IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-ISSN: 2278-2834,p- ISSN: 2278-8735.Volume 16, Issue 4, Ser. I (Jul. – Aug. 2021), PP 23-27 www.iosrjournals.org DOI: 10.9790/2834-1604012327 www.iosrjournals.org 23 | Page Design and Simulation of Ultra Wide Band Planar Inverted –F Antenna at 10.8ghz Application Onomendo O.E. Dr.O.J.Ataman Department of Natural Sciences, College of Education, Igueben, Edo State. Abstract: The demand for high data rate in modern day wireless communication is on the increase and requires a miniature device. Ultra wide band is one of the techniques for high frequency band. Microstrip patch antenna has gain popularity in the design of UWB. In this study, a coaxial fed Planar inverted –F Antenna with one slot for Ultra wide band resonating at 10.8GHz was designed with a reduced height and with a better performance of antenna parameters. The High Frequency Software Structure (HFSS) was used. The substrate used is FR4 with dimensions 62.5mm x56mm having a height of 0.8mm dielectric constant of 2.2. A patch with dimension of length 23.5mm and width 15mm was considered. The result shows antenna operating on an UWB frequency range of 8.5GHz to 10.8GHz having a return loss less than -10dB, directivity of 5.77dBi, gain of 4.60dB, a bandwidth of 9.1% axial polarization of   and efficiency of 80%. The research has met up with standard as compared to conventional antennas and it is therefore recommended to carry out more research using other simulator package, the change against the non-correlation of simulated and calculated value. There is need for fabrication of the designed antenna. Key Words: Ultra wide band, Planar Inverted –F Antenna(PIFA),Substrate -------------------------------------------------------------------------------------------------------------------------------------- Date of Submission: 28-07-2021 Date of Acceptance: 12-08-2021 --------------------------------------------------------------------------------------------------------------------------------------- I. Introduction Antenna plays a crucial and vital role in telecommunication field such as satellite communication, security, mobile phone, sending signals, and for military use (Li et al., 2010).Ultra Wide Band (UWB) is a radio technology that can be used for transmitting and receiving a large amount of data over an ultra-wide band frequency with very low power and for short distances (Breed, 2005). It has some advantages like high data rate, low equipment cost, multipath immunity and finally ranging and communication at the same time is possible. In all wireless communication systems, the antenna has an essential role since it is the means by which the signals are converted from electrical to electromagnetic wave form and vice versa. The design of an UWB antenna is subject to numerous challenges such as achieving a wide impedance bandwidth and keeping high radiation efficiency. This has been the subject of many studies (Vaderaset al., 2010).Recently, design for novel planar antenna are used in fulfilling specifications for specific bandwidth especially in systems used in mobile communication. Devices used in wireless communication uses planar antenna due it is miniaturization. The planar inverted-F antenna is dominating the digital world of design of antenna today not only because of its miniaturization but also due to it is low profile and omnidirectional pattern. The PIFA antenna is fed at the base of the feed wire at the point where the wire connects to the plane. It also has a shorting plates that provides good impedance matching for effective radiation which is a prerequisite for outstanding antenna. Anoop Varghese and Kazi Aslam (2015),fabricated an antenna using the FR4 substrate at a low cost which occupies a small space the work was design for Global System Mobile, digital system communication and personal communication system band. The voltage standing wave ratio (VSWR) with respect to frequency which was observed to be with an antenna impedance bandwidth that extends from 0.83- 0.91GHz and 1.72-2.10GHz with VSWR less than 2. The bandwidth of 84MHz was obtained for a resonance frequency of 0.87GHz and a bandwidth of 382MHz was obtained from a resonant frequency of 1.89GHz reading a directivity with a peak value of 3.90dB. The characteristics parametric performance of their work is not as expected. Joseph and Ali (2016) develop an UWB for MIMO antenna of frequency band of 3.1GHz to 10.6GHz adopting the PIFA with a circular monopole disc printed in a block of FR-4 dielectric substrate with a relative permittivity of 4.6. The design met the main requirements but the radiation pattern and radiation efficiency of 70% is not too encouraging.