Characteristics of a 2.4-GHz compact shorted patch antenna in close proximity to a lossy medium

✍ Scribed by Kin-Lu Wong; Chun-I Lin

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 180 KB
• Volume: 45
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.20858

✦ Synopsis

We have shown that a MicroPhotonic structure integrating a vertical cavity surface emitting laser (VCSEL) and ultra-wideband photoreceivers can provide an adequate SNR for a practical adaptable FIR delay line, given sufficient launched power. Two reflectivity profiles were considered: a constant profile where the optical power decreases at subsequent taps and a graded profile providing the same optical power at each tap. For a constant-reflectivity profile, we have shown that there is an optimum value for the reflectivity so as to maximize the SNR for a given number of taps and we have further show that for launched optical powers where the receiver thermal noise dominates, there is ϳ4-dB improvement in the SNR offered by grading the reflectivity profile. In a practical MicroPhotonic design, we note that the receivers will need to be integrated so that the signal-path delay through the receivers at each tap is the same and tracks according to temperature.