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Type of RF antenna
A spiral antenna is a type of radio frequency antenna shaped as a spiral, first described in 1956. Archimedean spiral antennas are the most popular, while
Spiral_antenna
Physical transmission device
gain antenna consisting of an array of smaller antenna elements. A leaky wave antenna uses a leaking transmission line to obtain radiation. A spiral antenna
Microwave_antenna
Self-similar growth curve
spiral, equiangular spiral, or growth spiral is a self-similar spiral curve that often appears in nature. The first to describe a logarithmic spiral was
Logarithmic_spiral
Spiral with constant distance from itself
The Archimedean spiral (also known as Archimedes' spiral, the arithmetic spiral) is a spiral named after the 3rd-century BC Greek mathematician Archimedes
Archimedean_spiral
Device that transmits and receives radio waves
monopole antennas Array antennas Loop antennas Parabolic antenna Traveling wave antennas Log-periodic antenna Spiral antenna Horn antenna Adcock antenna Sector
Antenna_(radio)
Rectangular two-element array antenna
The Moxon antenna or Moxon rectangle is a simple and mechanically rugged two-element parasitic array, single-frequency antenna. It takes its name from
Moxon_antenna
Dipole antenna optimized for operation in the High Frequency bands
this antenna in 1946. It is very popular in the United States. The antenna can be erected as horizontal dipole, as sloper, or an inverted-V antenna. With
G5RV_antenna
radiation pattern reconfigurable spiral antenna for 6 and 10 GHz, an RF MEMS radiation pattern reconfigurable spiral antenna for the 6–7 GHz frequency band
Radio-frequency microelectromechanical system
Radio-frequency_microelectromechanical_system
Multi-element, directional antenna useable over a wide band of frequencies
such as logarithmic spiral antennas (which are not classified as log-periodic per se but among the frequency independent antennas that are also self-similar)
Log-periodic_antenna
The sloper antenna is a slanted dipole antenna. While horizontal dipoles required two large support masts, this antenna type only needs one large mast
Sloper_antenna
Type of radio-wave propagation
distinction arises solely from different desirable radiation patterns of the antennas (near vertical for NVIS, near horizontal for conventional long-range skywave
Near vertical incidence skywave
Near_vertical_incidence_skywave
Shortwave antenna
Isotron is the trade name for a shortwave antenna marketed by Bilal Co. for use as an amateur radio transmitting antenna for restricted spaces. It is physically
Isotron
Non-commercial use of the radio spectrum
also affect transmissions: The United Kingdom measures at the point the antenna is connected to the signal feed cable, which means the radio system may
Amateur_radio
Logarithmic spiral projected onto the surface of a cone
Equiangular Spiral Antenna. In: IRE Transactions on Antennas and Propagation. Vol. 7, 1959, pp. 181–187. T. A. Kozlovskaya: The Concho-Spiral on the Cone
Conchospiral
Active antennas that are designed to resist radio jamming
active antenna arrays composed of multiple antenna elements, typically arranged in a compact configuration. Unlike traditional omnidirectional antennas, which
Controlled reception pattern antenna
Controlled_reception_pattern_antenna
Antenna constructions for different applications
name' for a plastic-covered spiral stub antenna; its more formal technical name is normal-mode helix. Most common antenna used on portable two-way radios
Antenna_types
Measurement of the direction from which a received signal was transmitted
_{c})^{2}}}} Two antenna types, popular for DF, are cavity-backed spirals and horn antennas. Antenna polar plot Antenna log plot Cavity backed spiral Pyramidal
Direction_finding
Numerical method in computational electromagnetics
waves with matter, for example antenna simulation programs like NEC that calculate the radiation pattern of an antenna. Generally being a frequency-domain
Method of moments (electromagnetics)
Method_of_moments_(electromagnetics)
Class of antennas
Metamaterial antennas are a class of antennas which use metamaterials to increase performance of miniaturized (electrically small) antenna systems. Their
Metamaterial_antenna
Chinese lunar communications satellite
