The design of single-section and wideband symmetrical three-line microstrip couplers

✍ Scribed by J. C. Coetzee; M. M. Nieuwoudt

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 614 KB
• Volume: 13
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/(sici)1098-2760(19961020)13:3<165::aid-mop14>3.0.co;2-7

✦ Synopsis

plotted as in the figure, whereas the BER is less than loP2". The results indicate that the use of circular polarization significantly reduces the BER of the channel when compared with linear polarization. In particular, from Figure , when the transmission rate is up to 160 Mbps, the error for the case of linear polarization is irreducible. On the contrary, the BER performance is still good when circular polarization is employed. From Figure (a), it is seen that the degradation in SNR for BER = loP6 at 125 Mbps is about 10 dB for horizontal polarization relative to the circular polarization.

IV. CONCLUSIONS

The superiority of circular polarization over linear polarization on BER performance for indoor wireless high-speed communication is demonstrated by computer simulation. The impulse response of a single room is calculated by considering the finite-thickness wall with complex permittivity, short dipole antenna, and up to five bounces of reflection. By using the impulse response of the multipath channel, the BER in high-speed transmission channel for vertical, horizontal, and circular wave transmission/reception have been calculated.

Numerical results show the BER is reduced by the use of circular polarization instead of linear polarization under the same condition. This is because delay waves for circular polarization are effectively suppressed compared with those for linear polarization. Finally, our future research will be directed toward experimental verifications.