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Directional variation in strength of radio waves
An antenna radiation pattern (or antenna pattern or far-field pattern) is the directional (angular) dependence of the field strength (sometimes also the
Radiation_pattern
Type of antenna
The radiation-field pattern can be calculated by applying Huygens' principle in a similar way to a rectangular aperture. The electric field pattern can
Parabolic_antenna
Regions of an electromagnetic field
in the medium. Also known as the radiation-zone, the far field carries a relatively uniform wave pattern. The radiation zone is important because far fields
Near_and_far_field
Type of radio antenna
monopole antenna, and like a vertical dipole has an omnidirectional radiation pattern, radiating equal radio power in all azimuthal directions (perpendicular
Whip_antenna
Antenna capable of modifying its frequency and radiation properties dynamically
reconfigurable antenna is an antenna capable of modifying its frequency and radiation pattern dynamically, in a controlled and reversible manner. In order to provide
Reconfigurable_antenna
Type of radio antenna consisting of a loop or coil
at that frequency. Large loop antennas have a two-lobe dipole like radiation pattern at their first, full-wave resonance, peaking in both directions perpendicular
Loop_antenna
Class of radio antenna
invented it at about the same time. Due to their omnidirectional radiation pattern, vertical monopole antennas are commonly used in terrestrial radio
Monopole_antenna
Antenna consisting of two rod-shaped conductors
needed] The dipole is any one of a class of antennas producing a radiation pattern approximating that of an elementary electric dipole with a radiating
Dipole_antenna
Funnel-shaped waveguide radio device
center. The pattern of electric and magnetic fields at the aperture plane at the mouth of the horn, which determines the radiation pattern, is a scaled-up
Horn_antenna
Radio antenna that sends signals in every direction
zero on the axis. When graphed in three dimensions (see graph) this radiation pattern is often described as doughnut-shaped. This is different from an isotropic
Omnidirectional_antenna
Region of the radiation pattern of an antenna
the radiation pattern containing the highest power or exhibiting the greatest field strength. The radiation pattern of most antennas shows a pattern of
Main_lobe
Radio aerial composed of directly-connected and passive elements
electromagnetically with the driven element, and serve to modify the radiation pattern of the antenna, directing the radio waves in one direction, increasing
Driven_and_parasitic_elements
Telecommunications performance metric
called the antenna pattern or radiation pattern. It is not to be confused with directivity, which does not take an antenna's radiation efficiency into account
Gain_(antenna)
Device that transmits and receives radio waves
which serve to direct the radio waves into a beam or other desired radiation pattern. Strong directivity and good transmitting efficiency when transmitting
Antenna_(radio)
Substances which absorb radio frequency energy
resulting level of reflected RF radiation. Many measurements in electromagnetic compatibility (EMC) and antenna radiation patterns require that spurious signals
Radiation-absorbent_material
Array of antennas creating a steerable beam
used to a lesser extent for unsteered array antennas in which the radiation pattern of the antenna array is fixed. For example, AM broadcast radio antennas
Phased_array
Antenna testing techniques
bandwidth, radiation pattern, beamwidth, polarization, and impedance. These parameters are essential for effective communication. The antenna pattern is the
Antenna_measurement
Lobe in a discrete aperture antenna
perceived difference seen in the grating lobes is because of the radiation pattern of non-isotropic antenna elements, which affects main and grating
Grating_lobes
Radio antenna; long wire suspended above the ground
5 m). The radiation pattern of a thin wire antenna is easily predictable using antenna modeling. For a straight wire, the radiation pattern can be described
Random_wire_antenna
Lobes of far field radiation pattern of antenna
field radiation pattern of an antenna or other radiation source, that are not the main lobe. The radiation pattern of most antennas shows a pattern of "lobes"
Sidelobes
Type of radio antenna
modify the driven element's radiation pattern. The waves from the multiple elements superpose and interfere to enhance radiation in a single direction, increasing
Yagi–Uda_antenna
Measurement of ambient electromagnetic field
coordinates (X,Y,Z) is for the probe radiation pattern to be as close as possible to ideal short dipole pattern, called sin θ: f ( θ , ϕ ) = A sin (
EMF_measurement
Antenna constructions for different applications
Halos' radiation pattern is mostly in-plane and nearly omnidirectional, about the same as small loops' radiation pattern. Halos' radiation efficiency
Antenna_types
