The Rhombic antenna uses _____ elements

As antenna gain increases, the antenna radiation pattern becomes more _____

the impedance of a yagi-uda antenna using split dipole is _____ ohms

The spacing between the elements in a yagi-uda antenna is _____ wavelengths 

In a Yagi-uda antenna, the length of the reflector ______ wavelengths

In a Yagi-uda antenna, the length of the director is ______ wavelengths 

In a Yagi-uda antenna, the length of the driven element is _____ wavelength 

In _____ array antenna, the maximum radiation is at the right angles to main axis of antenna

In _____ array antenna, maximum radiation along the main axis of antenna

the input impedance of the Rhombic antenna is ____ ohms 

_____ is visualized to exist below the earth's surface and is a true mirror image of the actual antenna

A grounded quarter-wave vertical radiator effectively has a _____ added to it by its image

The _____ is composed of a series of conductors buried below the surface of the earth and arranged in a radial pattern. These conductors reduce losses in the ground in the immediate vicinity of the antenna

An antenna is said to be current-fed if it is fed at a point of D _____

______ antennas are coupled to their transmitters without transmission lines, generally for lack of space

The voltage and current distributions of the Marconi antenna is similar to ___

A _____ consists of a system of radials, supported aboveground and insulated from it. It is a substitute for a ground screen in areas of low ground conductivity. 

A good method of increasing radiation resistance is to have a horizontal portion at the top of the antenna, this method is called _____

A center-fed half-wave dipole or Marconi antenna is _____

_____ is a network composed of reactances and transformers, which may be lumped or distributed 

_____ is used to prevent the illegal radiation of spurious frequencies from the system as a whole

_____ is used to tune out the reactive component of the antenna impedance, making the impedance appear resistive to the transmitter

______ is the result of pysical antennas having finite thickness, instead of being infinitely thin. In consequence, the propagation velocity within the antenna is some 2 to 8 percent less than in air

Any dipole in an array which are not fed directly are called ____ elements

The ____ is the interface between the transmission line and space

As antenna gain increases antenna radiation patter becomes more ____

_____ means that an antenna radiates RF energy in all directions from antenna

Antenna gain ____ every 3dB

A directional antenna ____ RF energy in one direction

The beamwidth of an antenna radiation pattern is measured between ____ power points

Antennas are _____, which means the same design works for receiving systems as for transmitting systems

In a dipole antenna, the maximum current is at the ____

In a dipole antenna, the maximum voltage is at the _____

____ applies to the field gain of the antenna and the efficiency of the transmitter

Dipole antennas has a radiation pattern shaped like a ____

Antennas are ____ devices, the power radiated cannot be greater than the power entering from the transmitter

In dipole antenna (eg. Hertzian dipole and dipole), the maximum radiation at _____ to the axis of the wire

______ is a comparison of the output power of an antenna in a certain direction that of an isotropic antenna

The ____ of an antenna's radiation, at a given point in space, is equal to the amount of voltage induced in a wire antenna 1m long, located at that given point

The _____ is the ratio of the power radiated by the antenna to the square of the current at the feed point

______ refers to the range of the frequencies the antenna will perform satisfactorily throughout this range of frequencies

Low-frequency antennas (AM station in Milaor) are usually ____ polarized because of ground effect (reflected waves, etc) and physical construction methods

High-frequency antennas like TV and FM are generally ____ polarized

____ is defined as the ratio of the power density in a particular direction of one antenna to the power density that would be radiated by an omnidirectional antenna (isotropic antenna)

The gain of a half wave dipole compared to the isotropic antenna is ___ dB

_____ antennas are likely a properly terminated transmission line, produces no standing waves

Standing waves exist on the ____ antenna, caused by the presence of both a reflected traveling wave and the forward traveling incident wave

Non-resonant antennas are ____

______ is the region of the radiation pattern containing the highest power or exhibiting the greatest field strength

The impedance of a half-wave antenna at the center it feedpoint is approximately ____ ohms

The ____ is a theoretical antenna shorter than a wavelength. It is used as a standard to which all other antenna characteristics can be compared

Antenna radiation pattern depends chiefly on the antenna length measured in ____, its power losses, and the terminations at its end. 

The half-wave antenna has distributed capacitance and inductance and acts like a resonant circuit. The voltage and current will therefore be _____

The longer the antenna, the higher the _____

Nonresonant antennas have higher directive gain than _____ antennas 

The radiation pattern of a one or full wavelength antenna is ____