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A choke ring antenna is a particular form of omnidirectional antenna for use at high frequencies. It consists of a number of conductive concentric cylinders around a central antenna. Due to its delicate construction, it is often enclosed in a protective cover or radome when placed outside and exposed to the elements. Choke ring antennas are notable for their ability to reject multipath signals fading from a source. Since the path that a signal takes from a transmitter to receiver can be used to measure the distance between the two, this makes it highly suited for GPS and radar applications. In a GPS ground based receiver, a choke ring antenna can provide millimeter precision measurements〔http://www.trimble.com/infrastructure/gnss-choke-ring-antenna.aspx - Catalog page for a Trimble choke ring antenna.〕 for surveying and geological measurement applications. The choke ring design originated at the Jet Propulsion Laboratory.〔http://www.javad.com/jns/technology/Single-Depth%20Low-Multipath%20Choke%20Ring.html - A basic description of choke ring antenna benefits and limitations.〕 == See also == * Trimble Navigation - a manufacturer of this product. * Patch antenna - another antenna for GPS applications. * Magellan Professional Products - a manufacturer of this product. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Choke ring antenna」の詳細全文を読む スポンサード リンク
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