The SelectConnect Laser Direct Structuring (LDS) process for manufacturing 3D-MID. June 2011. As stated in the previous post, one more piece of information is required to complete the puzzle of calculating received field strength. That is the millivolt per meter level at 1 kilometer from the station transmitter, eminating in your direction. Notice I said "eminating in your direction". It is not good enough to simply calculate the mV/m level at 1 kilometer for the station's overall power output. Two things must be accounted for that change that result and would make our field strength calculation inaccurate.
They are: 1. 2. There is only one case where we will need to do a simple extra calculation to arrive at the full millivolt per meter level for a station. So let's put together what we need. 1. 2. 3. Www.wikimapia.org is a great way to determine your home latitude and longitude as it has a crosshair defining the center of the map, and thus the latitude and longitude. The station's latitude and longitude can be found in a couple of ways. 4. mV/m for multiple towers. 1. 2. 3. 4. Feb 13, 2011. A classic dipole antenna is 1/2-l long and fed at the center. The feed-point impedance is low at the resonant frequency, f0, and odd harmonics thereof. The impedance is high near even harmonics. When fed with coax, a classic dipole provides a reasonably low SWR at f0 and its odd harmonics. When fed with ladder line (see Fig 20.8A) and a Transmatch, the classic dipole should be usable near f0 and all harmonic frequencies.
(With a wide-range Transmatch, it may work on all frequencies.) If there are problems (such as extremely high SWR or evidence of RF on objects at the operating position), change the feed-line length by adding or subtracting 1/8 l at the problem frequency. Most dipoles require a little pruning to reach the desired resonant frequency. How much to prune: When assembling the antenna, cut the wire 2 to 3% longer than the calculated length and record the length. Loose ends: Here’s another trick, if you use nonconductive end support lines.
Dipole Orientation Multiband Dipoles. Electromagnetic oscillating circuit. This simulation deals with an electromagnetic oscillating circuit, consisting of a capacitor (center) and an inductor (i.e. a coil, on the right). As soon as you have pressed the "Reset" button, the plates of the capacitor will be charged, namely the upper plate positively and the lower plate negatively. After clicking on the "Start" button with the mouse, the switch will be brought to its other position so that the oscillation will begin. The same button makes it possible to interrupt respectively resume the simulation. The animation will be 10 or 100 times slower than the real oscillation, depending on the selected radio button. The electric field of the capacitor (red) and the magnetic field of the inductor (blue) are indicated by field lines in the circuit diagram.
At the left bottom a digital clock indicates the time since the begin of the oscillation; under there you can read the oscillation period. Physics Simulation with Java. Click on one of the physics simulations below... you'll see them animating in real time, and be able to interact with them by dragging objects or changing parameters like gravity. Get Java software if you don't already have it. The next set of simulations are non-interactive movies. How Does It Work? Explanations of the math and physics are provided in the simulation web pages. Free source code is provided for those wanting to experiment on their own. Here are some additional pages about the underlying math and software. Why Physics Simulation? Simulations are essential in many areas of science and technology.
About Me Hi, my name is Erik Neumann, I live in Seattle, WA, USA, and I am a self-employed software engineer. I was fortunate to get involved in the Macintosh software industry early on in 1985, joining MacroMind (which became Macromedia). I then moved to Seattle and turned my attention back to mathematics and science. Math, Physics, and Engineering Applets. Oscillations and Waves Acoustics Signal Processing Electricity and Magnetism: Statics Electrodynamics Quantum Mechanics Linear Algebra Vector Calculus Thermodynamics Mechanics Miscellaneous Licensing info. Links to other educational sites with math/physics-related information or java applets useful for teaching: And when you get tired of learning, here is some fun stuff: Pong Simulation Circuit-level simulation of original 1972 Pong.
Figure: Parabolic shape eliminates spherical aberration. Amateur Telescope Optics. A Collection of Smith Chart Resources.
閱讀文章. Nanoantennas for ultrafast optical switches - nanotechweb. A new type of ultrafast optical switch based on plasmonic "nanoantennas" has been devised by researchers in Spain, France and the UK. The device switches from being a capacitor to a conductor when exposed to a light beam and consists of two closely spaced metal nanorods with amorphous silicon in the gap between the rods. The switch, which works at ultra-low pumping energies of just picojoules, might find applications in integrated photonic circuits and quantum information devices. Traditional antennas are used to transmit radio and television signals but the concept can be applied to optical frequencies too if the device is scaled down to nanometre scales. This is because antennas work by exploiting oscillating charges along the length of the device, which means that its size must be reduced to fit a resonant mode for the wavelength of electromagnetic radiation it supports.
When light is shone onto the nanoantenna, it goes from being a capacitor to a conductor. Nanoantennas target single particles. Researchers have, for the first time, used a single "nanoantenna" – a device that collects and focuses light – to demonstrate that it could be used to detect particles and atoms. The work, by scientists at the Lawrence Berkeley National Laboratory (LBNL) in the US and the University of Stuttgart in Germany, could be used to make extremely sensitive gas sensors and detectors. Conventional antennas, widely used to transmit radio or TV signals, can be used at optical frequencies if they are shrunk to the nanoscale, which could have potential applications in nanophotonics. The nanoantennas can also be used to generate electronic surface waves known as "surface plasmons".
