34 results about "Dielectric antennas" patented technology

A dielectric antenna of the present invention includes a pillar-shaped dielectric section for radiating an electromagnetic wave being fed thereto. The dielectric section includes a depressed portion in an upper portion thereof. The vertical cross section of the depressed portion has such a shape that the height of the dielectric section gradually increases toward the side surface of the dielectric section. For example, the depressed portion is a notch having a V-shaped vertical cross section. Alternatively, the depressed portion includes a flat surface portion.

There is disclosed an antenna device comprising an elongate dielectric radiating element having a longitudinal axis and a feeding mechanism for generating displacement currents in the dielectric radiating element. The radiating element is configured to support displacement current resonance modes parallel to the longitudinal axis but to inhibit displacement current resonance modes transverse to the longitudinal axis.

An integrated antenna device comprising a first, dielectric antenna component (1) and a second, electrically-conductive antenna component (9), wherein the first and second components are not electrically connected to each other but are mutually arranged such that the second component is parasitically driven by the first component when the first component is fed with a predetermined signal.

The invention discloses a low-temperature sintered ZnO-MgO-TiO2 system microwave ceramic material and a preparation method thereof. The formula of raw materials of the ceramic material comprises the following compositions: 30 to 45 percent of zinc oxide, 2 to 14 percent of magnesium oxide, 50 to 60 percent of titania and an auxiliary sintering agent. The preparation method comprises: taking the zinc oxide, basic magnesium carbonate and the titania as raw materials, mixing the raw materials, adding a grinding aid for ball milling, drying, sieving and presintering, and obtaining clinker; and mixing the obtained clinker with the titania, the auxiliary sintering agent and an additive, performing drying, granulation and press forming after secondary ball milling, finally sintering the mixture for 2 to 8 hours at a temperature of between 900 DEG C and 1,000 DEG C, and obtaining the ceramic material. The ceramic material prepared by the method has the advantages of superior microwave dielectric property, low sintering temperature, low cost and the like, and is suitable for microwave devices such as multi-layer ceramic capacitors, filters, resonators and dielectric antennas.

An object of this invention is to provide an LED illumination device that can substitute for a fluorescent light and obtain uniform light with high efficiency. The LED illumination device comprises an LED with a thin-plate-shaped semiconductor element body transmitting the light generated in a PN junction area in a thickness direction and emits it from the surface, a surface electrode that covers the surface of the semiconductor element body, and columnar dielectric antennas that penetrate the surface electrode in the thickness direction and that condense the light transmitted in a body of the semiconductor element and emit it outside, a diffraction member that is arranged on a luminous surface side of the LED and that diffracts and disperses the light emitted by the LED, and a diffusion member that is arranged outside the diffraction member and that diffuses the light dispersed by the diffraction member and emits it outside.

A dielectric antenna with an electromagnetic feed element (2) and with a lens (3) made of a dielectric material, the feed element (2) emitting electromagnetic radiation (4) and the lens (3) being supplied with electromagnetic radiation (4) in the feed region (5), the lens (3) relaying the electromagnetic radiation (4) and radiating it with the transmission region (6). To configure these dielectric antennas such that the disadvantages of the dielectric antennas known from the prior art are at least partially avoided, first of all, the lens (3) is shaped essentially ellipsoidally at least in the transmission region (6) and the lens (3) is arranged relative to the feed element (2) such that the electromagnetic radiation (4) emitted by the lens (3) in the direction of maximum radiation (7) of the antenna has an essentially planar phase front.

The invention provides a flexible microwave device and a preparation method thereof. The device includes a flexible waveguide and flexible ferrite films; the flexible ferrite films are formed on the upper surface of the flexible waveguide. The surface of the flexible waveguide is provided with two parallel S-shaped channels, the flexible ferrite films are located in the middles of the S-shaped channels, and one end of each S-shaped channel is externally connected with an electromagnetic wave generator. The flexible microwave device is simple in structure, small in size, low in cost and good inperformance, can be used for preparing flexible microwave signal processing devices such as isolators, circulators, phase shifters, diplexers, filters, microwave dielectric antennas and ferrite switches, and has important application prospects in microwave communication, the Internet of Things, intelligent household appliances and other fields.

A high dielectric antenna substrate and antenna thereof are provided. The substrate includes a first dielectric layer having a first dielectric constant, and a second dielectric layer having a second dielectric constant. The second dielectric layer is formed on one surface of the first dielectric layer. The second dielectric constant is lower than the first dielectric constant. Furthermore, a first metal layer and a second metal layer are optionally formed on the same surface or two surfaces of the first dielectric layer to compose a capacitor.

