GUIDE TYPE 
TE_{11}MODE CUTOFF [GHz]
 MAXIMUM FREQ. RANGE [GHz]
 ATTENUATION [dB/100mt]
 MAX POWER [W]
 VELOCITY FACTOR


EW 127 A 
7.67 
10.0  13.25 
11.83 
1.24 
0.78 
EW 132 
9.22 
11.0  15.35 
15.84 
0.85 
0.78 
WAVEGUIDE 
A few basic facts about waveguide:
 The "WR" designation stands for "waveguide, rectangular"
 The wide inside dimension in inches is the "xxx" part of WRxxx; ie, WR650 is 6.50 inches, WR90 is 0.90 inches.
 The TE_{10} mode of propagation is the lowest mode that is supported.
 The waveguide width determines the lower cutoff frequency and is equal (ideally) to ½ wavelength of
the lower cutoff frequency.
 The TE_{20}, occurs when the width equals one wavelength of the lower cutoff frequency, and so on for
higher modes.
 The TE_{01} mode occurs when the height equals ½ wavelength of the cutoff frequency, and so on
to higher modes.

HBend 
EBend 
An HBend is bent in the Hard direction (along the long side). This is the direction of
the Hfield in the TE_{10} mode. 
An EBend is bent in the Easy direction (along the short side). This is the direction of
the Efield in the TE_{10} mode. 
RECTANGULAR WAVEGUIDE 
Cutoff frequency 
The lower cutoff frequency (or wavelength) for a particular mode in rectangular
waveguide is determined by the following equations:
(Hz)
(m)

where 
a=
b=
m=
n=
e=
m=

Inside
width
Inside height
Number of ½wavelength variations of fields in the "a" direction
Number of ½wavelength variations of fields in the "b" direction
Permittivity
Permeability 



TE (Transverse Electric) Mode 
The TE_{10} mode is the dominant mode of a rectangular waveguide
with a>b, since it has the lowest attenuation of all modes.
Either m or n can be zero, but not both.
End View (TE_{10})
Side View (TE_{10})
Top View (TE_{10})
____ Electric field lines
_ _ _ Magnetic field lines

TM (Transverse Magnetic) Mode 
For TM modes, m=0 and n=0 are not possible, thus, TM_{11} is the
lowest possible TM mode.
End View (TM_{11})
Side View (TM_{11})
____ Electric field lines
_ _ _ Magnetic field lines

CIRCULAR WAVEGUIDES 

TE (Transverse Electric) Mode 

The lower cutoff frequency (or wavelength)
for a particular TE mode in circular waveguide is determined by the following equation:
(m),
where p'_{mn} is


m 
p'_{m1} 
p'_{m2} 
p'_{m3} 
0 
3.832 
7.016 
10.174 
1 
1.841 
5.331 
8.536 
2 
3.054 
6.706 
9.970 
TM (Transverse Magnetic) Mode 
The lower cutoff frequency (or wavelength) for a particular TM mode
in circular waveguide is determined by the following equation:
(m),
where p_{mn} is

m 
p_{m1} 
p_{m2} 
p_{m3} 
0 
2.405 
5.520 
8.654 
1 
3.832 
7.016 
10.174 
2 
5.135 
8.417 
11.620 