(14 ft) deployable parabolic antenna, the largest antenna used for a deep space exploration satellite. The large parabolic antenna provides 10 simultaneously
Queqiao-2
Soviet/Russian air-to-surface missile
seeker of the anti-radar version has a unique antenna, an interferometer array of seven spiral antennas on a steerable platform. The seekers delivered
Kh-31
Skyscraper in Chicago, Illinois
Comcast Technology Center in Philadelphia. When measured to the top of its antenna masts, it stands at 1,500 feet (457 m). The building is home to several
John_Hancock_Center
Electrical engineer and academic
to music from Italian radio stations. Needing a broadband antenna, Aristides designed a spiral, rhombic-shaped wire object that he and Nicolaos mounted
Nicolaos_Alexopoulos
Brazilian anti-radiation missile
Mectron. Another obstacle arose in 1999, when Brazil tried to purchase spiral antennas and some other systems for MAR-1's search head development from a Las
MAR-1
Mars landing demonstration system
the lander. When the back shell is ejected, it can transmit from the spiral antenna on body of the lander. When an orbiter can communicate with the lander
Schiaparelli_EDM
Radio telescope array
upgrade the older antennas. This would bring the array to have the total of 15 antennas with 13 smaller antennas in a three-arm spiral configuration that
Owens_Valley_Solar_Array
Type of antenna
self-complementary antenna (SCA) is a basic antenna for extremely broadband practical antennas. This antenna is an arbitrarily shaped antenna which is constituted
Self-complementary_antenna
Fractal named after mathematician Benoit Mandelbrot
unique path to the spiral center passes the satellite from the groove of the cardioid to the top of the "antenna" on the "head". "Antenna" of the satellite
Mandelbrot_set
Antenna used in wireless communication
inverted-F antenna is a type of antenna used in wireless communication, mainly at UHF and microwave frequencies. It consists of a monopole antenna running
Inverted-F_antenna
undersea cables. The minimum radar-warning receiver is usually a set of spiral antennas, backed with resonant cavities, whose amplitude can be compared to
Signals intelligence operational platforms by nation
Signals_intelligence_operational_platforms_by_nation
Radio observatory in France
between 1974 and 1977. It consists of 144 spiral antennas, which are made from conducting cables spun in spiral curves around conical support structures
Nançay_Radio_Observatory
"Application of High Impedance Electromagnetic Surface to Archimedean Planner Spiral Antenna," Microwave and Optical Technology Letters, January 2007, p. 129. Sievenpiper
Tunable_metamaterial
Folding antenna
Spring tension is provided by a spiral spring in the base section. An antenna top cap installed on the tip of the antenna provides protection for personnel
Whip-a-way
Electronic musical instrument
usually consists of two metal antennas that function not as radio antennas but rather as position sensors. Each antenna forms one half of a capacitor
Theremin
Electrical resonant transformer circuit invented by Nikola Tesla
S. patent 2,125,804, "Antenna". (Filed May 25, 1934; Issued August 2, 1938) William W. Brown, U.S. patent 2,059,186, "Antenna structure". (Filed May
Tesla_coil
Historical style of weapon
were also produced. Some Bronze Age swords have also been referred to as antenna swords due to their design. Before bronze, stone (such as flint and obsidian)
Bronze_Age_sword
Construction that bridges a large vertical distance with steps
of the oldest structures in architectural history. The oldest example of spiral stairs dates back to the 400s BC. Medieval architecture saw experimentation
Stairs
System used in radar to improve accuracy
units to improve their accuracy, as well as making it easier to steer the antenna properly to point at a target. Conical scanning is similar in concept to
Conical_scanning
Topics referred to by the same term
differential equation In physics: Parabolic trajectory In technology: Parabolic antenna Parabolic microphone Parabolic reflector Parabolic trough - a type of solar
Parabolic
German physicist (1857–1894)
(although the actual prize had expired uncollected in 1882). He used a dipole antenna consisting of two collinear one-meter wires with a spark gap between their
Heinrich_Hertz
United States historic place
