T-Lines
What are the three types of dual conductor T-Lines?
What are:
Twin-Lead
Coax
Microstrip
?
A fluctuating WHAT is used to generate an EM wave in an antenna
Dipole (electron and proton)
What are the pros of an Optical Cable vs a Coaxial Cables
Optical Cable Pros:
Larger Bandwidth
Way Faster Speed
Better noise/external field immunity
Smaller
Better transmission distance
What is a waveguide?
In this class: a structure that doesn't support TEM-modes
What is a steradian?
The surface area of a sphere equal to r^2
The 4 Distributed Parameters in the Distributed Parameter Model(two series and two shunt)
R' (Resistance Per Meter)
L' (Inductance Per Meter)
G' (Conductance Per Meter)
C' (Capacitance Per Meter)
What is a Resonant Frequency and how does it affect antennas?
If the frequency is not resonant, then the signal is transmitted at the wrong time and can cause interferance.
Coaxial Cable Pros vs Optical Cable
Coaxial Cable Pros:
Cheaper
Easy Installation
Can be bent without disrupting signal
Higher durability
Benefits of a Rectangular Waveguide?
Easier math, simple to fabricate, less attenuation than coax cables, suffer from dispersion, frequency limited
What is the numerical aperture of an optical fiber
A description of the acceptance angle of the optical fiber, 0 means that light must enter at a very small angle, 1 means light can enter at larger angles.
What is the Propagation Constant of a Time-harmonic Wave?
Gamma:
sqrt((R'+jwL')*(G'+jwC') = alpha + jBeta
Add more antennas (Yagi Antennas)
Make the antenna bigger (changes the resonant frequency)
Describe the characteristics of an Optical Fiber
Fiber core encased by a fiber cladding, the cladding has a lower refractive index than the core. There is a jacked which surrounds all of the fiber to protect it.
Benefits of a Circular Waveguide
Higher power capability, better with frequency.
Creating a Power budget
and a Rise time budget
What is the only way covered in this course to match impedance?
(There's only one method, but the concept was talked about before this was covered)
Quarter Wave Transformer
What is the difference between an Isotropic and Directional Antenna
Hint Pn(theta, phi) = ?
Isotropic Pn = 1. So there is no directionality and the signal is sent equally in every direction. Directional Antenna is not this way.
Describe a graded index fiber
Looks like a nipple
What is the dominant mode of a waveguide?
The lowest order mode, or TE10
What is Bit Error and Bit Error Ratio (in terms of sending signals)
Bit error ratio loss is the minimum acceptable bit errors thats been previously established.
Why do we use a Quasi-Homogeneous Medium for Microstrip problems
Straighten the E-Field Lines out, we also use Semiempirical (found through theory and through experimentation.)
What is Directivity?
Directivity is how well power is fed into the main lobe of transmission.
What are the 3 types of Signal Degredation
Intermodal Dispersion
Chromatic Dispersion
Attenuation
What is waveguide impedance?
The ration of transverse electric and magnetic fields. Also referred to as transverse wave impedance.
What is a wavefront scheme
See slides
Bold lines represent the wave maxima
the thin lines represent the wave minima