initial commit / add all books

42 files changed, 508 insertions, 0 deletions

diff --git a/3281/CH4/EX4.1/ex4_1.jpg b/3281/CH4/EX4.1/ex4_1.jpg
new file mode 100755
index 000000000..293ed5b96
--- /dev/null
+++ b/3281/CH4/EX4.1/ex4_1.jpg
diff --git a/3281/CH4/EX4.1/ex4_1.sce b/3281/CH4/EX4.1/ex4_1.sce
new file mode 100755
index 000000000..f97a22122
--- /dev/null
+++ b/3281/CH4/EX4.1/ex4_1.sce
@@ -0,0 +1,23 @@
+//Page Number: 193

+//Example 4.1

+clc;

+//Given

+a=5;//cm

+a1=a/100;//m

+b=2;//cm

+b1=b/100;//m

+c=15;//cm

+c1=c/100;//m

+

+//(i) Air filled cavity

+m=1;

+n=0;

+p=1;

+c=3D+8; //for air

+fr=(1/2)*c*sqrt((m/a1)^2+(n/b1)^2+(p/c1)^2); //hz

+disp('Ghz',fr/10^9,'Resonant frequency for an air filled cavity:');

+

+//(ii) Dielctric filled cavity

+er=2.56;

+fr1=(1/2)*(c/sqrt(er))*sqrt((m/a1)^2+(n/b1)^2+(p/c1)^2);//hz

+disp('Ghz',fr1/10^9,'Resonant frequency for dielectric cavity:');

diff --git a/3281/CH4/EX4.10/ex4_10.jpg b/3281/CH4/EX4.10/ex4_10.jpg
new file mode 100755
index 000000000..a4414d560
--- /dev/null
+++ b/3281/CH4/EX4.10/ex4_10.jpg
diff --git a/3281/CH4/EX4.10/ex4_10.sce b/3281/CH4/EX4.10/ex4_10.sce
new file mode 100755
index 000000000..b18ce22d5
--- /dev/null
+++ b/3281/CH4/EX4.10/ex4_10.sce
@@ -0,0 +1,26 @@
+//Page Number: 199

+//Example 4.10

+clc;

+//Given

+a=3;//cm

+a1=a/100;//m

+d=10;//cm

+d1=d/100;//m

+df=2.5D+6;

+er=2.25;

+p11=1.841;

+c=3D+8; //m/s

+

+//Resonant frequency

+fr=(c/2)*(sqrt((p11/a1)^2+(%pi/d1)^2));//hz

+disp('Ghz',fr/10^9,'Resonant frequency:');

+

+//Q without dielectric

+q0=fr/df;

+disp(q0,'Q wirhout dielectric constant:');

+

+// Q with dielectric

+fr1=fr/sqrt(er);

+qd=1D+3;

+q=(q0*qd)/(q0+qd);

+disp(q,'Q with dielectric constant:');

diff --git a/3281/CH4/EX4.11/ex4_11.jpg b/3281/CH4/EX4.11/ex4_11.jpg
new file mode 100755
index 000000000..a565a99e2
--- /dev/null
+++ b/3281/CH4/EX4.11/ex4_11.jpg
diff --git a/3281/CH4/EX4.11/ex4_11.sce b/3281/CH4/EX4.11/ex4_11.sce
new file mode 100755
index 000000000..8f81bfdd7
--- /dev/null
+++ b/3281/CH4/EX4.11/ex4_11.sce
@@ -0,0 +1,24 @@
+//Page Number: 200

+//Example 4.11

+clc;

+//Given

+f=9.375D+9;//hz

+sig=5.8D+7;

+eet=377;

+c=3D+8; //m/s

+w=2*%pi*f;

+r=1.5;

+u=4D-7*%pi;

+

+//Radius

+a=c/(f*2.62);//m

+disp('cm',a*100,'Radius of resonantor');

+

+//O

+rs=sqrt((w*u)/(2*sig));//ohm

+x=1.202*eet;

+y=rs*(1+(1/r));

+q=x/y;

+disp(q,'Q of the resonator:');