park called Astor Park. The 125-foot (38 m)-tall column has a 164-step spiral staircase ascending to an exterior observation deck at the top. The tower
Astoria_Column
resolution of less than 2 m (6 ft 7 in). The position was measured by small spiral antennas running in the guide track, which also send position information to
Computer-controlled Vehicle System
Computer-controlled_Vehicle_System
Galaxies in the constellation Corvus
Antennae were two separate galaxies. NGC 4038 was a barred spiral galaxy and NGC 4039 was a spiral galaxy. 900 million years ago, the Antennae began to approach
Antennae_Galaxies
Two-way radio system
range: 380–470 MHz (UHF R1) Power output: 2.5–5 watts Antenna: omnidirectional, flexible monopole antenna mounted to radio body with SMA connector. 50Ω characteristic
AN/PRC-153
Type of radio transmitter
other spiral. Heinrich Hertz discovering radio waves with his spark oscillator (at rear) Hertz's drawing of one of his spark oscillators. (A,A') antenna, (J)
Spark-gap_transmitter
height includes spires and architectural details but does not include antenna masts. An equal sign (=) following a rank indicates the same height between
List of tallest buildings in Tel Aviv
List_of_tallest_buildings_in_Tel_Aviv
Lower bound on the quality factor of small radio antennae
like antenna from 1998 size 0.62 and 22% bandwidth. The Rogers cone from 2001 is size 0.65 and right on the limit. Lina and Choo planar spirals in size
Chu–Harrington_limit
Electrical cable with concentric conductors
television signals, and connecting radio transmitters and receivers to their antennas. It differs from other shielded cables because the dimensions of the cable
Coaxial_cable
Topics referred to by the same term
bio-magnetic fields of marine biology. Electroculture antenna, a geometric conduit, such as a Fibonacci spiral, designed to tune terrestrial soil to the atmospheric
Toroidal
Radio astronomy observatory in New Mexico, US
up to 351 independent baselines: in essence, the array acts as a single antenna with a variable diameter. The angular resolution that can be reached is
Very_Large_Array
European space mission to measure gravitational waves
The Laser Interferometer Space Antenna (LISA) is a planned European space mission to detect and measure gravitational waves—slight ripples in the fabric
Laser Interferometer Space Antenna
Laser_Interferometer_Space_Antenna
American astrophysicist (1910–2004)
astronomy, and antenna theory. His inventions included the helical antenna, the corner reflector antenna, and several other types of antennas. He designed
John_D._Kraus
Topics referred to by the same term
musical instrument Spiral array model, a music pitch space Telescope array, a group of telescopes, mirror segments, or radio telescope antennas used to provide
Array
Radar performance enhancement strategy
ultrasonography. Pulse-Doppler begins with coherent pulses transmitted through an antenna or transducer. There is no modulation on the transmit pulse. Each pulse
Pulse-Doppler signal processing
Pulse-Doppler_signal_processing
German WWII ground-based tracking radar
and subsequent mapping of the spiral arms of our Milky Way Galaxy. German radar equipment including two Würzburg antennas (obtained from RAE Farnborough)
Würzburg_radar
1996 compilation album by Various artists
William Orbit 4:09 9. "A Trip to G9" Spiral Realms 6:51 10. "Space Does Not Care" Zero Gravity 2:30 11. "Antenna" Kraftwerk 3:44 12. "#9" Aphex Twin 7:02
Space Daze 2000: A Mind Journey of Electronic Ambient Space Rock
Space_Daze_2000:_A_Mind_Journey_of_Electronic_Ambient_Space_Rock
windscreen) Windshield washer (or windscreen wiper) motor Window seal Antenna assembly Antenna cable Radio and media player Speaker Tuner Subwoofer Video player
List_of_auto_parts
First Canadian satellite
of the metal caused it to unwind into a long spiral. The result was a stiff circular cross-section antenna known as a "STEM", for "storable tubular extendible
Alouette_1
Passive two-terminal electrical component that stores energy in its magnetic field
material for a loopstick antenna?". Amateur Radio beta. Stack Exchange, Inc. Retrieved March 5, 2014. Poisel, Richard (2011). Antenna Systems and Electronic
Inductor
Spectral line of hydrogen state transition in UHF radio frequencies
in 1951. Observations of the hydrogen line have been used to reveal the spiral shape of the Milky Way, to calculate the mass and dynamics of individual
