gérard Tanné; Christian Person; Serge Toutain

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 506 KB
• Volume: 12
• Category: Article
• ISSN: 1096-4290
• DOI: 10.1002/mmce.10004

✦ Synopsis

This two-part paper presents a representative sample of recent advances in microwave active filter design. In the second part, we discuss design techniques for tunable structures and frequency control. First, we present switchable and continuously-tunable bandstop filters employing MMIC negative resistances to compensate for losses. Next, we detail several approaches to the design of tunable high-order "recursive-like" filters. Layouts and measurements are given for different MMIC implementations, with simulated results presented in other instances. Finally, we discuss new technologies and processes for future low-cost, low-noise microwave MMIC active functions. The article concludes with the description of a development, including experimental results, of frequency-control techniques based on locked-loop architectures.