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http://dbpedia.org/ontology/abstract A monopole antenna is a class of radio antA monopole antenna is a class of radio antenna consisting of a straight rod-shaped conductor, often mounted perpendicularly over some type of conductive surface, called a ground plane.The driving signal from the transmitter is applied, or for receiving antennas the output signal to the receiver is taken, between the lower end of the monopole and the ground plane. One side of the antenna feedline is attached to the lower end of the monopole, and the other side is attached to the ground plane, which is often the Earth. This contrasts with a dipole antenna which consists of two identical rod conductors, with the signal from the transmitter applied between the two halves of the antenna. The monopole is often used as a resonant antenna; the rod functions as an open resonator for radio waves, oscillating with standing waves of voltage and current along its length. Therefore the length of the antenna is determined by the wavelength of the radio waves it is used with. The most common form is the quarter-wave monopole, in which the antenna is approximately one quarter of the wavelength of the radio waves. However in broadcasting monopole antennas 5/8 = 0.625 wavelength long are also popular, because at this length a monopole radiates a maximum amount of its power in horizontal directions. The monopole antenna was invented in 1895 by radio pioneer Guglielmo Marconi; for this reason it is sometimes called the Marconi antenna. The load impedance of the quarter-wave monopole is half that of the dipole antenna or 37.5 Ohms. Common types of monopole antenna are * whip * rubber ducky * helical * random wire * umbrella * inverted-L and T-antenna * folded unipole and inverted-F * mast radiator * ground plane antennas * mast radiator * ground plane antennas , De Marconi-antenne is genoemd naar haar uiDe Marconi-antenne is genoemd naar haar uitvinder Guglielmo Marconi en wordt gevoed met een ongebalanceerde voedingslijn zoals een coaxkabel. Ze bestaat uit een 1/4 λ driven-element verbonden met de kern van de coax geplaatst direct boven een perfect grondvlak zoals een moeras waarbij de mantel van de coax met een aardingspen van willekeurige lengte wordt verbonden. De impedantie aan de connector is ~50Ω. De antenne steunt op het principe waarbij een perfect grondvlak (goede geleider) het driven-element reflecteert waardoor in feite een dipool ontstaat. De Marconi-antenne wordt uitsluitend in verticale positie tegen de grond aangetroffen en wordt vaak gebruikt voor erg lage frequenties (AM-stations) waarbij de niet geaarde metalen mast meteen het driven-element vormt. Ze is dan omnidirectioneel, verticaal gepolariseerd, erg breedbandig en heeft een lage afstralingshoek naar de horizon. Deze lage afstralingshoek maakt het mogelijk om lange afstandsverbindingen (DX) te maken. lange afstandsverbindingen (DX) te maken. , Se denomina monopolo vertical a un tipo deSe denomina monopolo vertical a un tipo de antena (receptora o transmisora) que es la mitad de un dipolo vertical. Cuando el monopolo vertical se instala sobre un , según la teoría óptica de antenas, puede ser modelada como un clásico dipolo. El dipolo es por definición una antena simétrica respecto de su punto de alimentación central y por ello la denominación de alimentación balanceada, en cambio en el monopolo y el plano de tierra se configura una alimentación de tipo , siendo el "vivo" conectado al monopolo propiamente, y el "retorno" conectado al plano de tierra. La antena monopolo fue inventada en 1895 por el pionero de la radio Guglielmo Marconi. Por esta razón a veces se la llama antena Marconi. razón a veces se la llama antena Marconi. , Monopol, på engelska monopole, en typ av aMonopol, på engelska monopole, en typ av antenn, ibland i form av ett torn som fungerar som antenn (självstrålande mast). Ordet används ibland även om torn som bär antenner, strålkastare, m.m. Ordet är en sammansättning, som uttalas med o-ljud i slutstavelsen. Monopoler som antennbärare har blivit mer populära i och med utbyggnaden av tredje generationens mobiltelefoninät, UMTS. En variant av monopolen är monopoden, vilket är en monopol med inbyggt teknikutrymme i konstruktionens bas. Den sistnämnda lösningen är mindre vanlig i Sverige.mnda lösningen är mindre vanlig i Sverige. , Eine Groundplane-Antenne (GPA) (englisch MEine Groundplane-Antenne (GPA) (englisch Monopole antenna), kurz auch als Groundplane (GP) bezeichnet, eigentlich Monopolantenne, auch Viertelwellenstrahler, Stabantenne oder, nach ihrem Erfinder Guglielmo Marconi, Marconi-Antenne genannt, ist eine Vertikal-Antenne, bestehend aus einem vertikalen Stab oder selbststrahlenden Mast. Im Gegensatz zu einer Dipolantenne wird sie unsymmetrisch gespeist. Ergänzt wird sie zumeist durch ein sogenanntes „Gegengewicht“ (siehe auch Erdung), das durch die elektrisch gut leitfähige Erdoberfläche, ein in der Erde zusätzlich rund um die Antenne eingegrabenes Erdnetz oder, vor allem im VHF-Bereich, aber auch im Kurzwellenbereich, durch mehrere sogenannte „Radials“ rund um den Monopol gebildet wird. Diese auf Masse bzw. Erdpotential liegenden Radials gehen vom zentralen Speisepunkt (Fußpunkt) der Antenne radial aus und umfassen in der Regel mindestens drei bis zu mehreren hundert Leitern. Oft wird die Länge dieser Leiter durch die Wellenlänge λ bestimmt, und man wählt vorteilhaft λ/4 als Länge, wenn nur wenige Radials eingesetzt werden. Selbststrahlende Sendemasten im Mittelwellenbereich benutzen z. B. 100 Radials aus verzinkten Stahlbändern, die etwa 60 cm tief im Boden rund um den Sendemast vergraben werden. Monopolantennen werden als Sende- und Empfangsantennen für Längstwelle, Langwelle, Mittelwelle, Kurzwelle bis in den Ultrakurzwellen(VHF)-Bereich eingesetzt. Beispiele für Monopolantennen im VHF-Bereich sind Kfz-Antennen für den UKW-Empfang, wobei statt der Erde die metallische Karosserie als Massefläche dient.allische Karosserie als Massefläche dient. , Antena monopol és un tipus de ràdio antenaAntena monopol és un tipus de ràdio antena que consisteix en un cable conductor muntat més o menys perpendicular sobre una superfície conductora anomenada pla de massa que és sovint el terra (vegeu Fig.1). El senyal a enviar des del transmisor, o el senyal rebut cap al receptor, està entre el pls de massa i el punt més proper del cable (vegeu Fig.2) A diferència de l'antena dipol, que esà formada per 2 cables conductors idèntics. formada per 2 cables conductors idèntics.