Hydrogen_line
City in San Luis Potosí, Mexico
built in 1988 and measures 64 m to the top floor, with the spiral 75 m, with the antenna 98 meters. It has 17 floors, with 10 levels of parking at the
San_Luis_Potosí_(city)
Historic Irish reflecting telescope
10 MHz to 240 MHz frequency range with two types of antennas: Low Band Antenna (LBA) and High Band Antenna (HBA), optimized for 10–80 MHz and 120–240 MHz respectively
Leviathan_of_Parsonstown
Graphical calculator used in electrical engineering
(2013-01-11) [2010]. "The Smith Chart". Antenna-Theory.com. Archived from the original on 2023-07-08. Retrieved 2023-07-09. "Antenna Matching with a Vector Network
Smith_chart
British radar systems in aircraft
allowed it to be rotated in a spiral pattern. The cockpit display was modified to spin the timebase at the same speed as the antenna, 17 times a second. The
Aircraft_interception_radar
NATO code names for foreign military equipment
radar C Cage Bare – VHF antenna Cage Cone – VHF antenna Cage Pot – Electronic warfare jamming radar Cage Stalk – VHF antenna Clam Shell – 76N6 low-altitude
NATO_reporting_name
List of common names used to refer to fish
Antarctic cod Antarctic icefish (suborder Notothenioidei of order Perciformes) Antenna codlet (Bregmaceros atlanticus) Arapaima (genus Arapaima) Archerfish (genus
List_of_fish_by_common_name
2021 NASA planetary defense mission
new type of high-gain communication antenna, a Spiral Radial Line Slot Array (RLSA). The circularly-polarized antenna operated at the (microwave) X-band
Double Asteroid Redirection Test
Double_Asteroid_Redirection_Test
Coordinates comprising a distance and an angle
inherently tied to direction and length from a center point in a plane, such as spirals. Planar physical systems with bodies moving around a central point, or
Polar_coordinate_system
Extinct genus of Cambrian organisms
structure formed of three concentric circular features surrounds the mouth. An antenna-form structure just posterior to the mouth may be a sensory organ. The
Banffia
Joint U.S.-Taiwanese research satellite constellation
Forward, one Aft Each RO Antenna is composed of three vertical sub-arrays, four elements each. Each element is a two-turn helical spiral. The collected signals
COSMIC-2
to the public in 1999. The Mode Gakuen Spiral Towers, completed in 2008, is noteworthy for its unusual spiral architectural structure, having established
List of tallest buildings in Nagoya
List_of_tallest_buildings_in_Nagoya
Helical spring toy
a classroom teaching tool, and also as a portable and extendable radio antenna in the battlefield (particularly in the Vietnam War). It was inducted into
Slinky
January 9, 2026. "Larry June, Curren$y, & The Alchemist Announce New Album Spiral Staircases". Stereogum. February 13, 2026. Retrieved February 14, 2026.
List_of_2026_albums
Family of insects
often called a "doodlebug" in North America because of the odd winding, spiralling trails it leaves in the sand while relocating, which look as if someone
Antlion
Broadcasting and observation tower in Japan
480 ft), with a capacity of 900 people. The upper observatory features a spiral, glass-covered skywalk in which visitors ascend the last 5 m (16 ft) to
Tokyo_Skytree
List of buildings taller than 300 metres (980 feet)
construction, will become the first supertall building in Turkey. Azrieli Spiral Tower in Tel Aviv and Beyond Tower in Givatayim, both in construction, will
List_of_supertall_skyscrapers
Van used to detect the presence of a television set
to make do with only 110–250 MHz. The antenna on the detector car was a rotatable, highly directional antenna. It was used by taking bearings on the
TV_detector_van
Shape with three equal sides
celestial mechanics's three-body problem, the Laser Interferometer Space Antenna's three identical observatory of gravitational waves spacecrafts, and triangulation
Equilateral_triangle
Topics referred to by the same term
material extending out from spiral galaxies Antenna blind cone, the volume of space that cannot be scanned by an antenna Cone clutch, which serves the
Cone_(disambiguation)
Vehicle-launched surface-to-air missile system
of the tracking radar antenna is a small J band parabolic dish antenna to track the missile. Below it is a small circular antenna which emits an I band
9K33_Osa
NASA flyby mission to Venus (1967–1968)