+

+//Answer for Q is calculated as 10875 in book but it is 10763.303

diff --git a/3281/CH4/EX4.12/ex4_12.jpg b/3281/CH4/EX4.12/ex4_12.jpg
new file mode 100644
index 000000000..04396bc04
--- /dev/null
+++ b/3281/CH4/EX4.12/ex4_12.jpg
diff --git a/3281/CH4/EX4.12/ex4_12.sce b/3281/CH4/EX4.12/ex4_12.sce
new file mode 100644
index 000000000..3e0a3abe1
--- /dev/null
+++ b/3281/CH4/EX4.12/ex4_12.sce
@@ -0,0 +1,33 @@
+//Page Number: 215

+//Example 4.12

+clc;

+//Given

+f=5D+9;//hz

+sig=5.813D+7;

+er=2.25;

+tandel=4D-4;

+c=3D+8; //m/s

+h01=3.832;

+u=4D-7*%pi;

+

+//Length of resonator

+lamr=c/(f*sqrt(er));

+d=sqrt([{(((2*3.832)^2)+(%pi*%pi))*(lamr*lamr)}/(2*2*%pi*%pi)]);

+disp('cm',d*100,'Length of resonator:');

+

+//Q of resonator

+n=(120*%pi)/sqrt(er);

+Rs=sqrt((f*u)/sig);

+a=d/2;

+Qw1=n*[[(h01/a)^2+(%pi/d)^2]^(3/2)];

+Qw2=2*Rs*[((h01*h01)/(a*a*a))+((2*%pi*%pi)/(d*d*d))];

+Qw=Qw1/Qw2;

+Qd=1/tandel;

+Q=(Qw*Qd)/(Qw+Qd);

+disp(Q,'Q of resonator:');

+

+//Value of Qw is calculated wrong in the book, it should be 50057.91 instead of 53473.8

+//Hence the value of Q also differs

+

+

+

diff --git a/3281/CH4/EX4.13/ex4_13.jpg b/3281/CH4/EX4.13/ex4_13.jpg
new file mode 100755
index 000000000..dc7c1df41
--- /dev/null
+++ b/3281/CH4/EX4.13/ex4_13.jpg
diff --git a/3281/CH4/EX4.13/ex4_13.sce b/3281/CH4/EX4.13/ex4_13.sce
new file mode 100755
index 000000000..77b829fa7
--- /dev/null
+++ b/3281/CH4/EX4.13/ex4_13.sce
@@ -0,0 +1,22 @@
+//Page Number: 215

+//Example 4.13

+clc;

+//Given

+p=100; //mW

+//As 2 and 3 are matched terminals

+x=1/2;

+y=1/sqrt(2);

+s=[x -x y;-x 0 y;y y 0];

+

+//Power delivered

+//Port 1

+p1=p*(1-s(1,1)^2);

+disp('mW',p1,'Power at port 1:');

+

+//Port2

+p2=p*s(2,1)^2;

+disp('mW',p2,'Power at port 2:');

+

+//Port 3

+p3=p*s(3,1)^2;

+disp('mW',p3,'Power at port 3:');

diff --git a/3281/CH4/EX4.14/ex4_14.jpg b/3281/CH4/EX4.14/ex4_14.jpg
new file mode 100755
index 000000000..042cf5762
--- /dev/null
+++ b/3281/CH4/EX4.14/ex4_14.jpg
diff --git a/3281/CH4/EX4.14/ex4_14.sce b/3281/CH4/EX4.14/ex4_14.sce
new file mode 100755
index 000000000..56fff5833
--- /dev/null
+++ b/3281/CH4/EX4.14/ex4_14.sce
@@ -0,0 +1,27 @@
+//Page Number: 216

+//Example 4.14

+clc;

+//Given

+p=40; //mW

+//Since port 3 is matched

+x=sqrt(2);

+s=[1 1 x;1 1 -x;x -x 0];

+r1=40; //ohm

+r2=60; //ohm

+w=50; //ohm

+

+//Reflection coefficients

+T1=(w-r1)/(w+r1);

+T2=(r2-w)/(r2+w);

+

+//As power is fed into 1 and 2 equally

+pd=p/2;

+

+//Power delivered

+//Port 1

+p1=pd*(1-T1^2);