Electrical device
configuration of the feed cable, and the radiation pattern of small antennas may be distorted by radiation from the cable. Baluns are present in radars
Balun
Changing the direction of the main lobe of a radiation pattern
of the main lobe of a radiation pattern. Beam tilt is used in radio to aim the main lobe of the vertical plane radiation pattern of an antenna below (or
Beam_steering
Electrically conductive surface, usually connected to electrical ground
on the other side of the ground plane. In a monopole antenna, the radiation pattern of the monopole plus the virtual image antenna make it appear as a
Ground_plane
Multi-element, directional antenna useable over a wide band of frequencies
Sigma and tau are the key design elements of the LPDA design. The radiation pattern of the antenna is unidirectional, with the main lobe along the axis
Log-periodic_antenna
Type of radio antenna
antenna radiates vertically polarized radio waves in an omnidirectional radiation pattern, with equal power in all azimuthal directions. The axis of the horizontal
T-antenna
Type of radio frequency antenna
absorbing and reradiating radio waves from the mast, disturbing the radiation pattern of the antenna. To prevent this, additional strain insulators are
Mast_radiator
Type of electrical resistance from an antenna
Radiation resistance is that part of an antenna's feedpoint electrical resistance caused by the emission of radio waves from the antenna. A radio transmitter
Radiation_resistance
Type of antenna used for various communication
size of the slot, as well as the driving frequency, determine the radiation pattern. Slot antennas are usually used at UHF and microwave frequencies at
Slot_antenna
unit cell is minimised, an aperture area appropriate to the feed radiation pattern can efficiently focus the wavefronts from the feed. Transmitarrays
Transmitarray_antenna
Definition of directional radio frequency power
"main lobe") of its radiation pattern. This apparent power is dependent on two factors: the total power output and the radiation pattern of the antenna –
Effective_radiated_power
Monopole antenna
antenna radiates vertically polarised radio waves in an omnidirectional radiation pattern, with equal power emitted in all horizontal directions, with maximum
Umbrella_antenna
Type of antenna
wave vertical and the radiation pattern,[citation needed] similar to these antennas is omnidirectional, with maximum radiation at right angles to the
Helical_antenna
Set of multiple antennas which work together
of phase and when combined in the receiver cancel each other. The radiation pattern of such an antenna consists of a strong beam in one direction, the
Antenna_array
Computer program for antenna modeling
difference is applied at the middle of the wire tagged 1, while the RP (radiation pattern) sets up some specifics of the signal. Finally the EN line (end of
Numerical Electromagnetics Code
Numerical_Electromagnetics_Code
Converts an electrical audio signal into a corresponding sound
Most ribbon tweeters emit sound in a dipole pattern. A few have backings that limit the dipole radiation pattern. Above and below the ends of the more or
Loudspeaker
Optical axis of a directional antenna
boresight is the axis of symmetry of the parabolic dish, and the antenna radiation pattern (the main lobe) is symmetrical about the boresight axis. Most antennas
Antenna_boresight
Loudspeaker using an acoustic horn
coverage (radiation pattern) of the horn is determined by the shape and flare of the mouth. A major problem of horn speakers is that the radiation pattern varies
Horn_loudspeaker
Vertical omnidirectional transmitting antenna
the pattern made by the current imbalance on the matching section. The pattern in the elevation (or E plane) reveals a slight elevation of the pattern in
J-pole_antenna
Omnidirectional circular bent dipole antenna
an approximately omnidirectional radiation pattern in the horizontal plane and minimize wasteful vertical radiation. Small loops, on the other hand, are
Halo_antenna
Antenna designed by an evolutionary computer algorithm
stringent, conflicting, or unusual design requirements, such as unusual radiation patterns, for which none of the many existing antenna types are adequate. The
Evolved_antenna
Sound-producing device
All of these variations are characterised by a "figure-of-eight" radiation pattern in which the loudness falls towards the sides of the enclosure where
Dipole_speaker
Telecommunications performance metric
accuracy is also difficult to determine. Other radiation efficiency measurement techniques include: the pattern integration method, which requires gain measurements
Radiation_efficiency
generate an omnidirectional pattern, the two dipoles are fed 90° out of phase. The antenna radiates horizontally polarized radiation in the horizontal plane
Batwing_antenna
Hypothetical wave source which radiates equally in all directions
meaning in physics. In thermodynamics it refers to the electromagnetic radiation pattern which would be found in a region at thermodynamic equilibrium, as
