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Tkinter Chat-Bot Application using NLP

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This paper presents design and analysis of an efficient U-Slot Rectangular microstrip patch antenna for the application of Wireless LAN for operating frequency 2.85 GHz. U-shaped slot on the patch of the coaxially fed rectangular patch antenna increase the bandwidth. substrate with relative permittivity 2.24 and loss tangent 200e-6 was used as Dielectric material with a height of 4.75 mm. The antenna was designed and simulated using HFSS. A bandwidth of 374.733 MHz was achieved with a gain of 7.1304 dB. Performance parameters like VSWR, Reflection coefficient and Impedance are very good in arguments.

INTRODUCTION

????????? It is well known that microstrip antennas have very narrow impedance bandwidth, typically a few per cent. One of the methods of widening the bandwidth is to cut a U-shaped slot on the patch of the coaxially fed rectangular patch antenna [l]. Microstrip antennas have been widely used in many modern communication systems, because of its planar profile, and low cost [2].Most of these antennas operate at their fundamental mode TM01, which results in broadside beam [3]. The Ushaped slot along with the finite ground plane are used to achieve an excellent impedance matching to increase the bandwidth[4].Being such advantageous, a slot of U-shaped on the rectangular shaped patch antenna is considered for our design. The U-slot introduces a capacitive component to counteract the large input inductance when thick substrate is used [5]. These features have attracted a huge area of interest and have been widely used in satellite communications, aerospace, mobile and many more applications. In this paper basic structure of Microstrip patch antenna was taken under design consideration. Microstrip patch antenna uses a radiating patch of perfectly conducting material separated from the copper ground plane using dielectric substrate material. Coaxial probe feed method, being easy and flexible (as it can be placed at any desired location to match impedance), was considered for our design.

EXISTING SYSTEM

  • Printed slotted antenna
  • Microstrip patch antenna capable of working in up-to 1 to 2 bands only

DISADVANTAGES

  • reconfigurable CP antennas have been reported extensively in the literature, using variety of structures such as crossed dipole, patch, radiating arms and slot, however only for low frequency applications. All these designs utilize single-element structure with PIN diodes that exhibit nearly ideal performance in the microwave frequency range.

PROPOSED SYSTEM

In this paper, the radiators consist of patch antennas resonating at 2.8 GHz. The design uses Roger Duroid 5880 substrate (relative permittivity ?r = 2.2 with estimated tan? ? 0.0025 at 2.8 GHz). The simulation, modelling and optimization are conducted using the ANSYS High Frequency Structure Simulator (HFSS).

ADVANTAGES

  • There are many advantages of this tri-band MIMO antenna such as the small volume, light weight and easy integration, low cost, easy fabrication.

APPLICATIONS

It has good application value in modern wireless communication systems.

SOFTWARE REQUIRED

  • ANSYS HFSS v1

REFERENCE

[1] M. N. Tehrani, M. Uysal, and H. Yanikomeroglu, “Device-todevice communication in 5G cellular networks: challenges, solutions, and future directions,” IEEE Communications Magazine, vol. 52, pp. 86-92, 2014.

[2] L. Ge, X. Yang, D. Zhang, M. Li, and H. Wong, “PolarizationReconfigurable Magnetoelectric Dipole Antenna for 5G Wi-Fi,” IEEE Antennas and Wireless Propagation Letters, vol. 16, pp. 1504-1507, 2017.

[3] H. H. Tran, N. Nguyen-Trong, T. K. Nguyen, and A. M. Abbosh, “Bandwidth Enhancement Utilizing Bias Circuit as Parasitic Elements in a Reconfigurable Circularly Polarized Antenna,” IEEE Antennas and Wireless Propagation Letters, vol. 17, pp. 1533-1537, 2018.

[4] K. L. Chung, S. Xie, Y. Li, R. Liu, S. Ji, and C. Zhang, “A Circular-Polarization Reconfigurable Meng-Shaped Patch Antenna,” IEEE Access, vol. 6, pp. 51419-51428, 2018.

[5] J. Hu, G. Q. Luo, and Z. Hao, “A Wideband Quad-Polarization Reconfigurable Metasurface Antenna,” IEEE Access, vol. 6, pp. 6130-6137, 2018.

[6] Z. Wu, H. Liu, and L. Li, “Metasurface-Inspired Low Profile Polarization Reconfigurable Antenna With Simple DC Controlling Circuit,” IEEE Access, vol. 7, pp. 45073-45079, 2019.

[7] H. C. Sun and S. Sun, “A Novel Reconfigurable Feeding Network for Quad-Polarization-Agile Antenna Design,” IEEE Transactions on Antennas and Propagation, vol. 64, pp. 311316, Jan 2016.

[8] W. Lin and H. Wong, “Wideband Circular-Polarization Reconfigurable Antenna With L-Shaped Feeding Probes,” IEEE Antennas and Wireless Propagation Letters, vol. 16, pp. 21142117, 2017.

[9] W. Lin and H. Wong, “Wideband Circular Polarization Reconfigurable Antenna,” IEEE Transactions on Antennas and Propagation, vol. 63, pp. 5938-5944, 2015.

[10] K. M. Mak, H. W. Lai, K. M. Luk, and K. L. Ho, “Polarization Reconfigurable Circular Patch Antenna With a C-Shaped,” IEEE Transactions on Antennas and Propagation, vol. 65, pp. 13881392, 2017.

[11] S. Zhou, G. Huang, H. Liu, A. Lin, and C. Sim, “A CPW-Fed Square-Ring Slot Antenna With Reconfigurable Polarization,” IEEE Access, vol. 6, pp. 16474-16483, 2018.

[12] K. Li, Y. Shi, H. Shen, and L. Li, “A Characteristic-Mode-Based Polarization-Reconfigurable Antenna and its Array,” IEEE Access, vol. 6, pp. 64587-64595, 2018.

[13] W. Lin, S. Chen, R. W. Ziolkowski, and Y. J. Guo, “Reconfigurable, Wideband, Low-Profile, Circularly Polarized Antenna and Array Enabled by an Artificial Magnetic Conductor Ground,” IEEE Transactions on Antennas and Propagation, vol. 66, pp. 1564-1569, 2018.

[14] A. Clemente, L. Dussopt, R. Sauleau, P. Potier, and P. Pouliguen, “1-Bit Reconfigurable Unit Cell Based on PIN Diodes for Transmit-Array Applications in X-Band,” IEEE Transactions on Antennas and Propagation, vol. 60, pp. 22602269, 2012.

[15] M. Asaadi and A. Sebak, “High-Gain Low-Profile Circularly Polarized Slotted SIW Cavity Antenna for MMW Applications,” IEEE Antennas and Wireless Propagation Letters, vol. 16, pp. 752-755, 2017.

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