+disp('mW',p1,'Power at port 1:');

+

+//Port2

+p2=pd*(1-T2^2);

+disp('mW',p2,'Power at port 2:');

diff --git a/3281/CH4/EX4.15/ex4_15.jpg b/3281/CH4/EX4.15/ex4_15.jpg
new file mode 100755
index 000000000..abb7b1c69
--- /dev/null
+++ b/3281/CH4/EX4.15/ex4_15.jpg
diff --git a/3281/CH4/EX4.15/ex4_15.sce b/3281/CH4/EX4.15/ex4_15.sce
new file mode 100755
index 000000000..a3823899f
--- /dev/null
+++ b/3281/CH4/EX4.15/ex4_15.sce
@@ -0,0 +1,39 @@
+//Page Number: 216

+//Example 4.15

+clc;

+//Given

+T1=1/2;

+T2=3/5;

+T3=0;

+T4=4/5;

+p=500D-3; //W

+//S matrix for magic Tee

+x=1/sqrt(2);

+s=[0 0 x x;0 0 x -x;x x 0 0;x -x 0 0];

+//Using the input output relation

+//[b]=[s]*[a]

+b=[0.6565;0.7576;0.5536;0.0892];

+

+//(i) Power transmitted through ports

+//Port 1

+p1=(1/2)*b(1,1)^2*(1-T1^2);

+disp('W',p1,'Power at port 1:');

+

+//Port2

+p2=(1/2)*(b(2,1)^2)*(1-(T2^2));

+disp('W',p2,'Power at port 2:');

+

+//Port 4

+p4=(1/2)*b(4,1)^2*(1-T4^2);

+disp('W',p4,'Power at port 4:');

+

+//(ii) Power reflected at port 3

+//Port 3

+p3=p*b(3,1)^2;

+disp('W',p3,'Power at port 3:');

+

+//(iii) Power absorbed

+pabs=p-(p1+p2+p3+p4);

+disp('W',pabs,'Power absorbed:');

+

+//Answer for power absorbed is calculated wrong in book

diff --git a/3281/CH4/EX4.18/ex4_18.jpg b/3281/CH4/EX4.18/ex4_18.jpg
new file mode 100755
index 000000000..e78a3b06b
--- /dev/null
+++ b/3281/CH4/EX4.18/ex4_18.jpg
diff --git a/3281/CH4/EX4.18/ex4_18.sce b/3281/CH4/EX4.18/ex4_18.sce
new file mode 100755
index 000000000..4aee6c2a4
--- /dev/null
+++ b/3281/CH4/EX4.18/ex4_18.sce
@@ -0,0 +1,15 @@
+//Page Number: 236

+//Example 4.18

+clc;

+//Given

+C=10; //dB

+D=30; //dB

+

+//Parameters

+bet=10^(-C/20);

+x=bet/(10^(D/20));

+a=sqrt(1-(bet*bet));

+//Scattering matrix

+//Assuming symmetery

+s=[0 a x (bet*%i);a 0 (bet*%i) x;x (bet*%i) 0 a;(bet*%i) x a 0];

+disp(s,'Scattering matrix:');

diff --git a/3281/CH4/EX4.2/ex4_2.jpg b/3281/CH4/EX4.2/ex4_2.jpg
new file mode 100755
index 000000000..6f2035d66
--- /dev/null
+++ b/3281/CH4/EX4.2/ex4_2.jpg
diff --git a/3281/CH4/EX4.2/ex4_2.sce b/3281/CH4/EX4.2/ex4_2.sce
new file mode 100755
index 000000000..2e1080000
--- /dev/null
+++ b/3281/CH4/EX4.2/ex4_2.sce
@@ -0,0 +1,17 @@
+//Page Number: 193

+//Example 4.2

+clc;

+//Given

+a=0.38;//cm

+a1=a/100;//m

+b=0.76;//cm

+b1=b/100;//m

+f=50D+9;

+c=3D+8;

+

+//Length for TE102

+m=1;

+n=0;

+p=2;

