morning myself Shrikant rao escape mr.
professor in the department of
electronics and communication
engineering become the cause of indian
technology who taught today in the
advanced communication lab we will study
characteristic of being resonator
mr. English later to say that English is
the construction is micro sublime the
micro supply the construction by Friday
basic directive material above inch the
conducting strip is filled placed the
fighting the construction of actual ring
resonator
there will be one directory grey color
and they say conducting strip so this
conducting state has some wind and some
- or some thickness or that I am
representing here
oh hi dolly or thickness of the
conductance rip dielectric substrate
conducting sip of it W now what had to
do him this experiment is to calculate
what do you think that a concept of the
dreamy resonator so for that what we
need is a microwave host a variable
microwave sauce which are independent
from two point two to three we guard and
a VSWR meter whatever is is switch on my
source as I switch on there are certain
initial procedure to be followed for
this first in chiapas injuries might RF
should be RF power level knob so this is
the RF power level knob should be always
at minimum position and I can choose
either amplitude
relation or frequency modulation and RS
should be on this is the basic
requirement for switching the microwave
source
so next Patel is from the source from
the source which is renovated written
exactly connected to via that we are
metered in the wheels of your meter I
can out two choices I can select either
input one or I can select input two for
in this experiment and selecting input
one from the base of the emitter we can
see that it was not my select channel is
one input one and all my measurement is
normal
next what is a link with my RF power
level by increases and I can see the
difference I am getting the deflection
on the deflection is my range no or the
range DB not it is in 30 DB deflection
is somewhere around three so that means
my reference power it is 30 3 dB
reference for aesthetically B and my
frequencies 2.0 - giggles so next what I
do is I start increasing my frequency
say around two point one my reference
for is somewhere around thirty thirty
three point five two point to around
thirty five two point three weekend
around thirty five two point four thirty
four point five two point five thirty
four
2.6 became some 34
two point seven thirty three point two
two point eight against in thirty four
point one two point nine thirty four
point five three giggles so at 3 giggles
my reference power is thirty forty me
now you can see the difference I started
frequency from two point two I went on
till 3p3 giggles my all reading is
around thirty fourth I Phi DV so that
means there is a minimum at a nation
happening from the source to the VSWR
meter so next what I do is correct
firing the senator
my connect my English later and see the
defense my range knob was in 30
reflection it was somewhere around 33 34
35 when I connect my ring resonator the
deflection it went beyond 10 so that
means my reading is not on my reference
power is some 30 30 pressed and 1440
pressed you go to next range again 40 if
your 1050 plus begin I will go to next
I go to an exchange 50 begins beyond 10
from 60 plus getting reading around 60
reading now raising norm is in 16 the
deflection is somewhere around 60 around
5 so that means 65 now what has happened
is after connecting this or after
connecting my originated a high
attenuation has taken place why because
my reference it was around 33 now I am
getting the reading around 65 or 66 so
that means around 30 DB attenuation has
taken place what I do is again I start
frequencies from 2.2
and I'll not have all my TV level two
point one or two today's sixty eight
point one around 67
the point to ended on 67 to point three
in a row 67 2.4 it's this 657
two point five
4.5 is around 55
2.6 gain some 67
2.7
sixty-eight 2.8 in around 50k 2.9 it is
ste 4.2 3 verse 68 what I can observe
here is except one thing pulsing so that
is 2 point 5 at all the other frequency
there is high attenuation happening at
2.5 for 2.5 the attenuation is minimum
it is around 55 so that means at this
frequency this resonance happening so
what happens in the resonance is
attenuation is minimum by taking plot of
frequency versus attenuation at one
frequency around 2.5 gigahertz there is
minimum intonation and at all the other
frequency there is high attenuation
so this we can observe from base table
mid meter reading so at 2.5 my
attenuation is 55 on my reference power
it is 55 all the other frequencies it is
around 68 69 what I have to do here is
add a note on this frequency so this
frequency why because this
frequency while not on this frequency f
R has 2.5 gigahertz so next what I do is
and use equation 2 pi R equal to n into
V naught divided by F R into square root
of effective dielectric constant Y
effective dielectric constant because my
construction it is microstrip line when
I excite my microstrip line this
electric field so that will be partially
to have their name to die Africa because
of this there are two direct with medium
coming into picture one will be add
other one is the medium for the actual
dielectric of the material because of
that first what I have to do is to
calculate the effective dielectric
constant from the effective dielectric
constant
I have to calculate the actual dietary
constant of the material so first what I
will calculate effective at actually
constant effectively constant is nothing
but n into V naught divided by 2 PI R
into F R or effective dielectric
constant I will calculate now here n
will be more it is 1 v naught it is the
free space velocity 3 into 10 to the
power 8 meter per second 2 is the
constant by 3.14 R is the radius of the
Ring radius of this ring it is 2 L mm
and substitute this and I'll get
effective Delfy concept effective
dielectric constant will come around to
point a 6 now from the effective
dielectric constant and calculate the
collector
the tactic constant is given by this
equation to into effective traffic
constant plus 1 press 10 HD whatever W
to the power minus half minus 1 4
divided by 1 plus 10 H divided by W to
the power minus half plus 1 so I
substitute all the parameters to into
the effective directly constant the
point a 6 plus 1 plus 10 into H hiding
and H is the height of the substrate
height of the substrate it is 0.76 mm
that is substitute divided by w w the
width of the strip it is 1 point 8 4 mm
one point in 4 mm total power minus half
minus 1 fold you are n by 1 plus n h h
is going 7 6 mm / w ee is 1 point 8 4 mm
so I mean I substituted all the video I
mean all the constant and what I get is
and get the Terry constant of the
material as three point zero 2 so that
is nothing but the talc rate constant of
this great pity