On boundary conditions and constitution of homogeneous materials

✍ Scribed by Akhlesh Lakhtakia

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 62 KB
• Volume: 48
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.21259

✦ Synopsis

frequency changed, by including the series resistance value (0.8⍀) in the model, by a maximum of 36 MHz for the 0°angle.

For the chosen varactor diodes, the electrical shift in the bandstop frequency of the filter, shown in Figure 3, is 150 to 200 MHz (depending on ⌰). This shift can be increased by using a series of varactor diodes or varactor diodes of higher tuning range [6]. The filter's performance is expected to be improved further using microelectromechanical systems (MEMS) varactors.

4. CONCLUSION

The results have demonstrated wide-bandwidth tunability in the L/S-band frequency range, 94.6%, with the minimum achievable 10-dB bandwidth of 18 MHz at a rotational angle of 72°for the two-square-element filter. Shifts in the band-stop frequency due to the mechanical rotation of the microstrip elements are shown to be compensated by electrical tuning of the varactor diodes.