Mariner 4, Mariner 5 needed to face away from the Sun to keep its high-gain antenna pointed at Earth because of its trajectory. As a result, the solar panels
Mariner_5
American television sitcom (1996–2001)
extraterrestrial research expedition hailing from a planet in a barred spiral galaxy on the Cepheus-Draco border attempting to live as a normal human
3rd_Rock_from_the_Sun
height measurement, which includes antenna masts. Standard architectural height measurement, which excludes antennas in building height, is included for
List of tallest buildings in the United States
List_of_tallest_buildings_in_the_United_States
Type of angular momentum in light
artificially using a variety of tools, such as using spiral phase plates, spatial light modulators and q-plates. Spiral wave plates, made of plastic or glass, are
Orbital angular momentum of light
Orbital_angular_momentum_of_light
British astronomer
technology, particularly involving VLBI. His design for a spiral configuration of antennas was adopted for the telescope ALMA. Conway was one of the scientists
John_Conway_(astronomer)
American sport utility vehicle
previous years. The OnStar and XM Satellite Radio antennas were merged into one "shark fin" antenna. The Chevrolet badging was also removed from the liftgate
Chevrolet_Tahoe
pinnacle height, including antenna masts. Standard architectural height measurement, which excludes non-architectural antennas in building height, is included
List of tallest buildings in New York City
List_of_tallest_buildings_in_New_York_City
Measure of a civilization's evolution
following two decades (i.e. in the 1980s) it would be possible to build antennas of 100,000 m2 capable of detecting Type II and III civilizations. A Type I
Kardashev_scale
Log-likelihood ratio Log-log graph Log-normal distribution Log-periodic antenna Log semiring Log structure Log-Weibull distribution Logarithmic algorithm
Index_of_logarithm_articles
October 16 - In the 1945 Beiping C-46 crash, a USAAF Curtiss C-46 struck an antenna on approach to Nanyuan Airport and crashed near Beiping (now Beijing),
List of accidents and incidents involving commercial aircraft
List_of_accidents_and_incidents_involving_commercial_aircraft
Galaxy in the constellation Hydra
NGC 5495 is a very large barred spiral galaxy located in the constellation Hydra. Its speed relative to the cosmic microwave background is 6,989 ± 20 km/s
NGC_5495
multiplication ratios and extremely short rise times of spiral transmission line types. A spiral VIG consists of four alternating conductor-insulator-conductor-insulator
Vector_inversion_generator
Skyscraper in Dubai, United Arab Emirates
(2,722 ft, or just over half a mile) and a roof height (excluding the antenna, but including a 242.6 m spire) of 828 m (2,717 ft). It has been the tallest
Burj_Khalifa
St. Louis) Red Red Meat (July 2, Chicago) Catherine (July 3, Chicago) Antenna (July 5, Indianapolis) Lambchop (July 6, Nashville) Scrawl (July 8, Columbus)
List of Lollapalooza lineups by year
List_of_Lollapalooza_lineups_by_year
Chinese reusable spacecraft
amateur in late July 2024, revealing structures similar to solar panels or antennas. The payload fairings used, having been photographed after their fall to
Chinese reusable experimental spacecraft
Chinese_reusable_experimental_spacecraft
South Korean fighter aircraft
upgrades, including a reprofiled canopy, low-RCS radome, and new conformal antennas, to improve its survivability against radar threats. In its MUM-T role
KAI_KF-21_Boramae
French television channel
from where a feeder connected it to the four 2 kW shortwave transmitting antennas located at the top of the tower 320 meters (1050 feet) high and which can
TF1
Russian stealth multirole fighter aircraft
cheeks of the forward fuselage for increased angular coverage. The nose antenna is tilted backwards for stealth. Moreover, the side-looking radar could
Sukhoi_Su-57
Electronic device
the two antennas was more closely pointed at the target, and be equal when the antenna was properly aligned. To display this, both antennas were connected
Radar_display
Historic church in Cologne, Germany
pilgrimage sites of Northern Europe. Visitors can climb 533 stone steps of the spiral staircase to a viewing platform about 100 m (330 ft) above the ground. The
Cologne_Cathedral
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