Isotropic_radiator
Type of directional microwave antenna
antenna is a type of directional microwave antenna with a sector-shaped radiation pattern. The word "sector" is used in the geometric sense; some portion of
Sector_antenna
Horizontal Radiation Patterns Horizontal Polarization Radiation Pattern for the Slot at L1 Link. Horizontal Polarization Radiation Pattern for the Blade
Dual-band_blade_antenna
Electromagnetic frequencies ranging from 3 kHz to 300 GHz
Bandwidth (signal processing) Electromagnetic interference Electromagnetic radiation Electromagnetic spectrum EMF measurement Frequency allocation Frequency
Radio_frequency
Antenna used with a television to receive television programs
(the main lobe) is no longer perpendicular to the rods. Still, the radiation pattern will have lobes at an angle to the rods, making it advantageous to
Television_antenna
Type of radio-wave propagation
the practical distinction arises solely from different desirable radiation patterns of the antennas (near vertical for NVIS, near horizontal for conventional
Near vertical incidence skywave
Near_vertical_incidence_skywave
Scattering of an electromagnetic plane wave by a sphere
distances from the particle, the radiation pattern of the scattered field will be similar to the corresponding radiation pattern of the angular part of vector
Mie_scattering
phones, and various other electronic devices, emit radiation which consists of non-ionising radiation or radiofrequency electromagnetic fields (RF EMF)
Wireless device radiation and health
Wireless_device_radiation_and_health
Nonlinear optical process
membranes and demonstrations of SHG in complex nanomaterials. The SHG radiation pattern generated by an exciting Gaussian beam also has a (homogeneous) 2D
Second-harmonic_generation
the earth. It is used as a geometrical technique in calculating the radiation pattern of the antenna. When a radio antenna is mounted near a conductive
Image_antenna
Acoustical component
same horn mouth. A more uniform radiation pattern throughout the frequency range is also possible. A uniform pattern is handy for smoothly arraying multiple
Loudspeaker_enclosure
Measure of how much of an antenna's signal is transmitted in one direction
measures the degree to which the radiation emitted is concentrated in a single direction. It is the ratio of the radiation intensity in a given direction
Directivity
Numerical method in computational electromagnetics
for example antenna simulation programs like NEC that calculate the radiation pattern of an antenna. Generally being a frequency-domain method, it involves
Method of moments (electromagnetics)
Method_of_moments_(electromagnetics)
antennas typically try to limit the range of their vertical plane radiation pattern to concentrate energy over a smaller range and increase gain. "47
Vertical and horizontal (radio propagation)
Vertical_and_horizontal_(radio_propagation)
Accounting of signal gains and losses in communications
distribute the power equally in every direction of a plane, so the radiation pattern has the shape of a sphere squeezed between two parallel flat surfaces
Link_budget
Underwater sound detected in 1997 from a non-tectonic cryoseism (ice quake)
sound "can also be caused by so-called angular frequency dependent radiation patterns associated with antisymmetric mode motion of the ice cover." Two processes
Bloop
American radio towers
design of the antenna, because conductive guys interfered with its radiation pattern. The guys acted as "parasitic" resonant elements, reradiating the
Blaw-Knox_tower
14 GHz and 25 GHz, an RF MEMS radiation pattern reconfigurable spiral antenna for 6 and 10 GHz, an RF MEMS radiation pattern reconfigurable spiral antenna
Radio-frequency microelectromechanical system
Radio-frequency_microelectromechanical_system
Result of nuclear radiation exposure
Acute radiation syndrome (ARS), also known as radiation sickness or radiation poisoning, is a collection of health effects that are caused by being exposed
Acute_radiation_syndrome
Radio antenna which has greater performance in specific alignments
to which an antenna's angular distribution of radiated power, its radiation pattern, is concentrated in one direction is measured by a parameter called
Directional_antenna
Parameter characterizing an AC conductor
other), fed with different frequencies, will have the same radiation resistance and radiation pattern and fed with equal power will radiate the same power density
Electrical_length
Measure of antenna performance
pointed into space or staring into the sun. For an antenna with a radiation pattern given by G(θ, φ), the noise temperature is mathematically defined
Antenna gain-to-noise-temperature
Antenna_gain-to-noise-temperature
Equivalence between complementary antenna types
that is transparent. The sum of the radiation patterns caused by B and B' must be the same as the radiation pattern of the unobstructed beam. In places
Babinet's_principle