+l=1/sqrt((f/c)^2-(1/(4*b1^2)));//m

+disp('cm',l*100,'Length c:');

diff --git a/3281/CH4/EX4.20/ex4_20.jpg b/3281/CH4/EX4.20/ex4_20.jpg
new file mode 100755
index 000000000..b5ce9fea9
--- /dev/null
+++ b/3281/CH4/EX4.20/ex4_20.jpg
diff --git a/3281/CH4/EX4.20/ex4_20.sce b/3281/CH4/EX4.20/ex4_20.sce
new file mode 100755
index 000000000..b7c86994b
--- /dev/null
+++ b/3281/CH4/EX4.20/ex4_20.sce
@@ -0,0 +1,24 @@
+//Page Number: 238

+//Example 4.20

+clc;

+//Given

+vswr=2;

+D1=8; //mW

+D2=2; //mW

+

+//Reflection coefficient at arm 4

+T=(vswr-1)/(vswr+1);

+//Powwe delivered to D1

+P=(D1*100)/(1-T^2);

+P1=0.99*P;

+//Power reflected at D1

+W1=(P/100)*T*T;

+//Power reflected at load

+W2=D2-W1;

+Tt=sqrt((W2*100)/(P1));

+pt=(1+Tt)/(1-Tt);

+disp(pt,'VSWR:');

+Pl=P1*(1-(Tt*Tt));

+disp('mW',Pl,'Power delivered:');

+

+//Answer for P1 should be 792 but it is given as 800

diff --git a/3281/CH4/EX4.21/ex4_21.jpg b/3281/CH4/EX4.21/ex4_21.jpg
new file mode 100644
index 000000000..c84fb8fa6
--- /dev/null
+++ b/3281/CH4/EX4.21/ex4_21.jpg
diff --git a/3281/CH4/EX4.21/ex4_21.sce b/3281/CH4/EX4.21/ex4_21.sce
new file mode 100644
index 000000000..ae9dafb68
--- /dev/null
+++ b/3281/CH4/EX4.21/ex4_21.sce
@@ -0,0 +1,11 @@
+//Page Number: 239

+//Example 4.21

+clc;

+//Given

+I=30; //dB

+Il=0.4; //dB

+

+S12=10^(I/-20);

+S21=10^(Il/-20);

+s=[0 S12;S21 0];

+disp(s,'Scattering matrix:');

diff --git a/3281/CH4/EX4.22/ex4_22.jpg b/3281/CH4/EX4.22/ex4_22.jpg
new file mode 100755
index 000000000..dcf784f9d
--- /dev/null
+++ b/3281/CH4/EX4.22/ex4_22.jpg
diff --git a/3281/CH4/EX4.22/ex4_22.sce b/3281/CH4/EX4.22/ex4_22.sce
new file mode 100755
index 000000000..c4c6e615f
--- /dev/null
+++ b/3281/CH4/EX4.22/ex4_22.sce
@@ -0,0 +1,21 @@
+//Page Number: 240

+//Example 4.22

+clc;

+//Given

+I=30; //dB

+Il=2; //dB

+p=1.3;

+

+//Elelments

+T=(p-1)/(p+1);

+S11=T;

+S22=T;

+S33=T;

+S12=10^(-Il/20);

+S13=10^(-I/20);

+S21=S13;

+S32=S13;

+S23=S12;

+S31=S23;

+s=[S11 S21 S31;S12 S22 S32;S13 S23 S33];

+disp(s,'Scattering matrix:');

diff --git a/3281/CH4/EX4.23/ex4_23.jpg b/3281/CH4/EX4.23/ex4_23.jpg
new file mode 100755
index 000000000..d0bbd40b4
--- /dev/null
+++ b/3281/CH4/EX4.23/ex4_23.jpg
diff --git a/3281/CH4/EX4.23/ex4_23.sce b/3281/CH4/EX4.23/ex4_23.sce
new file mode 100755
index 000000000..de1da3c76
--- /dev/null
+++ b/3281/CH4/EX4.23/ex4_23.sce
@@ -0,0 +1,21 @@
+//Page Number: 249

+//Example 4.23

+clc;

+//Given

+f=10D+9; //Hz

+u=4D-7*%pi;

+c=3D+8; //m/s

+a=2.29; //cm

+a1=a/100;

