In the antenna radiation pattern shown in Figure E9-1, what is the 3 dB beam-width?
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 may occur when a directional antenna is operated at different frequencies within the band for which it was designed?
What type of antenna pattern over real ground 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 an isotropic antenna, assuming each is driven by the same amount of power?
How can the approximate beam-width in a given plane of a directional antenna be determined?
What type of computer program technique is commonly used for modeling antennas?
What is the principle of a Method of Moments analysis?
What is a disadvantage of decreasing the number of wire segments in an antenna model below the guideline of 10 segments per half-wavelength?
What is the far field of an antenna?
What does the abbreviation NEC stand for when applied to antenna modeling programs?
What type of information can be obtained by submitting the details of a proposed new antenna to a modeling program?
What is the front-to-back ratio of the radiation pattern shown in Figure E9-2?
How many elevation lobes appear in the forward direction of the antenna radiation pattern shown in Figure E9-2?