Tensioned cable designed to add stability to a freestanding structure
wavelength multiples of the transmitted frequency can distort the radiation pattern of the antenna. This also applies to guy wires of neighboring masts
Guy-wire
Class of large multielement directional wire radio transmitting antennas
prevent ground reflections from interfering with the radiation pattern. This allows most of the radiation to be concentrated in a narrow main lobe aimed a
Curtain_array
Rhombus-shaped antenna
terminated with a non-inductive resistor. When resistor-terminated, the radiation pattern is unidirectional, with the main lobe off the terminated end, so this
Rhombic_antenna
Telecommunications networks transmitted by radio waves
service is divided into cells in a pattern dependent on terrain and reception characteristics. These cell patterns roughly take the form of regular shapes
Cellular_network
Function in the theory of antennas
multiplied by the radiation pattern of an individual antenna to produce the pattern of the entire array. This difference in the patterns is due to the constructive
Array_factor
Arrangement of mirrors
mirrors, and due to the effects of interference, only certain patterns and frequencies of radiation will be sustained by the resonator, with the others being
Optical_cavity
Type of radio antenna
offering a frequency range ratio of up to approximately 10:1. The radiation pattern in the vertical plane is quite narrow, making its sensitivity highest
Discone_antenna
Branch of physics
subfield is antenna modeling computer programs, which calculate the radiation pattern and electrical properties of radio antennas, and are widely used to
Computational electromagnetics
Computational_electromagnetics
Type of antenna
self-complementary antenna (or Square SCA) has practically omnidirectional radiation pattern as well as the broadband property. The log-periodic antenna is a modified
Self-complementary_antenna
Class of directive antennas
elements mounted in front of a metal surface. When driven in phase, the radiation pattern of the reflective array is a single main lobe perpendicular to the
Reflective_array_antenna
Formula in telecommunications engineering of antenna performance
antenna performance by its effective area rather than by its power gain or radiation resistance. Few follow Friis' advice on using antenna effective area to
Friis_transmission_equation
Signal processing technique for sensor arrays
information from different sensors is combined in a way where the expected pattern of radiation is preferentially observed. For example, in sonar, to send a sharp
Beamforming
Apparent center of radio emission from an antenna
is used to describe the phase center in a limited section of the radiation pattern. If it is used in the context of an antenna array, one has to define
Phase_center
Physical model of propagating energy
In physics, electromagnetic radiation (EMR) or an electromagnetic wave (EMW) is a self-propagating wave of the electromagnetic field that carries momentum
Electromagnetic_radiation
Type of RF antenna
antennas are independent of frequency: the driving point impedance, radiation pattern and polarization of such antennas remain unchanged over a large bandwidth
Spiral_antenna
Self-similar growth curve
antennas are frequency-independent antennas, that is, antennas whose radiation pattern, impedance and polarization remain largely unmodified over a wide
Logarithmic_spiral
Room designed to be completely echo free
measurements of antenna radiation patterns and electromagnetic interference. Performance expectations (gain, efficiency, pattern characteristics, etc.)
Anechoic_chamber
Type of antenna
feed horn is usually selected with the 3 dB points of the horn's radiation pattern falling on the edge of the reflector (the beamwidth of the horn matching
Feed_horn
Zone of energetic charged particles around the planet Earth
The Van Allen radiation belt is a zone of energetic charged particles, most of which originate from solar wind, that are captured and held around a planet
Van_Allen_radiation_belt
Use of radio waves for communication
transmitter, the distance depending on the transmitter power, the antenna radiation pattern, receiver sensitivity, background noise level, and presence of obstructions
Radio
Type of radio antenna
resistor to ground. The antenna has a unidirectional radiation pattern with the main lobe of the pattern at a shallow angle into the sky off the resistor-terminated
Beverage_antenna
In radio electronics, a null is a direction in an antenna's radiation pattern where the antenna radiates almost no radio waves, so the far field signal
Null_(radio)
Radio frequency not deliberately created
Equivalent radius Factor Friis transmission equation Gain Height Radiation pattern Radiation resistance Radio propagation Radio spectrum Signal-to-noise ratio
Spurious_emission
Type of electromagnetic radiation
waves (formerly called Hertzian waves) are a type of electromagnetic radiation with the lowest frequencies and the longest wavelengths in the electromagnetic