+b=1.02; //cm

+b1=b/100;

+

+//E/H

+w=2*%pi*f;

+EbyH=(w*u)/sqrt(((w/c)^2)+((%pi/a1)^2));

+lam=c/f;

+lamc=2*a1;

+d=(1/4)*(lam/sqrt(1-((lam/lamc)^2)));

+disp('cm',d*100,'Position:');

+

+//Answer for positon is calculated wrong in book

diff --git a/3281/CH4/EX4.24/ex4_24.jpg b/3281/CH4/EX4.24/ex4_24.jpg
new file mode 100755
index 000000000..0b9bf4649
--- /dev/null
+++ b/3281/CH4/EX4.24/ex4_24.jpg
diff --git a/3281/CH4/EX4.24/ex4_24.sce b/3281/CH4/EX4.24/ex4_24.sce
new file mode 100755
index 000000000..5e2bf5426
--- /dev/null
+++ b/3281/CH4/EX4.24/ex4_24.sce
@@ -0,0 +1,9 @@
+//Page Number: 250

+//Example 4.24

+clc;

+//Given

+//As it is perfectly matched

+S12=1/sqrt(2);

+S21=S12;

+s=[0 S12;S21 0];

+disp(s,'Scattering matrix:');

diff --git a/3281/CH4/EX4.3/ex4_3.jpg b/3281/CH4/EX4.3/ex4_3.jpg
new file mode 100755
index 000000000..84cf92efb
--- /dev/null
+++ b/3281/CH4/EX4.3/ex4_3.jpg
diff --git a/3281/CH4/EX4.3/ex4_3.sce b/3281/CH4/EX4.3/ex4_3.sce
new file mode 100755
index 000000000..0a84ccc69
--- /dev/null
+++ b/3281/CH4/EX4.3/ex4_3.sce
@@ -0,0 +1,29 @@
+//Page Number: 194

+//Example 4.3

+clc;

+//Given

+c=3D+8; //m/s

+a=2.286;//cm

+a1=a/100;//m

+b=1.024;//cm

+b1=b/100;//m

+f=10D+9;//hz

+sig=6D+7;

+u=4D-7*%pi;

+w=2*%pi*f;

+eet=377;

+

+//Shortest cavity length

+lamc=2*a1;//m

+fc=c/lamc;//hz

+lam=c/f;//m

+lamg=lam/sqrt(1-(fc/f)^2);//m

+sc=lamg/2;//m

+disp('cm',sc*100,'Shortest cavity length:');

+

+//Qw of the resonator operating in TE101 mode

+rs=sqrt((w*u)/(2*sig));//ohm

+lamr=c/f;

+x=(((a1*b1)/(sc^2))+((sc^2+a1^2)/(2*sc*a1))+(b1*sc/a1^2));

+qw=(2*%pi*eet*a1*b1*sc)/(rs*(lamr^3)*x);

+disp(qw,'Qw of the resonator operating in TE101 mode');

diff --git a/3281/CH4/EX4.4/ex4_4.jpg b/3281/CH4/EX4.4/ex4_4.jpg
new file mode 100755
index 000000000..936acc9cf
--- /dev/null
+++ b/3281/CH4/EX4.4/ex4_4.jpg
diff --git a/3281/CH4/EX4.4/ex4_4.sce b/3281/CH4/EX4.4/ex4_4.sce
new file mode 100755
index 000000000..501457034
--- /dev/null
+++ b/3281/CH4/EX4.4/ex4_4.sce
@@ -0,0 +1,39 @@
+//Page Number: 195

+//Example 4.4

+clc;

+//Given

+c=3D+8; //m/s

+a=4.8;//cm

+a1=a/100;//m

+b=2.2;//cm

+b1=b/100;//m

+f=5D+9;//hz

+er=2.25;

+tandel=4D-4;

+sig=5.813D+7;

+oneby=3D+8;

+u=4D-7*%pi;

+w=2*%pi*f;

+eet=377;

+

+//Length at p=1

+m=1;

+n=0;

+p=1;

+z=(f*2*sqrt(er))/c;

+cp1=p/sqrt((z^2)-((m/a1)^2)-((n/b1)^2));

