Open Air Gap Cavity Radial Line Slot Array Antenna For Wireless Backhaul Application

Mohd Ibrahim, Imran (2016) Open Air Gap Cavity Radial Line Slot Array Antenna For Wireless Backhaul Application. PhD thesis, Universiti Teknikal Malaysia Melaka.

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Nowadays, wireless backhaul has become very important due to its capability to carry real-time data streaming. In this system, antenna plays a significant role in establishing effective communication between point to multipoint wireless links. The heightened need of future wireless communication systems (WCS) to have extended service coverage with ultra-high data rate makes the 5 GHz frequency band with centre frequency at 5.8 GHz popular. The future communication system is another promising wireless technology that can be used to fulfil the improvement of signal reception and data throughput. Radial Line Slot Antenna (RLSA) antenna is a popular candidate for many applications such as point to multipoint microwave link, RFID and Wimax Application. This is due to its capability of carrying high speed signal with high directivity characteristic and the capability of beam steering and beam shaping. However, the narrow bandwidth, bulky size, overall weight, high cost and complex realization of RLSA makes it less attractive for future wireless front end deployment. Hence, the techniques for increasing the bandwidth and gain, reducing size, weight and realization costs of RLSA are investigated in this research. Several research works to solve this problem such as implementing the RLSA using FR4 and polypropylene materials have been reported. Nevertheless, this resulted in narrow bandwidth with poor gain RLSA. Hence, to overcome this RLSA design drawbacks, an Open Air Gap Cavity RLSA structure design is presented here. The hybrid cavity method; air gap and FR4 board has been adopted and this managed to reduce the antenna weight and provide wide impedance bandwidth. A 2000 MHz bandwidth and 16 dBi gain has been achieved using hybrid air gap and FR4 board structure at 5.8 GHz. The slot size has been increased to 6 mm and the bandwidth improved to 2300 MHz; gain increased to 17.64 dBi. The air gap technique has also been investigated in millimetre wave frequency at 26 GHz. A 1000 MHz bandwidth was recorded from 25.5 to 26.5 GHz. A simulated 23.45 dBi gain was obtained at 26 GHz. A research contribution here is a technique to improve the compact RLSA bandwidth and gain at 5.8 GHz with a simple cavity structure. The millimetre wave frequencies result shows that the Air Gap RLSA has a potential to be applied in future generation of communication system.

Item Type: Thesis (PhD)
Uncontrolled Keywords: Antennas (Electronics), Wireless LANs, Antenna arrays, Phased array antennas
Subjects: T Technology > T Technology (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Library > Tesis > FKE
Depositing User: Nor Aini Md. Jali
Date Deposited: 31 Jul 2017 00:58
Last Modified: 31 Jul 2017 00:58
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