Abstract
Mobile broadband communication systems like the fifth generation (5G) will require large bandwidth allocation. Currently, the sweet spot is congested with no enough spectrum to support higher bandwidth allocation. The millimeter wave band is being explored to provide the needed spectrum with 28 GHz so far identified as a potential carrier frequency. Development of complimentary antennas for transmission and reception on the band therefore become necessary. This paper present the design of linearly polarized radial line slot array antenna at 28 GHz for mobile broadband communication system application. The antenna consists of radiating surface with radius ρ sitting on squared cavity and ground of side 2ρ. It is excited via a rear center mounted modified straight dielectric coated 50 Ω SSMA connector. The cavity is filled with layers of air space, low dielectric constant syntactic foam and high frequency laminate RT/duroid 5880. With ρ = 50 mm and a maximum total cavity height of 3.0 mm, the antenna was simulated using Computer Simulation Technology Microwave Studio 2014 software. A gain of 18.13 dB, directivity of 18.4 dBi, efficiency of 96 % and impedance bandwidth of up to 2.34 GHz were realized.
Highlights
Generation mobile communication systems like the fifth generation (5G) is being developed and is expected to accommodate the fast growing data intensive and multimedia based applications
With no much space on the current band to provide for larger bandwidth allocation, many options including the use of 3-300 GHz band (sometimes referred as millimeter wave band (Zhouyue & Khan, 2011)) are being considered
Building on that and using the idea demonstrated by (Chen & Chia, 2006; Ibrahim et al, 2014) for using air cavity to boost bandwidth in broadband planar antennas, we proposed three layered cavity filling material linearly polarized Radial Line Slot Array (RLSA) antenna at 28 GHz to improve the bandwidth
Summary
Generation mobile communication systems like the fifth generation (5G) is being developed and is expected to accommodate the fast growing data intensive and multimedia based applications. It is expected to utilize the millimeter wave spectrum, support high speed data rates, use energy friendly devices and network infrastructure. It was in that respect (Khan et al, 2012) suggested that any antenna for 5G application must have an impedance bandwidth of at least 1.0 GHz and gain of 12 dB. Microstrip antennas have been a popular choice for applications on the current licensed bands for mobile communication. With no much space on the current band to provide for larger bandwidth allocation, many options including the use of 3-300 GHz band (sometimes referred as millimeter wave band (Zhouyue & Khan, 2011)) are being considered. Radial Line Slot Array (RLSA) antenna with its starling characteristic of high gain, low cost, ease of manufacture, attractive radiation characteristics and high efficiency (Ando et al, 1988; Takahashi et al, 1992) becomes a good candidate
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