+disp('cm',cp1*100,'Length of resonator at p=1:');

+

+//At p=2

+cp2=cp1*2;

+disp('cm',cp2*100,'Length of resonator at p=2:');

+

+//Qw

+rs=sqrt((w*u)/(2*sig));//ohm

+lamr=c/(f*sqrt(er));

+x=(((a1*b1)/(cp1^2))+((cp1^2+a1^2)/(2*cp1*a1))+(b1*cp1/a1^2));

+qw=(2*%pi*(eet/sqrt(er))*a1*b1*cp1)/(rs*(lamr^3)*x);

+qd=1/tandel;

+q=(qw*qd)/(qw+qd);

+disp(q,'Q for TE101 mode:');

+

diff --git a/3281/CH4/EX4.5/ex4_5.jpg b/3281/CH4/EX4.5/ex4_5.jpg
new file mode 100755
index 000000000..e4a6a2ded
--- /dev/null
+++ b/3281/CH4/EX4.5/ex4_5.jpg
diff --git a/3281/CH4/EX4.5/ex4_5.sce b/3281/CH4/EX4.5/ex4_5.sce
new file mode 100755
index 000000000..72083e89e
--- /dev/null
+++ b/3281/CH4/EX4.5/ex4_5.sce
@@ -0,0 +1,37 @@
+//Page Number: 196

+//Example 4.5

+clc;

+//Given

+c=3D+8; //m/s

+a=2;//cm

+a1=a/100;//m

+b=2.5;//cm

+b1=b/100;//m

+

+disp('TE modes');

+h01=3.832;

+fr=(c/(2*%pi))*sqrt((h01/a1)^2+(%pi/b1)^2);//hz

+disp('Ghz',fr/10^9,'Resonant frequency for mode TE010:');

+

+h11=1.841;

+fr1=(c/(2*%pi))*sqrt((h11/a1)^2+(%pi/b1)^2);//hz

+disp('Ghz',fr1/10^9,'Resonant frequency for mode TE111:');

+

+h21=3.054;

+fr2=(c/(2*%pi))*sqrt((h21/a1)^2+(%pi/b1)^2);//hz

+disp('Ghz',fr2/10^9,'Resonant frequency for mode TE211:');

+

+disp('TM modes:');

+l1=0;

+h011=2.405;

+fr3=(c/(2*%pi))*sqrt((h011/a1)^2+(%pi*l1/b1)^2);//hz

+disp('Ghz',fr3/10^9,'Resonant frequency for mode TM010');

+

+l2=1;

+fr4=(c/(2*%pi))*sqrt((h011/a1)^2+(%pi*l2/b1)^2);//hz

+disp('Ghz',fr4/10^9,'resonant frequency for mode TM011:');

+

+l3=1;

+h111=3.832;

+fr5=(c/(2*%pi))*sqrt((h111/a1)^2+(%pi*l3/b1)^2);//hz

+disp('Ghz',fr5/10^9,'Resonant frequency for mode TM111:');

diff --git a/3281/CH4/EX4.6/ex4_6.jpg b/3281/CH4/EX4.6/ex4_6.jpg
new file mode 100755
index 000000000..2ac183d85
--- /dev/null
+++ b/3281/CH4/EX4.6/ex4_6.jpg
diff --git a/3281/CH4/EX4.6/ex4_6.sce b/3281/CH4/EX4.6/ex4_6.sce
new file mode 100755
index 000000000..ddc7aa1c5
--- /dev/null
+++ b/3281/CH4/EX4.6/ex4_6.sce
@@ -0,0 +1,9 @@
+//Page Number: 196

+//Example 4.6

+clc;

+//Given

+QTM010=1.202;

+QTE101=1.11;

+

+r=QTM010/QTE101;

+disp(r,'Ratio of Qs of cylindrical and rectangular resonators:');

diff --git a/3281/CH4/EX4.7/ex4_7.jpg b/3281/CH4/EX4.7/ex4_7.jpg
new file mode 100755
index 000000000..762a00460
--- /dev/null
+++ b/3281/CH4/EX4.7/ex4_7.jpg
diff --git a/3281/CH4/EX4.7/ex4_7.sce b/3281/CH4/EX4.7/ex4_7.sce
new file mode 100755
index 000000000..23cd817e3
--- /dev/null
+++ b/3281/CH4/EX4.7/ex4_7.sce
@@ -0,0 +1,21 @@
+//Page Number: 197

