UNIVERSITY COLLEGE OF ENGINEERING SUBMITTED BY- ANUJ KUMAR BHARDWAJ(09/078) AVINASH KUMAR(09/082) ATYENDRA KASHYAP(10/511) MAHENDRA KUMAR YADAV(09/094) MAHENDER PRAJAPATI(10/513) PROJECT SEMINAR SUBMITTED TO- DR. MITHLESH KUMAR DR. R. S. MEENA MENTOR : Mr. DEEPAK BHATIA (ASSISTANT PROFESSOR)

Presentation On

OBJECTIVE  This Project presents the technique for increasing the bandwidth of Rectangular Patch Antenna from 0.88GHz to 6.75GHz. This technique uses inset feed patch antenna with modified ground plane.  Final simulation shows that the frequency range is obtained from 3.5GHz to 10.04GHz.

INTRODUCTION  A Microstrip Patch Antenna consists of a radiating patch on one side of a dielectric substrate which has a ground plane on the other side Structure of a Microstrip Patch Antenna  For good antenna performance, a thick dielectric substrate having a low dielectric constant is desirable since this provides better efficiency, larger bandwidth and better radiation.  These are mostly used at microwave frequencies.

RECTANGULAR PATCH ANTENNA Width of rectangular Patch is 15.8mm and Length is 8mm. Total Size of this antenna with ground plane is 34 X 20 mm. The antenna is planar rectangular patch fed by microstrip line on the PCB (print circuit board), FR4 substrate with dielectric constant (εr) 4.5 and 1.6 mm of thickness (h).

RECTANGULAR PATCH WITH INSET FEED  We have fixed width(Wfi) of inset feed patch as 0.7mm and vary length of inset feed patch(Hfi) to 4mm, 5mm, 6mm.  Inset feed of 6mm has been selected( due to optimal return loss).  Width of microstrip is 2.8mm for impedance match with 50 ohm.

INSET FEED WITH RECTANGULAR SLOTS ON GROUND PLANE  We modify the ground plane with width of slot(Ws) 12mm and length of slot(Hs) 2mm, 4mm, 6mm.  In this case we obtain the optimum return loss when length of slot(Hs) is 6mm.

INSET L-SHAPED FEED  In Inset L-shaped feed, Length(Hfi) is varied with 2mm, 4mm, 6mm and Width(Wfi) of rectangular slot 0.7mm.  For 6mm width we get widen bandwidth.

INSET L-SHAPED WITH SLOT ON GROUND PLANE  For ground plane, fix the length(WL) to 12mm and vary width(HL) to 2mm, 4mm, 6mm.  2mm width is selected (For Optimum Matching)

INSET L-SHAPED WITH C-SLOT ON GROUND PLANE  We modify L-Slot to C-Slot on Ground Plane with width(Wc) 28mm and height(Hc) to 2mm, 3mm, 4mm.  2mm height is selected(for optimum matching)

MODIFICATION IN FINAL RESULT

RADIATION PATTERN FOR MICROSTRIP PATCH

ADVANTAGE OF MICROSTRIP PATCH ANTENNA  Low fabrication cost, hence can be manufactured in large quantities  Impedance matching is easy  Capable of dual and triple frequency operations  Mechanically robust when mounted on rigid surfaces  Light weight and low volume.

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