In the antenna radiation pattern shown in Figure E9-1, what is the beamwidth?

In the antenna radiation pattern shown in Figure E9-1, what is the front-to-back ratio?

In the antenna radiation pattern shown in Figure E9-1, what is the front-to-side ratio?

What is the front-to-back ratio of the radiation pattern shown in Figure E9-2?

What type of antenna pattern is shown in Figure E9-2?

What is the elevation angle of peak response in the antenna radiation pattern shown in Figure E9-2?

How does the total amount of radiation emitted by a directional gain antenna compare with the total amount of radiation emitted from a theoretical isotropic antenna, assuming each is driven by the same amount of power?

- The total amount of radiation from the directional antenna is increased by the gain of the antenna
- The total amount of radiation from the directional antenna is stronger by its front-to-back ratio
- They are the same
- The radiation from the isotropic antenna is 2.15 dB stronger than that from the directional antenna

What is the far field of an antenna?

- The region of the ionosphere where radiated power is not refracted
- The region where radiated power dissipates over a specified time period
- The region where radiated field strengths are constant
- The region where the shape of the antenna pattern is independent of distance

What type of computer program technique is commonly used for modeling antennas?

- Graphical analysis
- Method of Moments
- Mutual impedance analysis
- Calculus differentiation with respect to physical properties

What is the principle of a Method of Moments analysis?

- A wire is modeled as a series of segments, each having a uniform value of current
- A wire is modeled as a single sine-wave current generator
- A wire is modeled as a single sine-wave voltage source
- A wire is modeled as a series of segments, each having a distinct value of voltage across it

What is a disadvantage of decreasing the number of wire segments in an antenna model below 10 segments per half-wavelength?