No abstract

No abstract

This article presents a coplanar waveguide fed global system for mobile communications band integrated ultra wide band (UWB) multiple input multiple output (MIMO) antenna with single and dual notch band characteristics. The novelty of the antenna lies in its design as all the unit cells of the proposed UWB MIMO antenna structure are orthogonal to each other therefore the additional isolation elements responsible for achieving high isolation are not required consequently making proposed antenna design simple and easy to fabricate. In this context, 2 MIMO systems have been designed. The first MIMO system is consisting of a dual port antenna whereas the second MIMO system is a printed quad port antenna; further single and dual notch band are achieved in the proposed multi-port MIMO antenna. The antenna shows pattern diversity throughout the impedance bandwidth range. The gain of the antenna varies from 4 to 8.48 dBi. The 2 band notches are achieved at 4.8 and 7.7 GHz in the UWB range. The proposed antenna is fabricated and it is found measured results are in good agreement with simulated results.The emerging wireless and mobile communication applications demand diverse and versatile antennas which are low profile, easy to fabricate and integrable with the handheld integrated circuit along with high data rate and superior quality of service. In recent wireless communication systems, the major problem is multipath fading which is due to reflection, refraction and diffraction of electromagnetic waves in free space. The problem of multipath fading can be resolved by making use of frequency diversity, spatial diversity, or polarization diversity technique. The concept of multiple input multiple output (MIMO) is very much useful for reducing the multipath fading effects thereby achieving superior data rate, range and reliability without increasing any transmit power or bandwidth. However, due to limited availability of space in the handheld devices, the placement of multiple antennas inside the device is a challenging task. Because of closely operating frequencies and space limitations the radiating elements are exposed to high mutual coupling amongst them. Therefore, there is a need for compact and efficient MIMO antenna with low mutual coupling, high isolation and unwanted frequency band suppression.As per Federal Communication Commission, the bandwidth allocated for unlicensed ultra wide band (UWB) spectrum range is from 3.1 to 10.6 GHz. 1 Due to such large operating range UWB antennas can be employed for shortrange radars, medical imaging, high data rate transmission, broadband wireless applications, and so forth. In the last few years, various designs of UWB MIMO antennas have been proposed by a number of researchers. A few of them employ simple monopole antennas with rectangular, circular, elliptical, and trapezoidal shapes with wide impedance bandwidth and improved radiation properties, 2-6 therefore, covering several mobile wireless standards. In 2 antenna structure with 2 radiating element is proposed with common...

No abstract

No abstract