Radio_wave
Behaviour of travelling radio waves
or into various parts of the atmosphere. As a form of electromagnetic radiation, like light waves, radio waves are affected by the phenomena of reflection
Radio_propagation
Therapy using ionizing radiation, usually to treat cancer
Radiation therapy or radiotherapy (RT, RTx, or XRT) is a treatment using ionizing radiation, generally provided as part of cancer therapy to either kill
Radiation_therapy
Form of electromagnetic radiation
Ultraviolet radiation (UV; sometimes called ultraviolet light) is electromagnetic radiation of wavelengths of 100–400 nanometers, shorter than that of
Ultraviolet
Antenna system type
dipoles and quarter-wavelength monopoles have an omnidirectional radiation pattern in free space when oriented vertically; they radiate equal radio power
Collinear_antenna_array
Brightness in an image or video
the line between the green and magenta bars of the SMPTE color bars test pattern. Error in luminance can be seen as a dark band that occurs in this area
Luma_(video)
Class of antennas
Cherenkov radiation". Their proposed backward-wave radiating structure was inspired by negative refractive index LC materials. The simulated E-plane pattern at
Metamaterial_antenna
Military air navigation system
cylinder, containing a vertical reflector that distorts the circular radiation pattern into a cardioid with a 15 cycle per second 12 to 30 percent modulation
Tactical air navigation system
Tactical_air_navigation_system
RADIATION PATTERN
RADIATION PATTERN
Boy/Male
Hindu, Indian
Tradition
Girl/Female
Hindu, Indian
Tradition
Boy/Male
Hindu
Tradition, Culture
Boy/Male
Tamil
Tradition, Culture
Girl/Female
Gaelic, Indian, Kannada
Tradition
Boy/Male
Hindu, Indian
Variation
Girl/Female
Tamil
Ratnaprabha | ரதà¯à®¨à®ªà¯à®°à®ªà®¾
Radiation from the diamonds
Ratnaprabha | ரதà¯à®¨à®ªà¯à®°à®ªà®¾
Girl/Female
Indian
Tradition
Girl/Female
Hindu
Tradition, Culture
Boy/Male
Hindu, Indian
Tradition
Girl/Female
Hindu
Radiation from the diamonds
Girl/Female
Indian, Telugu
Tradition
Boy/Male
Muslim
Mediation. Advocacy.
Boy/Male
Hindu, Indian
Tradition
Boy/Male
Muslim
Intercession, Mediation
Boy/Male
Hindu, Indian
Tradition
Girl/Female
Tamil
Tradition, Culture
Girl/Female
Danish, Indian, Punjabi, Sikh
Tradition
Boy/Male
Muslim
Mediation. Advocacy.
Boy/Male
Indian
Intercession, Mediation
RADIATION PATTERN
RADIATION PATTERN
Girl/Female
Irish Gaelic Celtic
Fire.
Girl/Female
Indian, Punjabi, Sikh
A Prayer; Sweet Wish; Intelligent
Girl/Female
French
Canal; channel. The popular perfume Chanel.
Male
English
Anglicized form of Hebrew Nebuwkadnetstsar, NEBUCHADNEZZAR means "Nebo, defend my crown" or "Nebo, defend my firstborn son." In the bible, this is the name of a ruler of Babylon who conquered Judah and Jerusalem and destroyed temples.
Boy/Male
Indian, Punjabi, Sikh
One with Honourable Status
Girl/Female
Afghan, American, German, Greek, Hindu, Indian, Kannada, Latin, Malayalam, Marathi, Sanskrit, Sindhi, Tamil, Telugu
Moon; Enchanting Moon; Precious Stone (Sapphire)
Boy/Male
American, British, English
From the Powerful Mill; Mill Ruler
Boy/Male
Hindu
God of mountain attributed to Lord Shiva
Boy/Male
British, English
From the Deer's Stream
Girl/Female
American, Australian, British, Chinese, Christian, English, German, Greek, Hebrew
Honey; Diminutive of Melinda; Gentle; Dark; Love; Dark Beauty
RADIATION PATTERN
RADIATION PATTERN
RADIATION PATTERN
RADIATION PATTERN
RADIATION PATTERN
n.
That which radiates or emits rays, whether of light or heat; especially, that part of a heating apparatus from which the heat is radiated or diffused; as, a steam radiator.
n.
The act of radiating, or the state of being radiated; emission and diffusion of rays of light; beamy brightness.
a.
Pertaining to mediation; used in mediation; as, mediative efforts.
n.
The act of graduating, or the state of being graduated; as, graduation of a scale; graduation at a college; graduation in color; graduation by evaporation; the graduation of a bird's tail, etc.
n.
The disposition of the roots of a plant.
n.
The act of varying; a partial change in the form, position, state, or qualities of a thing; modification; alternation; mutation; diversity; deviation; as, a variation of color in different lights; a variation in size; variation of language.
n.
Mediation.
n.
The process of taking root, or state of being rooted; as, the radication of habits.
n.
Variety; gradation; degree.
a.
Radiating; radiant.
n.
The measurement of the force of solar radiation.
a.
Capable of radiating; acting by radiation.
n.
Emission of radiance.
n.
Radiation of light.
adv.
Without variation.
n.
The act of progressing by regular steps or orderly arrangement; the state of being graded or arranged in ranks; as, the gradation of castes.
adv.
By tradition.
n.
Eradication.
v. t.
To transmit by way of tradition; to hand down.
n.
The shooting forth of anything from a point or surface, like the diverging rays of light; as, the radiation of heat.