Higher order impedance boundary conditions for metal-backed inhomogeneous dielectric layers
✍ Scribed by Vincenzo Galdi; Innocenzo M. Pinto
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 181 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0895-2477
No coin nor oath required. For personal study only.
✦ Synopsis
Figure 3 Effects of MZ᎐EOM half-wave voltage deviations on: a Ž . power penalty, b phase-shift error. N is the LO harmonic order Ž . Ž . N s 1 . . . 10 . While keeping the V f deviation below LO "0.5 V, the power penalty is less than 1.5 dB, and the phase error remains below 3Њ. The limitations caused by Ž . Ž . V f rV f deviations may be neglected as they corre-IF RF
spond to the N s 1 case, in which a significant Ž . Ž . V f rV f deviation of "2 V produces a power penalty IF RF and a phase error below 1 dB and 2Њ, respectively. Therefore, Ž . V f deviations may be neglected in the architecture prew x sented in 2 , but they should be considered for the architecture proposed in this letter when high-order LO harmonic are employed. Finally, it should be pointed out that the results depicted in Figure correspond to a particular bias Ž . voltage value V s 1.58 , which sets a specific phase shift.
bias1
Selecting different bias voltages for distinct phase shift settings results in power penalties and phase errors of slightly different values, but always remaining within "10 dB and Ž . "20Њ, respectively, for the worst analyzed case N s 10 .
4. CONCLUSION
In this letter, the authors have presented a novel architecture which may be easily integrated in a photonic beam-forming feeder. This architecture performs both phase shifting and harmonic uprdown-conversion of an outgoingrincoming RF signal. An investigation on the main limitation of the photonic device performance has also been provided. The results Ž . show that a maximum deviation of "0.5 V for the V f LO parameter is tolerable when employing high LO order har-Ž . monics up to N s 10 , resulting in a power penalty and a phase error below 1.5 dB and 3Њ, respectively.