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Planar SIR microwave bandpass filter using high-permittivity ceramics

✍ Scribed by Cheng-Liang Huang; Pau-Yeou Yen; Min-Hung Weng

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
248 KB
Volume
26
Category
Article
ISSN
0895-2477

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✦ Synopsis

Figure 4 Experiment at RF band; carrier at 462.5625 MHz, sine Ž . Ž. wave of 4 kHz information @voltage amplitude of 0.1 V. a Spec-Ž . Ž . Ž . Ž . trum of transmitted RF signal. b Scope view of h y versus h x . c Ž . Ž . Original information top and recovered information bottom gation. The lagged synchronization is also illustrated in Fig- . ure 4 c . By comparing with the original signal, the recovered signal is replicated, except that there is a time delay of about 30 s. Such a delay usually does not cause any harmful effect in a general voice communication system.

3. Conclusions

In this letter, a secure communication system employing chaotic synchronization has been systematically investigated. Theoretical analysis has been developed based on the Rossler ¨oscillators in Lur's form. In addition, experiments have been conducted at both the baseband and radio frequency to verify the validity of our design and the feasibility of the proposed secure communication systems. The circuit implementation is simple, and the communication quality is reliable. The system is useful for those analog communications where high privacy is required. REFERENCES 1. K.M. Cuomo and A.V. Oppenheim, Circuit implementation of synchronized chaos with applications to communications, Phys Ž .

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