Topic
Dielectric resonator antenna
About: Dielectric resonator antenna is a research topic. Over the lifetime, 8199 publications have been published within this topic receiving 111090 citations. The topic is also known as: DRA.
Papers published on a yearly basis
Papers
More filters
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11 Mar 1992
TL;DR: In this article, a dual-mode microstrip resonator is proposed to provide paths for a pair of orthogonal signals which are coupled together using a perturbation located in at least one corner of the resonator.
Abstract: A dual mode microstrip resonator (1) usable in the design of microwave communication filters. The substantially square resonator (1) provides paths for a pair of orthogonal signals which are coupled together using a perturbation located in at least one corner of the resonator (1). The perturbation can be introduced by notching (3) the resonator (1) or by adding a metallic or dielectric a stub (83) to the resonator (1).
34 citations
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27 Jan 1994TL;DR: In this article, a cylindrical dielectric resonator (40) is supported by a spacer (58) above a ground plane (14) and dielectrical substrate (12), and a first microstrip transmission line includes a strip conductor (22) coupled at one end to the coupled 0° port, and extending parallel to a tangent to the edge of the resonator at a central plane (44), terminating in an open-circuit (226).
Abstract: A notch filter includes a directional coupler (16) with an input port (17a), coupled output port (17b), coupled 0° (17d) and direct 90° (17c) ports. A cylindrical dielectric resonator (40) is supported by a spacer (58) above a ground plane (14) and dielectric substrate (12). A first microstrip transmission line includes a strip conductor (22) coupled at one end to the coupled 0° port, and extending parallel to a tangent to the edge of the resonator at a central plane (44), terminating in an open-circuit (226). A second transmission line includes a strip conductor (24) coupled to the direct 90° port (17c) and extending parallel to the first transmission line, on the other side of the resonator. The first and second transmission lines each have an electrical length λ/4 between the central plane (44) and their open-circuit terminations, to reflect a high current to the plane. The high current represents maximum transmission line current, for maximizing coupling to the resonator. An offset metal plunger generates a higher-order mode, which is combined with the fundamental to improve rejection at the notch.
34 citations
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31 Jul 2003
TL;DR: In this article, a vertical mode free-free beam resonator with a movable beam that overlies a drive electrode is described, supported by a plurality of supports, the length of which is substantially less than one-quarter of a wavelength of the resonant frequency.
Abstract: The illustrative embodiment of the present invention is a vertical-mode, free-free beam resonator, and micromechanical circuits that include one or more such resonators. In accordance with the illustrative embodiment, the resonator comprises a movable beam that overlies a drive electrode. The movable beam is supported by a plurality of supports, the length of which is substantially less than one-quarter of a wavelength of the resonant frequency of the resonator.
34 citations
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24 Jul 2003
TL;DR: In this paper, an ultra-wideband antenna for operating in a frequency is disclosed wherein a monopole antenna extends from a ground plane and has an effective length L of one quarter wavelength at the lowest frequency f 1.
Abstract: An ultra-wideband antenna for operating in a frequency is disclosed wherein a monopole antenna extends from a ground plane. The monopole has an effective length L of one quarter wavelength at the lowest frequency f 1 . A dielectric resonator antenna (DRA) surrounds the monopole antenna for resonating at substantially between or at two and three times the lowest frequency f 1 . the DRA is of a height of less than ¾ L and is disposed in such a manner as being above the ground plane and either contacting or spaced therefrom by a gap G, wherein 0≦G≦0.2 H. The ultra-wideband antenna is of a much greater bandwidth than the sum of bandwidth of the monople or the DRA alone.
34 citations
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03 Mar 2000TL;DR: A band switching filter as discussed by the authors is a circuit consisting of a surface acoustic wave resonator, a switching element and an impedance element, which selectively passes or attenuates a signal through one of two pass bands using a single filter.
Abstract: A band switching filter includes a resonator circuit having a surface acoustic wave resonator, a switching element and an impedance element. The filter selectively passes or attenuates a signal through one of two pass bands using a single filter. The resonant frequency of the resonator circuit can be shifted to another frequency by selectively connecting the surface acoustic wave resonator to an impedance element using a switching element.
34 citations