The present invention discloses a microwave dielectric ceramic material with a medium dielectric constant, and a preparation method thereof. The preparation method comprises: mixing the following raw powders according to a chemical formula of Ca4La2Ti5-x(Mg1/3Nb2/3) xO17, wherein the raw powders comprise CaCO3, (MgCO3)4.Mg(OH)2.5H2O, TiO2, La2O3 and Nb2O5, the purities of the raw powders are more than 99%, x is more than or equal to 0, and less than or equal to 4; carrying out wet milling and mixing for 12-24 hours, wherein absolute alcohol is adopted as a solvent; drying, and then pre-burning for 4-6 hours at a temperature of 1300 DEG C under air atmosphere; adding an aqueous solution containing 3% of polyvinyl alcohol (PVA) to the pre-burned powders, then mixing and drying; carrying out screening through a sieve with 100 meshes, and pelletizing; pressing into a cylindrical sample under pressure of 100 MPa; finally sintering for 4 hours at the temperature of 1480-1560 DEG C under air atmosphere to obtain the microwave dielectric ceramic material. According to the present invention, the prepared microwave dielectric ceramic has a high-frequency dielectric constant epsilonr of 34-72, high quality factor Q*f and small frequency temperature coefficient tauf, and can be widely used in dielectric resonators, filters, dielectric antennas and other microwave devices.

A high dielectric antenna substrate includes a first dielectric layer having a first dielectric constant, and a second dielectric layer having a second dielectric constant. The second dielectric layer is formed on one surface of the first dielectric layer. The second dielectric constant is lower than the first dielectric constant. Furthermore, a first metal layer and a second metal layer are optionally formed on the same surface or two surfaces of the first dielectric layer to compose a capacitor.

A fluorescent-lamp-type LED lighting device includes an LED (3) including a thin plate-like semiconductor element body (31) for transmitting light generated in a PN junction region (34) in the thickness direction for emitting from a surface, a surface electrode (32) provided to cover the surface of the element body (31) and a plurality of cylindrical dielectric antennas (36) for condensing the light which has passed through the surface electrode (32) in the thickness direction and transmitted through the inside of the element body (31) and emitting it outside, and a resin-made elongate exterior casing (2) having translucency. The LED (3) is provided at both ends of the exterior casing (2) or along its longitudinal direction. The lighting device is structured to shed the light emitted from the LED (3) outside through the exterior casing (2), has a large light quantity and can substitute for a highly efficient existing lighting device.

The invention discloses a high dielectric constant microwave dielectric material added with strontium oxide and a preparation method and an application thereof. The general formula of the material is Bax(Li0.5Sm0.5)yZrx+yO3(x+y)+zWt.% SrO, wherein x is greater than or equal to 0.75 but less than or equal to 0.85, y is greater than or equal to 0.15 but less than or equal to 0.25, z represents that SrO is added in percentages by mass, and z is greater than or equal to 0.06 but less than or equal to 0.08. The preparation method comprises the steps: mixing; pre-sintering; ball-milling again; granulating; forming; rubber discharging; and sintering. The dielectric constant epsilon r of the material disclosed by the invention is 125.8-152.6 which can be adjusted in a certain range; Q*f0 is 3656-3820GHz, and the temperature coefficient of frequency tau is [(-8.5)-(+53.8)]*10<-6>/ DEG C which can be adjusted in a certain range. As the material disclosed by the invention has the high dielectric constant and both the dielectric constant and the temperature coefficient of frequency can be adjusted in a certain range, the material is particularly suitable for being used for dielectric antennas.

The invention discloses an aluminate-based low-dielectric microwave dielectric ceramic and a preparation method thereof. The main crystal phase of the microwave dielectric ceramic has a garnet type crystal structure, the specific chemical composition is (2+x)CaO-0.5Ln2O3-(2-y)ZrO2-(x+y)MO2-1.5Al2O3, Ln is Y, La, Lu, Gd or other lanthanide elements, M is Hf, Sn or Ti, x is more than or equal to 0 and less than or equal to 0.5, and y is more than or equal to 0 and less than or equal to 2.0. The dielectric constant of the microwave dielectric ceramic ranges from 10.81 to 13.52, the quality factor ranges from 72441 GHz to 121930 GHz, and the temperature coefficient of resonance frequency ranges from +0.50 ppm/DEG C to -35.48 ppm/DEG C. In the preparation process, the pre-sintering condition of the ceramic material is that the temperature is kept at 1300 DEG C for 5 hours, and the sintering condition is that the temperature is kept at 1500-1600 DEG C for 10 hours. The microwave dielectric ceramic prepared in the invention has the characteristics of low dielectric constant, high quality factor and adjustable resonant frequency temperature coefficient to near zero, and is suitable for preparing microwave communication devices such as dielectric substrates, dielectric resonators, dielectric antennas and the like.