International Research Journal of Engineering and Technology (IRJET) Volume: 04 Issue: 02 | Feb -2017
e-ISSN: 2395 -0056
www.irjet.net
p-ISSN: 2395-0072
EFFECTS OF SLOTS ON MICROSTRIP PATCH ANTENNA NEHA GUPTA M.TECH STUDENT ,ELECTRONICS AND COMMUNICATION , INVERTIS UNIVERSITY , BAREILLY, INDIA ---------------------------------------------------------------------***-----------------------------------------------------------------------ABSTRACT: Antenna ia backbone of communication system with the advent of technology a lot of innovation happens to develop the antenna. Antenna is a smart device which not only transmit and receive but also work as a transducers. This paper presents effect of slots on microstrip patch antenna and its parameters. The effect is shown on bandwidth, gain, radiation pattern, return loss, axial ratio and size of an antenna. The slots on the patch or on the ground plane will help to design a antenna with improved bandwidth and effeciency. Key words: microstrip patch antenna, slots, bandwidth, gain, efficiency. 1.INTRODUCTION Microstrip slot antennas invented in 1938 by Alan Blumlein. Slot radiator or slot antennas are antenna that are used in frequency range from about 300 mhz to 25 ghz. They are often used in navigation radar usually as an array fed by a waveguide. With ever increasing demand for reliable wireless communication, the need for efficient use of electromagnetic spectrum is on the rise. But also older large phased array antenna used the principle because the slot radiators are very inexpensive way for frequency scaning array. The slot behaves according to Babinet’s principle as resonant radiator. Jacques Babinet (1794-1872) was a French physicist and mathematician, formulated the theorem that similar diffraction patterns are produced by two complementary screens .This principle relates the radiated field and impedance of an aperture or slot antenna so that of the field of a dipole antenna.It can also provide the low profile, low cost, small size, easier integration with other circuits and conformability to a shaped surface. Nowsday numerous slot antenna design for 2.4/5 ghz dual band WLAN operations have been reported. Slots antenna are an about λ/2 elongated slot, cut in a conductive plate and exicted in the center. Microstrip slot antenna is simple in structure. It consist of microstrip feed that couples electromagnetic waves through the slot above and slot radiates them. A microstrip fed antenna offers a better isolations between the feed and the material under measurement campared to the microstrip fed microstrip antenna. They are more flexible in integration with other active and passive device in a hybrid MIC and MMIC design. Furthermore they are capable of producing omnidirectional radiation patterns by simply inserting quarter wave thick foam and reflector. We find the great use of slot antennas for fixed stations satellite ground stations and becon with proper mounting a slot antenna can also be used in microwave mobile.
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