INTERNATIONAL JOURNAL OF SCIENTIFIC & TECHNOLOGY RESEARCH VOLUME 9, ISSUE 02, FEBRUARY 2020 ISSN 2277-8616 3492 IJSTR©2020 www.ijstr.org Design Of Miniaturized, Two Elements 6-Band Mimo Antenna With Patch Isolator Ashish A. Jadhav, Dr. Nagashettappa Biradar, Husain Bhaldar, Mahesh. S. Mathpati ,. Sujit A. Inamdar Abstract: Use of MIMO (Multiple input multiple output) for advance wireless communication is trending since last couple of decades. Multiband systems, such as WiFi (Wireless Fidelity), Bluetooth, or BLE (Bluetooth Low Energy) are referred as the way of advanced communication technology. These communication technologies are operating at a commonly used ISM frequency band, 2.4GHz. This frequency band is unlicensed and free to use. In this article, designed MIMO antenna can be used at 2.51GHz, 4.15 GHz, 6.04 GHz, 2.36 GHz, 3.68 GHz and 5.47GHz frequencies. This MIMO antenna is designed by using multiple patches on single ground plane, separated by Isolator. Improvement in VSWR, Directivity and Gain can be achieved by using microstrip patch antenna. Return loss of Designed MIMO is below -10dB and VSWR is in between 1 to 2. Isolator is used to reduce mutual coupling between the patches of MIMO antenna. Index Terms: Microstrip Patch Antenna, Isolator, MIMO, Multiband Antennas, —————————— ◆ —————————— 1 INTRODUCTION Multiple input multiple outputs has several advantages over the conventional SISO (Single input single output) transmit receive method. In terms of channel capacity, SISO faces bottleneck issues which highly degrade the performance of the communication system. MIMO means use of multiple antennas at transmitter for transmission and multiple antennas at receiver for reception of electromagnetic waves. MIMO increases channel capacity as number of elements in MIMO increases. MIMO enhances the bandwidth of communication. It improves the directivity, Gain and Antenna efficiency since it does not require additional transmit power. The ratio of maximum radiation intensity of the subject antenna to the radiation intensity of an isotropic or reference antenna, radiating the same total power is called the directivity and Antenna Efficiency is the ratio of the radiated power of the antenna to the input power accepted by the antenna. The term antenna gain describes how much power is transmitted in the direction of peak radiation to that of an isotropic source. To maintain VSWR in between 1:2, the approximate value of impedance of a transmission line, must equals the approximate value of the impedance of a transmitter antenna, or vice versa, it is termed as Impedance matching. Impedance matching is necessary between the antenna and the circuitry. The impedance of the antenna, the transmission line, and the circuitry should match so that maximum power transfer takes place between the antenna and the receiver or the transmitter. 2 REVIEW OF LITERATURE The 4 element Multiple Input Multiple output (MIMO) Microstrip Patch Antenna that has 4 ports, been designed and implemented in [1], The proposed antenna consists of four ports with all the four patches operates at LTE and WLAN frequencies 1.8GHz, 2.8GHz, 3.3 GHz. The antenna is fabricated on an inexpensive FR4 material of a dielectric constant of ε = 4.4, with thickness of substrate that is 1.6 mm and the thickness of patch is 0.035 mm. ______________________________ • Prof. Ashish Jadhav. (+918087534202) M.E. Electronics & Telecommunication Asst. Professor, Department of Electronics and Telecommunication Shree Vithal Education And Research Institute COE, Pandharpur, Maharashtra, India. From practical results of [2], it is concluded that the increase in the number of patches on the substrate, data rate and radiation pattern get increased. The Proposed design is of 3 bands which is resonating at three frequencies and that are 1.8GHz, 2.8GHz and 3.3GHz and it gives VSWR in the range of 1 to 2 and the values of S Parameters which are less than - 10 dB. Kartiki Gaikwad et. al. [3], demonstrated, two element slotted patch antenna for two different applications that is Wi- Fi (wireless fidelity) and LTE (long term evolution) which operates on the frequency 2.4GHz and 2.6GHz. Comparison of various methodologies of antenna design and different software tools used for simulation is done to propose powerful techniques to proceed in the field of Microstrip Patch Antenna design for implementation of MIMO systems. Antenna system with high data rate, high gain, wider bandwidth, improved signal quality, higher spectral efficiency, reduced mutual coupling, low cost and small size is the need of today’s wireless communication engineering. Hence, overall objectives of this article is to summarize and study different shapes of MIMO antennas and compare different parameters of various designs of antenna such as Mutual coupling, Resonating Frequency, VSWR, Bandwidth, Data rate, Efficiency, Gain and Return Loss [4]. Multiple input multiple output (MIMO) antennas are great candidates to be utilized in multiband applications. They are capable of supporting high data rate, decreasing multiple fading, increasing channel capacity and improving the reliability of the communication system [5]. Due to decisive aspect of coupling between the MIMO antenna elements, increasing the isolation of close elements is necessary. On the other hand, the compactness is another aspect of the design as well as radiation efficiency and envelope correlation [6]. In recent years, telecommunication researchers increase the isolation of multiband MIMO antennas elements by various techniques. Liao et al. have used inverted F-antenna and a folded slot to miniaturize a dual-band MIMO antenna and decrease the coupling elements [7]. In [8], transmission line decoupling technique has been utilized to increase the isolation of the elements. 3 METHODOLOGY Microstrip Patch antenna is one of the most popular types of printed antenna. It plays a very significant role in today’s world of wireless communication systems. Microstrip antennae are