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http://dbpedia.org/property/caption One of Marconi's early monopole antennas at his Poldhu, Cornwall transmitting station, 1900, consisting of a small metal plate suspended from a wooden arm with a long wire running down to the transmitter in the building. , Drawing from Marconi's 1896 patent showingDrawing from Marconi's 1896 patent showing his first monopole antennas, consisting of suspended metal plates ' attached to the transmitter ' and receiver ', with the other side grounded '. Later he found that the plates were unnecessary and a suspended wire was adequate.cessary and a suspended wire was adequate. , Marconi's first monopole transmitter
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http://dbpedia.org/property/image Marconi's first radio transmitter.jpg , US patent 586193 Marconi TRANSMITTING ELECTRICAL SIGNALS Dec 7 1896 fig 10&11.png , Marconi transmitting station Poldhu Cornwall 1900.jpg
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rdfs:comment Se denomina monopolo vertical a un tipo deSe denomina monopolo vertical a un tipo de antena (receptora o transmisora) que es la mitad de un dipolo vertical. Cuando el monopolo vertical se instala sobre un , según la teoría óptica de antenas, puede ser modelada como un clásico dipolo. El dipolo es por definición una antena simétrica respecto de su punto de alimentación central y por ello la denominación de alimentación balanceada, en cambio en el monopolo y el plano de tierra se configura una alimentación de tipo , siendo el "vivo" conectado al monopolo propiamente, y el "retorno" conectado al plano de tierra.el "retorno" conectado al plano de tierra. , Eine Groundplane-Antenne (GPA) (englisch MEine Groundplane-Antenne (GPA) (englisch Monopole antenna), kurz auch als Groundplane (GP) bezeichnet, eigentlich Monopolantenne, auch Viertelwellenstrahler, Stabantenne oder, nach ihrem Erfinder Guglielmo Marconi, Marconi-Antenne genannt, ist eine Vertikal-Antenne, bestehend aus einem vertikalen Stab oder selbststrahlenden Mast.rtikalen Stab oder selbststrahlenden Mast. , A monopole antenna is a class of radio antA monopole antenna is a class of radio antenna consisting of a straight rod-shaped conductor, often mounted perpendicularly over some type of conductive surface, called a ground plane.The driving signal from the transmitter is applied, or for receiving antennas the output signal to the receiver is taken, between the lower end of the monopole and the ground plane. One side of the antenna feedline is attached to the lower end of the monopole, and the other side is attached to the ground plane, which is often the Earth. This contrasts with a dipole antenna which consists of two identical rod conductors, with the signal from the transmitter applied between the two halves of the antenna.ied between the two halves of the antenna. , Monopol, på engelska monopole, en typ av aMonopol, på engelska monopole, en typ av antenn, ibland i form av ett torn som fungerar som antenn (självstrålande mast). Ordet används ibland även om torn som bär antenner, strålkastare, m.m. Ordet är en sammansättning, som uttalas med o-ljud i slutstavelsen. Monopoler som antennbärare har blivit mer populära i och med utbyggnaden av tredje generationens mobiltelefoninät, UMTS. En variant av monopolen är monopoden, vilket är en monopol med inbyggt teknikutrymme i konstruktionens bas. Den sistnämnda lösningen är mindre vanlig i Sverige.mnda lösningen är mindre vanlig i Sverige. , Antena monopol és un tipus de ràdio antenaAntena monopol és un tipus de ràdio antena que consisteix en un cable conductor muntat més o menys perpendicular sobre una superfície conductora anomenada pla de massa que és sovint el terra (vegeu Fig.1). El senyal a enviar des del transmisor, o el senyal rebut cap al receptor, està entre el pls de massa i el punt més proper del cable (vegeu Fig.2) A diferència de l'antena dipol, que esà formada per 2 cables conductors idèntics. formada per 2 cables conductors idèntics. , De Marconi-antenne is genoemd naar haar uiDe Marconi-antenne is genoemd naar haar uitvinder Guglielmo Marconi en wordt gevoed met een ongebalanceerde voedingslijn zoals een coaxkabel. Ze bestaat uit een 1/4 λ driven-element verbonden met de kern van de coax geplaatst direct boven een perfect grondvlak zoals een moeras waarbij de mantel van de coax met een aardingspen van willekeurige lengte wordt verbonden. De impedantie aan de connector is ~50Ω. De antenne steunt op het principe waarbij een perfect grondvlak (goede geleider) het driven-element reflecteert waardoor in feite een dipool ontstaat.ert waardoor in feite een dipool ontstaat.
rdfs:label Groundplane-Antenne , Marconi-antenne , Antena monopol , Monopole antenna , Monopol (torn) , Monopolo vertical
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