Resonance - Revision history

Carlb at 01:19, 9 April 2009

2009-04-09T01:19:13Z

← Older revision		Revision as of 18:19, 8 April 2009
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	Possible solutions to this problem are to use a "thicker" element, or to use a different antenna type.		Possible solutions to this problem are to use a "thicker" element, or to use a different antenna type.


			{{electronics}}

G7VRD: Antenna -> Antennas

2008-07-12T16:19:21Z

Antenna -> Antennas

← Older revision		Revision as of 09:19, 12 July 2008
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	{{Template:Stub}}		{{Template:Stub}}

	Related wiki pages: [[~~Antenna~~]], [[capacitors\|capacitance]], [[inductors\|inductance]]		Related wiki pages: [[Antennas]], [[capacitors\|capacitance]], [[inductors\|inductance]]

	An antenna is a type of tuned circuit consisting of both [[capacitors\|capacitance]] and [[inductors\|inductance]]. At resonance, capacitive and inductive ~~impedace~~ are equally balanced - in a sense ~~cancelling~~ each other out. At this point the antenna appears to be entirely ~~resisitive~~. The apparent resistance is a combination of loss resistance (for example in the feedlines and antenna elements) and radiation ~~resisitance~~.		An antenna is a type of tuned circuit consisting of both [[capacitors\|capacitance]] and [[inductors\|inductance]]. At resonance, capacitive and inductive impedance are equally balanced - in a sense canceling each other out. At this point the antenna appears to be entirely resistive. The apparent resistance is a combination of loss resistance (for example in the feedlines and antenna elements) and radiation resistance.

	[[Image:Vk4yeh_antenna_resonance.jpg\|600px]]		[[Image:Vk4yeh_antenna_resonance.jpg\|600px]]

	The inductance and capacitance of an antenna are determined by a number of factors, including construction materials, height above earth, and its dimensions. Of these, dimensions are usually the major feature affecting ~~reonant~~ frequency. For example, operating on [[HF]] requires an antenna with much larger elements that when operating on [[VHF]].		The inductance and capacitance of an antenna are determined by a number of factors, including construction materials, height above earth, and its dimensions. Of these, dimensions are usually the major feature affecting resonant frequency. For example, operating on [[HF]] requires an antenna with much larger elements that when operating on [[VHF]].

	Ideally, antennas are operated close to their resonant frequency. However, this would effectively result in a limited bandwidth being available for use.		Ideally, antennas are operated close to their resonant frequency. However, this would effectively result in a limited bandwidth being available for use.

	Possible solutions to this problem are to use a "thicker" element, or to use a different antenna type.		Possible solutions to this problem are to use a "thicker" element, or to use a different antenna type.

TimVK4YEH: added brief intro to resonance and impedance/frequency graph - stub

2008-07-06T21:55:59Z

added brief intro to resonance and impedance/frequency graph - stub

New page

{{Template:Stub}}

Related wiki pages: [[Antenna]], [[capacitors|capacitance]], [[inductors|inductance]]

An antenna is a type of tuned circuit consisting of both [[capacitors|capacitance]] and [[inductors|inductance]]. At resonance, capacitive and inductive impedace are equally balanced - in a sense cancelling each other out. At this point the antenna appears to be entirely resisitive. The apparent resistance is a combination of loss resistance (for example in the feedlines and antenna elements) and radiation resisitance.

[[Image:Vk4yeh_antenna_resonance.jpg|600px]]

The inductance and capacitance of an antenna are determined by a number of factors, including construction materials, height above earth, and its dimensions. Of these, dimensions are usually the major feature affecting reonant frequency. For example, operating on [[HF]] requires an antenna with much larger elements that when operating on [[VHF]].

Ideally, antennas are operated close to their resonant frequency. However, this would effectively result in a limited bandwidth being available for use.

Possible solutions to this problem are to use a "thicker" element, or to use a different antenna type.