NETWORK BEAMFORMING WITH ROTMAN LENS ANTENNA FOR MOBILE COGNITIVE RADIO BASE STATION IN DISASTER RECOVERY NETWORKS

NOVIA NURHIDAYAH PRIHATININGTYAS

Informasi Umum

Kode

22.05.040

Klasifikasi

621.382 54 - Antennas and propagation

Jenis

Karya Ilmiah - Thesis (S2) - Reference

Subjek

Antennas & Propagation

Dilihat

168 kali

Informasi Lainnya

Abstraksi

Mobile Cognitive Radio Base Station (MCRBS) is a technology to recover communication in the disaster area, where a problem arises when MCRBS needs the best routing but the antenna is unable to focus the transmission to the particular area. To solve this problem, this thesis proposes a network beamforming with Rotman lens connected to array antenna that has amplitude distributions and phase shifting to direct beam to several directions for supporting backbone link construction in postdisaster networks using multiple MCRBSs.

The Rotman lens is designed to simultaneously transmit signal from MCRBS to other MCRBS without moving the antenna system. The Rotman lens is selected because it is practical and having low cost, compact design, and wide-angle scanning. Array antenna with slotted rectangular patch is used for thin substrates for compact design and provides directive characteristics to reach directional radiation pattern. This thesis performs computer simulations and makes a hardware realization of the Rotman lens and antenna design.

This thesis has successfully designed the Rotman lens connected to array antenna to switch and steer the beam into 5 directions. This thesis has obtained S-parameters having: (i) the reflection coefficient for return loss beam ports below -15 dB and average value for the coupling beam port below -30 dB and (ii) the transmission coefficient for phase error performance of maximum in 6 degree and amplitude performance for insertion loss and sidelobe level below 3 dB and -4 dB, respectively. The integrated Rotman lens and antenna has achieved the performances to switch and direct the beam in -23 degree,-9 degree, -2 degree, 21 degree, 25 degree. This thesis founds that: (i) the Rotman lens properly considers parameters of ?, ?, f1, and ? to create compact design for effecting electrical length from beam contour through array contour on controlling beam steering capability, and (ii) the phase error is important factor to evaluate the effectiveness of Rotman lens phase performance. The results above shows that the proposed network beamforming with Rotman lens connected to antenna satisfied the MCRBS requirements to direct beam with less losses power for effectively supporting backbone communication link between MCRBSs in disaster recovery networks.