+//Example 4.7

+clc;

+//Given

+f=7.07D+9;//hz

+a=3;//cm

+a1=a/100;//m

+sig=5.8D+7;

+er=2.25;

+tandel=4D-4;

+ur=1;

+n=377;

+w=2*%pi*f;

+u=4D-7*%pi;

+

+//Q of resonantor

+rs=sqrt(w*u/(2*sig));//ohm

+qw=(0.7419*n)/(rs*sqrt(2.25));

+qd=1/tandel;

+q=(qw*qd)/(qw+qd);

+disp(q,'Q of resonator:');

diff --git a/3281/CH4/EX4.8/ex4_8.jpg b/3281/CH4/EX4.8/ex4_8.jpg
new file mode 100755
index 000000000..e291cc677
--- /dev/null
+++ b/3281/CH4/EX4.8/ex4_8.jpg
diff --git a/3281/CH4/EX4.8/ex4_8.sce b/3281/CH4/EX4.8/ex4_8.sce
new file mode 100755
index 000000000..f32a729c2
--- /dev/null
+++ b/3281/CH4/EX4.8/ex4_8.sce
@@ -0,0 +1,39 @@
+//Page Number: 198

+//Example 4.8

+clc;

+//Given

+a=5;//cm

+a1=a/100;//m

+b=4;//cm

+b1=b/100;//m

+c=10;//cm

+c1=c/100;//m

+sig=5.8D+7;

+u0=4D-7*%pi;

+er=3;

+eet=377;

+

+ur=1;

+spl=3D+8;

+tandel=2.5D-4;

+

+//TE101 mode

+m=1;

+n=0;

+p=1;

+fr=(spl/(2*sqrt(er*ur)))*sqrt((m/a1)^2+(n/b1)^2+(p/c1)^2);//hz

+disp('Ghz',fr/10^9,'Resonant frequency:');

+

+w=2*%pi*fr;

+rs=sqrt((w*u0)/(2*sig));//ohm

+lamr=spl/(fr*sqrt(er));

+x=(((a1*b1)/(c1^2))+((c1^2+a1^2)/(2*c1*a1))+((b1*c1)/a1^2));

+qw=(2*%pi*(eet/sqrt(er))*a1*b1*c1)/(rs*(lamr^3)*x);

+disp(qw,'Q for TE101 mode:');

+

+qd=1/tandel;

+q=(qw*qd)/(qw+qd);

+disp(q,'Q for lossy dielectric:');

+

+//Value of qw is calculated wrong in book as lamr comes to be 0.08 not 0.89 m

+

diff --git a/3281/CH4/EX4.9/ex4_9.jpg b/3281/CH4/EX4.9/ex4_9.jpg
new file mode 100755
index 000000000..ffe77846a
--- /dev/null
+++ b/3281/CH4/EX4.9/ex4_9.jpg
diff --git a/3281/CH4/EX4.9/ex4_9.sce b/3281/CH4/EX4.9/ex4_9.sce
new file mode 100755
index 000000000..cc5d10a64
--- /dev/null
+++ b/3281/CH4/EX4.9/ex4_9.sce
@@ -0,0 +1,22 @@
+//Page Number: 198

+//Example 4.9

+clc;

+//Given

+c=3D+8; //m/s

+a=2.286;//cm

+a1=a/100;//m

+b=1.106;//cm

+b1=b/100;//m

+

+//For fr1=9.3D+9;

+fr1=9.3D+9;//hz

+lamr1=c/fr1;//m

+c1=(2*a1)/sqrt((((2*a1)/lamr1)^2)-1);

+

+//For fr2=10.2D+9;

+fr2=10.2D+9;//hz

+lamr2=c/fr2;//m

+c2=(2*a1)/sqrt((((2*a1)/lamr2)^2)-1);

+

+r=c1-c2;

+disp('cm',r*100,'Range of piston movement:');