Raj Hakani | Nirma University (original) (raw)

Papers by Raj Hakani

— The Inspection of the closed en relevant for improving security and efficie plants, These speci... more — The Inspection of the closed en relevant for improving security and efficie plants, These specific operation as inspect cleaning etc. are expensive, thus the applica appears to be one of the most attractive solutio Recently, in industry duct and venti and many inspection robots were developed robots put to practical use, but they requ supply. Therefore, a new inspection robot communication system is considered useful complex and long distance closed environmen caused by air duct and ventilation like mechanical damage. This Paper describes the d implementation of inspection robot mounted sensor. In a closed environment, human inspection. So, the main goal was to develop robot which can autonomously navigati environment and measure defect like cracks damage and places of the defects inside close provides useful information through wir maintenance. At user end another Zigbee has b information and use this information for displa Keywords— Crack Detection, Intelligent Sen

In this paper, micro strip patch and slot antenna are describe. We similarly show about the reco... more In this paper, micro strip patch and slot antenna are
describe. We similarly show about the reconfigurable antenna
and their types like frequency, polarization, radiation pattern
and gain. The antenna is capable of the frequency exchanging at ten different frequency between 3.4698 GHz and 6.0878 GHz.
There are design and simulate the microstrip antenna, 1X2 array patch antenna and the 1X2 array patch antenna with PIN Diodes. The outcomes are accomplished distinctive frequencies, gain, bandwidth, directivity.

The Indian regional navigational satellite system (IRNSS) is an autonomous regional satellite nav... more The Indian regional navigational satellite system
(IRNSS) is an autonomous regional satellite navigation system
being developed by the Indian Space Research Organization
(ISRO) which would be under complete control of the Indian
Government. The requirement of such a navigation system is
driven by the fact that access to Global Navigation Satellite
System, GPS is not guaranteed in hostile situations. Design of
IRNSS antenna at user segment is mandatory. The simulated
Microstrip patch antenna operates on the frequency of L5 band
(1176.45 MHz) which is used for positioning services. Its
parameters are enhanced by making 2x8 array with Teflon
substrate, increasing gain, directivity, and efficiency to 17.3dB,
18.1dBi and 95.58% respectively. For fabrication purpose
substrate FR4 substrate can be used for which 10.1dB gain and
15.4dBi directivity is obtained till 2x8 array. Results of
simulation are compared with hardware results using Vector
network analyzer for two models of all array.

Electromagnetic waves is very strong waves which is used for transmission of signals from one pla... more Electromagnetic waves is very strong waves which is used for transmission of signals from one place to
other, to guide these electromagnetic transmission line and waveguide are used. The main concern for the transmission
is the selection of waveguide and its physical structure, material and dimensions. In Convectional Wave guide has more
attenuation loss, return loss and insertion loss due to the presence of the small corner. To obtain desired results different
dielectric material and structures plays the important role in waveguide. In this work an attempt has been made a
design Dielectric Circular waveguide for Ku-Band (12GHz to 18GHz) . This paper analyze the different parameter of
Dielectric Circular waveguide loaded with dielectric material like (Cut off frequency, Return loss, Insertion loss) with
the help of simulation in CST. Compare the parameter like (Return loss and Insertion loss) of Dielectric Circular
waveguide loaded with different dielectric material.

In the presented paper Real time object is tracked from real time video. So, many algorithm are a... more In the presented paper Real time object is tracked from real time video. So, many algorithm are available to track an
image but KLT tracker which is proposed by Kanade, Lucas and Tomasi is widely used for object tracking. To track
an Object in a video that has been selected by the user in the first frame, the user may select a particular region or an
object with a rectangular box in the first frame of the video and that object has to be used as reference object or
image and algorithm will track the object or an image for rest of the video sequence.

A planar inverted-F antenna with a huge bandwidth starting from 817MHz to 11.5 GHz proposed as an... more A planar inverted-F antenna with a huge
bandwidth starting from 817MHz to 11.5 GHz proposed as
an substitute for high concert mobile phones proposed to
cover the major part of the mobile phone frequencies global
as well as the multi wideband frequency range. A prototype
of the antenna was construct and the reflection coefficient
and radiation patterns were measured to display an adequate
radiation performance. Besides, the easy creation without a
matching network or a difficult geometry is an
supplementary attribute that can be reflected in low
invention cost

In this paper, we describe about micro strip patch and slot antenna as well as we also describe a... more In this paper, we describe about micro strip
patch and slot antenna as well as we also describe
about the reconfigurable antenna and their types like
frequency, polarization, radiation pattern and gain.
Reconfigurable antenna can be achieved by switching
element like MEMES, VARACTOR DIODES, and PIN
DIODES. From all this frequency-reconfigurable
antennas is use because of their high reliability to be
applied in multiple applications using a single antenna,
which cans achieve different frequency. For this, we
use different technique like FRSPMA, RDGS and U- slot.

The Global Positioning System (GPS) is a space- based satellite system that provides location and... more The Global Positioning System (GPS) is a space-
based satellite system that provides location and time
information in all weather conditions, anywhere on or near
the Earth maintained by US government. The limitation as
supposed is if GPS system of US fails then in all over the
world system will stop working. India is planned to develop
a satellite based navigation systems known as Indian
Regional Navigational Satellite System (IRNSS) for
positioning applications. The design of IRNSS is meant to
overcome this limitation as it services in Indian region. The
satellites will be placed at a higher geostationary orbit to
have a larger signal footprint and lower number of satellites
to map the region. IRNSS signals will consist of a Special
Positioning Service and a Precision Service. Both will be
carried on L5 (1176.45 MHz) and S band (2492.08 MHz).
As it will be long range communication we need high
frequency signals and high gain receiving antennas are
required. So a planar array of patch antennas can be
designed to enhance the gain and other parameters of
antenna.

In this paper, we can control the Robot using Dual Tone Multi Frequency (DTMF) technology. DTMF t... more In this paper, we can control the Robot using Dual Tone Multi Frequency (DTMF) technology. DTMF technology is most useful technique at present days. It is worked on to methods digital signal processing (DSP). Wireless-control of robots uses RF circuit that has the drawbacks of limited working range and limited control. This DTMF is gives advantage over the RF; it increases the range of working and also gives good results in case of motion and direction of robot using mobile phone through micro controller. This type of wireless communication gives the remote handling operation of Robot using DTMF.

In this technical paper explains how a reliable and an authentic wireless communication could be... more In this technical paper explains how a reliable
and an authentic wireless communication could be easily
developed between a mobile phone and microcontroller using
GSM Technology. This technical paper explains "GSM based
Alphanumeric Scrolling Display System" which can be widely
used for displaying notices in colleges, advertisement in stock
market, public place on digital notice board by sending
messages in form of SMS through mobile. The hardware board
contains PIC 16F877A microcontroller at the heart of the
system. The microcontroller is interfaced with GSM Modem
via MAX232 level convertor. It is used to convert RS232
voltage levels to TTL voltage levels and vice versa. Hardware
also contains a real time clock DS1307 to maintain track of
time. A 16x2 Character LCD display and Alphanumeric panel
is attached to microcontroller for display. Microcontroller
coding will be done using Embedded C and MpLab. Multiple
Users are authorized to update notices on the digital notice
board.