This is done by confining electromagnetic waves – typically at the interface between metallic nanostructures (usually made of gold) and a dielectric (usually air) – that have dimensions smaller than half the wavelength of incident light. Many applications The findings were detailed in Nature Materials. Patent US5567537 - Magnetic core element for antenna, thin-film antenna, and card equipped with ... - Google Patents. The present invention will be described in detail below. [A]Magnetic Core Element The magnetic core element of the present invention is made of an amorphous alloy strip or a nano-crystalline alloy strip. The amorphous alloy has-a chemical composition represented by the formula: (Co.sub.1-a Fe.sub.a).sub.100-b-c-d-e T.sub.b Si.sub.c B.sub.d Y.sub.e(1) In the formula (1), T is at least one element selected from the group consisting of Mn, Ni, Ti, Zr, Hf, Cr, Mo, Nb, W, Ta, Cu, Ru, Rh, Pd, Os, Ir, Pt, Re and Sn. Y is at least one element selected from the group consisting of C, Ge, Ga, P and Al.
The numerical value, a, representing the composition ratio of Fe is preferably 0≦a≦0.1, more preferably 0.01.ltoreq.a.ltoreq07. The Si (silicon) content (c), the B (boron) content (d) and the sum of these contents (c+d) are 0≦c≦20, preferably 10≦c≦20, 5≦d≦25, preferably 5≦d≦10 and 15≦c+d≦30 each in terms of atomic %, respectively. In the formula (2), M is Co, Ni or a combination thereof. Patent US7154447 - Nanocrystalline core antenna for EAS and RFID applications - Google Patents.
The present invention relates to core antennas, and, in particular, to core antennas for electronic article surveillance (EAS) and radio frequency identification (RFID) systems. EAS and RFID systems are typically utilized to protect and/or track assets. In an EAS system, an interrogation zone may be established at the perimeter, e.g. at an exit area, of a protected area such as a retail store. The interrogation zone is established by an antenna or antennas positioned adjacent to the interrogation zone.
EAS markers are attached to each asset to be protected. An RFID system utilizes an RFID marker to track articles for various purposes such as inventory. Historically, transmitting, receiving, or transceiver antennas in EAS and RFID systems have been configured as loop-type antennas. Ferrite material may be provided as a powder, which is blended and compressed into a particular shape and then sintered in a very high temperature oven. Patent US7659858 - Antenna and electronic device - Google Patents. The present application is a Continuation application of U.S. application Ser.
No. 11/238,034 filed Sep. 28, 2005 now U.S. Pat. No. 7,355,556, which is based upon and claims the benefit of priority from prior Japanese Patent Applications No. 2004-287860, filed Sep. 30, 2004; No. 2004-300205, filed Oct. 14, 2004; No. 2005-153916, filed May 26, 2005; and No. 2005-155213, filed May 27, 2005, the entire contents of all of which are incorporated herein by reference. 1. The present invention relates to an antenna and an electronic device which receive radio waves. 2. A radio-wave clock is known as an electronic device which receives a radio wave (hereinafter referred to as the “standard radio wave”) carrying a standard time signal thereon with a built-in antenna and which analyzes time information by a standard radio-wave signal inside the electronic device to correct present timing and precisely keep time.
The core 110 is a rod member, and each end surface 110B is circular. Patent US5220339 - Antenna having a core of an amorphous material - Google Patents. Actual performances of antennas of this invention are introduced thereunder in comparison with conventional antennas. In this Example, amorphous fiber (made by Unitica, Co., Ltd., JAPAN under the tradename of Sency AC-20, 125 micron m in diameter) was used core material. Type and magnetic properties are as follows: Type: Co--Fe--Si--B Maximum magnetic permeability μmax: approx. 100,000 Saturation magnetic flux density Bs(KG): 8 Coercive force Hc * (Oe): 0.06 Remaining magnetic flux density Br*(KG): 4 Magnetostriction λs Curie temperature Tc ( Fifty (50) strings of amorphous fibers with 460 mm in length are bound in a solid cylindrical core (1a) and a alumina wire (2a) (1 mm in diameter and surface coated) are used to form antenna element (3) in FIG. 1.
Then the above antenna element (3) was held between rubber mats (4) (460 mm in length, 25 mm in width, 2 mm in thickness) and fixed by polyvinyl chloride tape (5), to form a flat antenna to be set on the surface of automobile body plate. 1. 2. 智慧辨識服務資訊網. Patent US7961154 - Antenna with near-field radiation control - Google Patents. This application is a continuation of U.S. application Ser.
No. 11/774,383, which was filed on Jul. 6, 2007 (now U.S. Pat. No. 7,541,991), which is a continuation of U.S. application Ser. No. 10/940,869, which was filed on Sep. 14, 2004 (now U.S. Pat. No. 7,253,775), which is a continuation of U.S. application Ser. No. 10/317,659, filed on Dec. 12, 2002 (now U.S. This invention relates generally to the field of antennas.
