16x8 Wideband Microstrip Planar Array Antenna for E-Band Millimeter-Wave 5G High Speed WLAN and Broadband Internet Applications Ahmed Hassanien1 W. Swelam2, Mohamed H. Abd El Azeem2 Electronics and communication dept. 1 MUST University in Egypt 6th October, Egypt. firstname.lastname@example.org Electronics and communication dept. 2 AAST Academy in Egypt Cairo, Egypt. email@example.com firstname.lastname@example.org Abstract—In this paper the design, and simulation of a 16x8 wideband microstrip planar array antenna which covers E- band frequency from 81 GHz up to 86 GHz with 5GHz bandwidth has been investigated and more than 14 dBi gain has been achieved. The designed array etched on Rogers RO-3003 substrate which enables it to be used in high speed point to point wireless local area networks and broadband internet access applications. element doesn’t fulfil directivity requirement for point-to-point applications. The final section gives the conclusion. Maintaining the Integrity of the Specifications Keywords— Microstrip Patch Antenna (MSA), Antenna Array, E-band frequency, mm-wave applications, 5G. I. INTRODUCTION Telecommunications have experienced an exponential growth over the past three decades. The amount of data which the average person uses keeps increasing at exponential rates in the present day . This growth is more noticeable in the evolution of wireless communications . The needs for higher speed have increased accordingly, making researchers search for means to improve the data rates. Frequency band from 30GHz up to 300GHz is called Millimeter-wave “mm-wave”. This band will expand channel bandwidths which results in increasing the capacity and decreasing the latency . This band also allows new applications such as information showering, vehicular application, replacing wired connection on chips and data centers . This paper deals especially with The E-band Frequencies which covers (71-76, 81-86 and 91-95 GHz) . These bands have very little attenuation below 1dB/km as shown in Fig.1(a) which making them suitable for a long distance mobile and a backhaul application -. Shorter wavelengths for these bands allow using smaller antenna than would be required for similar in lower bands and achieve high gain and directivity. According to these bands signal characteristics and narrow beam width increasing the chance to design closer systems without causing interference as compared to microwave antennas - as shown in Fig.1(b). High directivity of these bands increasing the ability for more efficient use of spectrum for point to point applications and higher reuse of the spectrum as compared to lower frequencies. These frequency bands also have many other advantages such cost-effective high data rate solution, secure data communications, this spectrum could be used as a replacement for fiber optics -. The following sections show the design, results and discussion of the antenna array since the single 978-1-5386-3284-0/17/$31.00 ©2017 IEEE (a) (b) . Fig. 1. (a) Attenuation chart  , (b) Beam-width of millimeter wave and microwave  II. DESIGN In this paper Rogers RO-3003 has been used as a substrate with dielectric constant, εr =3, and height, h= 0.127mm. The Rogers RO-3003 substrate was selected because of its favourable properties for millimetre-wave fabrication, its affordable price, and because it possesses the lowest losses among Rogers's commercial line level laminates . All analysis and simulations throughout this paper were carried out using the finite element method (FEM) that uses commercial software Ansoft High Frequency Structure Simulator HFSS .This paper is started by the design of a single microstrip patch antenna with patch dimensions calculated from microstrip equations  etched on previous substrate which operates at 80 GHz frequency as shown in Fig.2 (a), but Fig.2 (b) shows the design of 1x16 series array element with 0.6023mm spacing between elements with total length 27.387mm using series feeding .“Ref.  shows the concept of the quarter wave length transformers as shown in Fig.3 (a),but Fig.3 (b) shows the design of 1x8 feeding network by using this technique” .The design of the 16x8 microstrip patch planar array antenna which consists of 128 patches and feeding network with total length 28.994mm and width 23.87mm is shown in Fig.4. 2613 AP-S 2017 27.387mm 0.6023mm (a) (b) Fig. 2. (a) Single element microstrip patch at 80GHz with dimension 1.3 mm by 1 mm using HFSS. (b) 1x16 single array element series feeding and spacing between elements. Fig. 6. The 8x16 microstrip planar array antenna VSWR. Radiation Pattern 15 Patch_Antenna_ADKv1 Curve Info 0 -30 dB(GainPhi) Setup1 : LastAdaptive Freq='83GHz' Phi='0deg' 30 8.00 6.00 -60 60 4.00 2.00 -90 (a) 90 (b) -120 120 Fig. 3. (a) Quarter wave length transformers . (b) 1x8 feeding network -150 150 -180 III. RESULTS AND DISCUSSION Fig. 7. The 8x16 microstrip planar array antenna gain. An 8 x 16 array gives return loss s11 less than -10 dB in the range from 81 GHz to 86 GHz with 5GHz bandwidth which covers E-band as shown in Fig.5. It has been seen that the bandwidth was improved by 5 times as compared with bandwidth results in  by optimizing distance between elements, but Fig.6 shows the VSWR is less than 2 from 81 GHz up to 86 GHz with 5GHz bandwidth and 90% efficiency, but Fig.7 shows the gain more than 14 dBi but it has high side lobe about 5 dBi with total gain difference 9.384 dBi. This high side lobe due to increasing the element spacing towards λ and can be decrease by using different techniques such as using another substrate with lower dielectric constant, or increasing the number of elements. 23.87mm IV. CONCLUSION This paper shows the design and the simulation of an 8x16 wideband microstrip planar array antenna etched in Rogers RO-3003 substrate. that is can work for high speed point to point wireless local area networks and broadband internet access Applications due to its narrow beamwidth, In the millimetric E-frequency band with good matching is achieved with return loss S11 less than -10 dB within the total frequency bandwidth from 81 GHz up to 86 GHz with resonant frequency 83.1 GHz at -22.22 dB return loss. Total bandwidth 5GHz is achieved with more than 14 dBi with variation of 1.5 dB. 28.994mm V. REFERENCES     Fig. 4. 8x16 microstrip planar array antenna design.     Fig. 5. The return loss S11 for 8 x 16 elements. 2614 Cisco, “The zettabyte era: Trends and analysis (white paper)," 2015. “http://www.cisco.com/c/en/us/solutions/collateral/serviceprovider/visul -networking-index-vni/vni-hyperconnectivity-wp.html”. Rappaport, Theodore S., et al. Millimeter wave wireless communications. Pearson Education, 2014. https://web.mst.edu/~mobildat/E-band%20Frequencies/index.html . Gaucher, Mr Brian, Ulrich Pfeiffer, and Janusz Grzyb. "Advanced millimeter-wave technologies." (2009). Millimeter Wave mobile communications for 5g cellular. “https://www.slideshare.net/raghubraghu/ppt-on-millimeter-wave-c ”. http://www.rogerscorp.com . Balanis, Constantine A. Antenna theory: analysis and design. John Wiley & Sons, 2016. Swelam, W. "80GHz array antenna for mm-wave applications." Antennas and Propagation (EuCAP), 2014 8th European Conference on. IEEE, 2014.