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Antenna slot uhf

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Antenna types

Sector antennas white bars on cell phone tower. An isotropic antenna isotropic radiator is a hypothetical antenna that radiates equal signal power in all directions, often compared to an incandescent lightbulb. Endfire arrays are fed out-of-phase, with the phase difference corresponding to the distance between them; they radiate within the antenna plane. Unlike the above antennas, traveling wave antennas are not resonant so they have inherently broad bandwidth. Quadrant antenna, similar to rhombic , at an Austrian shortwave broadcast station. The dipole is the prototypical antenna on which a large class of antennas are based. He invented it in order to produce a practical type of antenna for VHF television broadcasting that would have horizontal polarization, an omnidirectional horizontal radiation pattern and a narrow vertical radiation pattern.

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In radio systems, many different antenna types are used with specialized properties for particular applications. Antennas can be classified in various ways. The list below groups together antennas under common operating principles, following the way antennas are classified in many engineering textbooks.

The dipole, monopole, array and large loop antenna types below typically function as resonant antennas; waves of current and voltage bounce back and forth between the ends, creating standing waves along the elements.

Aperture antennas can be resonant or not. Traveling wave antennas are nonresonant types, the current and voltage waves travel in one direction along the antenna elements. An isotropic antenna isotropic radiator is a hypothetical antenna that radiates equal signal power in all directions, often compared to an incandescent lightbulb. It is a mathematical model that is used as the base of comparison to calculate the directionality or gain of real antennas. No real antenna can have an isotropic radiation pattern , but the isotropic radiation pattern serves as reference for comparing the radiation intensity of other antennas, regardless of type.

An "isotropic antenna" should not be confused with an " omnidirectional antenna "; an isotropic antenna radiates equal power in all three dimensions, while an omnidirectional antenna radiates equal power in all horizontal directions, with the power radiated varying with elevation angle, but decreasing to zero along the antenna's vertical axis.

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A slot antenna consists of a metal surface, usually a flat plate, with one or more holes or slots cut out. When the plate is driven as an antenna by a driving frequency, the slot radiates electromagnetic waves in a way similar to a dipole antenna. The shape and size of the slot, as well as the driving frequency, determine the radiation pattern. Often the radio waves are provided by a waveguide , and the antenna consists of slots in the waveguide. Slot antennas are often used at UHF and microwave frequencies instead of line antennas when greater control of the radiation pattern is required.

Slot antennas are widely used in radar antennas, particularly marine radar antennas on ships, for the sector antennas used for cell phone base stations , and are often found in standard desktop microwave sources used for research purposes. A slot antenna's main advantages are its size, design simplicity, and convenient adaptation to mass production using either waveguide or PC board technology.

Due to Babinet's principle a slot in a waveguide has the same radiation pattern as a driven rod antenna whose rod is the same shape as the slot. This can be used to determine the radiation pattern using calculations for a more conventional antenna. He invented it in order to produce a practical type of antenna for VHF television broadcasting that would have horizontal polarization, an omnidirectional horizontal radiation pattern and a narrow vertical radiation pattern.

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From Wikipedia, the free encyclopedia. It has been suggested that slotted waveguide be merged into this article. Discuss Proposed since December The life and times of A.

Institution of Engineering and Technology. Antenna types. Isotropic radiator. Categories : Radio frequency antenna types Antennas radio Technology stubs. Hidden categories: Articles to be merged from December All articles to be merged All stub articles. Namespaces Article Talk. Views Read Edit View history. By using this site, you agree to the Terms of Use and Privacy Policy.

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Slot machine terminology, characteristics and regulations vary around the world. In Australia "poker machines" or "pokies" are officially termed gaming machines. Australian-style gaming machines frequently use video displays to simulate physical reels, usually five. These machines have additional bonusing and second-screen features such as free games and bonus levels. They also allow for multiple lines up to or multiple ways up to 3, to be played.

On multiway games, players play the entire position of each reel instead of fixed lines or patterns. For instance, if a player plays 1 reel on a way game, they receive three symbols in the first reel which pay anywhere in the three positions, while all other reels pay in the centre only, with unused areas darkened. On the other end of the scale, if the player plays 5 reels, symbols can appear anywhere in the window and will pay as long as there is one in each reel.

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Most games however still require the symbols appearing left to right, sometimes this even includes scatters. Other multiway games give you even more ways by using a 4x5 or 5x5 pattern, where there are up to 5 symbols in each reel, allowing for up to 1, and 3, ways to win respectively. These games typically cost more than their way Reel Power counterparts. Recently, IGT has also started to manufacture multiway games. Gaming machine manufacturer Konami Australia also made an alternative way of gaming by using patterns, where symbols pay adjacent to one another.

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Most of these games have a hexagonal reel formation, and much like multiway games, any patterns not played are darkened out of use. On both systems, scatter symbols still pay in the darkened areas just like standard machines where scatters don't have to appear on a payline.

The laws regulating the use of gaming machines in Australia are a matter for state governments, and as such they vary between States. Gaming machines are found in casinos approximately one in each major city as well as pubs and clubs in some states usually sports, social, or RSL clubs. The first Australian state to legalize this style of gambling was New South Wales in when they were made legal in all registered clubs in the state.

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