1. transverse-electric
2. transverse-magnetic
3. longitudinal
4. transverse-electromagnetic
transverse-magnetic
1. the latter are not distributed, like transmission km
2. the former can use stubs and quarter-wave transformers, unlike the latter
3. transmission lin. use the principal mode of propagation, and therefore do not suffer from low-frequency cut-off
4. terms such impedance matching and standing-wave ratio cannot be applied to waveguides.
transmission lin. use the principal mode of propagation, and therefore do not suffer from low-frequency cut-off
1. travel along the broader walls of the guide
2. gatirezirted from the wills but do not travel along them
3. travel through the dielectric without touching the walls
4. travel along all four walls of the waveguide
gatirezirted from the wills but do not travel along them
1. they depend on straight-line propagation which applies microwaves only
2. losses would be too heavy at lower frequencies
3. there are no generators powerful enough to excite them at lower frequencies
4. the would be too bulky at lower frequencies
losses would be too heavy at lower frequencies
1. 2.5 GHz
2. 25 GHz
3. 25 MHz
4. 5 GHz
2.5 GHz
1. 10 cm
2. 3π cm
3. 2π cm
4. 8 cm
2π cm
1. 31.11 mW
2. 31.11W
3. 31.2 kW
4. 31.11 MW
31.2 kW
1. 80 Ω
2. 51.2Ω
3. 125Ω
4. 45Ω
51.2Ω
1. 4
2. 2
3. 1
4. 6
4
1. vpvg=c2
2. vp +vg=c2
3. vp/vg=constant
4. vp+vg=constant
vpvg=c2