Many different types of antenna for mobile devices are known, including helix, “inverted F”, folded dipole, and retractable antenna structures. According to an aspect of the invention, an antenna comprises a first conductor section electrically coupled to a first feeding point, a second conductor section electrically coupled to a second feeding point, and a near-field radiation control structure adapted to control characteristics of near-field radiation generated by the antenna. is a top view of an antenna according to a first embodiment of the invention. Patent US8018386 - Multiple-element antenna with floating antenna element - Google Patents. This application is a continuation of application Ser. No. 11/590,200, filed on Oct. 31, 2006 now U.S. Pat. No. 7,400,300, which is a continuation of application Ser. No. 10/864,145, filed on Jun. 9, 2004, now U.S. Pat. No. 7,148,846.
This invention relates generally to the field of antennas. Mobile communication devices (“mobile devices”) having antenna structures that support communications in multiple operating frequency bands are known. A multiple-element antenna in accordance with another aspect of the invention, for use with a wireless mobile communication device having a transceiver and a receiver, comprises a single dielectric substrate, a first antenna element on the dielectric substrate having a feeding port connected to the transceiver and the receiver, and a floating antenna element on the dielectric substrate and positioned adjacent the first antenna element on the single dielectric substrate to electromagnetically couple with the first antenna element. Dipole Antenna Radiation Pattern. Dipole antenna. Schematic of a (balanced) half-wave dipole antenna connected to an unbalanced coaxial cable.
Several different variations of the dipole are also used, such as the folded dipole, short dipole, cage dipole, bow-tie, and batwing antenna. Dipoles may be used as standalone antennas themselves, but they are also employed as feed antennas (driven elements) in many more complex antenna types,[3][4] such as the Yagi antenna, parabolic antenna, reflective array, turnstile antenna, log periodic antenna, and phased array. The dipole was the earliest type of antenna; it was invented by German physicist Heinrich Hertz around 1886 in his pioneering investigations of radio waves. Elementary doublet[edit] Elementary doublet. From a theoretical point of view, the dipole antenna is the simplest antenna type. Here ω = 2πf is the angular frequency (and f the frequency), and i = √−1 is the imaginary unit, so that I is a phasor. Radiation resistance and aperture[edit] where Z0 is the impedance of free space.
Where. 3D printing method advances electrically small antenna design | Engineering at Illinois. While most electronic components benefit from decreased size, antennas—whether in a cell phone or on an aircraft—suffer limitations in gain, efficiency, system range, and bandwidth when their size is reduced below a quarter-wavelength. (l to r) Postdoctoral researcher Jacob Adams with principal investigators Jennifer Bernhard and Jennifer Lewis. “Recent attention has been directed toward producing antennas by screen-printing, inkjet printing, and liquid metal-filled microfluidics in simple motifs, such as dipoles and loops,” explained Jennifer T. Bernhard, a professor of electrical and computer engineering at Illinois. “However, these fabrication techniques are limited in both spatial resolution and dimensionality, yielding planar antennas that occupy a large area relative to the achieved performance.” “To our knowledge, this is the first demonstration of 3D printed antennas on curvilinear surfaces,” Lewis stated.
Optical image of an antenna during the printing process. Jennifer A. Pasta-Shaped Radio Waves Do The Twist. The Pasta-Shaped Radio Waves That Promise Infinite Bandwidth. Terahertz filter. Fractal Metamaterial Wideband Invisibility Cloak. Semiconductor structure bends light 'wrong' way. Magnetic Mount Antennas are Electrical Performers. 用於高頻器件的人工磁性體不使用稀土族與磁鐵，山口大學驗證其實現可能性. Photos of a Prototype MacBook Pro with Integrated 3G Cellular Modem. Solve for X: Anthony Sutera on low power wireless everywhere. Tin dioxide nanoparticle based sensor integrated with microstrip antenna for passive wireless ethylene sensing.
Google 搜尋 圖片的結果. Spray-On Antenna. The Spray-On Antenna That Boosts Reception Using Zero Power. Laptop with air ionizer. 國立中山大學天線實驗室 NSYSU Antenna Lab. Mobile Communication Device Antenna Patents Database. 電子學位論文服務. 高科技的隱形術──「有形無影」的新武器時代. Liquid antennas turn seawater into signal. Shape-changing liquid metal antenna could lead to responsive electronic devices. Liquid Antenna | Symmetry Wireless - Revolutionary Wireless Technologies. Development of the Liquid Metal Antenna. Electrolytic Fluid Antenna replaces metal with jets of water. ElectroDynamic Applications, Inc. | Communication through Plasma. Introduction to Antennas. 微型化天線設計趨勢與技術 - Hugo是雨果不是愚狗，有問題就問我弟-顧狗(Google) Internal/Embedded Antenna Technology Ethertronics :: Technology Overview. 成大研發快訊 - 文摘【第十七卷 第六期】
Digital Studio Lange. Antenna Definitions.