Topic
Feed line
About: Feed line is a research topic. Over the lifetime, 5231 publications have been published within this topic receiving 53539 citations.
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Patent•
AT&T1
TL;DR: In this paper, the authors describe an antenna structure having a feed point for coupling to a dielectric core of a cable that propagates electromagnetic waves without an electrical return path.
Abstract: Aspects of the subject disclosure may include, for example, an antenna structure having a feed point for coupling to a dielectric core of a cable that propagates electromagnetic waves without an electrical return path, and a dielectric antenna, substantially or entirely devoid of conductive external surfaces, coupled to the feed point, the dielectric antenna facilitating receipt, at the feed point, the electromagnetic waves for propagating the electromagnetic waves to an aperture of the dielectric antenna for radiating a wireless signal. Other embodiments are disclosed.
260 citations
Patent•
12 May 1994
TL;DR: In this article, a tunable microwave ablation catheter system is described, which matches the impedance of its power supply with the transmission line to minimize reflected power and optimize energy delivery to targeted tissue.
Abstract: A tunable microwave ablation catheter system (20) is disclosed which matches the impedance of its power supply with the transmission line to minimize reflected power and optimize energy delivery to targeted tissue. The tuner (30) itself may be located in the power supply (22), the transmission line or the antenna (53). Tuner mechanisms at these locations can change the antenna configurations, move material relative to the antenna (53), or alter the waveguide (50). A controller (35) monitors the catheter system operation. A method of medical treatment is disclosed where the impedances of the components of the systems are adjusted during use to compensate for impedance variations.
241 citations
TL;DR: In this paper, a microstrip antenna on a micromachined 635-/spl mu/m thick substrate was used to synthesize a localized low dielectric-constant environment.
Abstract: Micromachining techniques using closely spaced holes have been used underneath a microstrip antenna on a high dielectric-constant substrate (/spl epsiv//sub r/=10.8) to synthesize a localized low dielectric-constant environment (/spl epsiv//sub r/=2.3). The measured radiation efficiency of a microstrip antenna on a micromachined 635-/spl mu/m thick /spl epsiv//sub r/=10.8 Duroid 6010 substrate increased from 48/spl plusmn/3% to 73/spl plusmn/3% at 12.8-13.0 GHz (including 3.3-cm feed line losses). We believe that this technique can be applied to millimeter-wave antennas (microstrip, dipoles, slots, etc.) on silicon and GaAs substrates to result in relatively wideband (3-6%) monolithic microwave integrated circuits (MMIC) active antenna modules for phased-arrays and collision-avoidance systems.
231 citations
Patent•
TDK1
TL;DR: In this paper, an antenna structure consisting of a ground plane, a feed line and at least one resonator element is designed to be embedded in a dielectric substrate and which is meandering in shape such that it includes at least two adjacent resonator segments.
Abstract: An antenna structure comprising a ground plane, a feed line and at least one resonator element that is embedded in a dielectric substrate and which is meandering in shape such that it includes at least two adjacent resonator segments. As a result, the resonator element resonates in two separate frequency bands. A second resonator element is preferably provided, the second resonator element being dimensioned to resonate in a frequency band located on one side of a third operating frequency band, the feed line and ground plane being arranged to cause a resonance in a frequency band located on the other side of the third operating frequency band. During use, the combined effect of the resonance of the second resonator element and of the feed line and ground plane is to cause the antenna structure to resonate in the third operating frequency band.
224 citations
Patent•
13 Sep 2000
TL;DR: A phased array antenna includes a plurality of radiating elements, a feed line assembly, and a ground plane positioned between the radiating element and the feed line, with the ground plane having a plurality opening positioned between radiating and feed line assemblies and a voltage tunable dielectric phase shifters coupled to the feedline assembly as mentioned in this paper.
Abstract: A phased array antenna includes a plurality of radiating elements, a feed line assembly, a ground plane positioned between the plurality of radiating elements and the feed line assembly, with the ground plane having a plurality of openings positioned between the plurality of radiating elements and the feed line assembly, and a plurality of voltage tunable dielectric phase shifters coupled to the feed line assembly.
224 citations