1 edition of Investigation of Conformal High-Impedance Ground Planes found in the catalog.
Investigation of Conformal High-Impedance Ground Planes
by Storming Media
Written in English
|The Physical Object|
Characteristics. The J-pole antenna is an end-fed omnidirectional half-wave antenna that is matched to the feedline by a quarter wave parallel transmission line stub of Lecher system form. Matching to the feed-line is achieved by sliding the connection of the feedline back and forth along the stub until an impedance match is obtained. Being a half-wave antenna, it provides a small gain over a. A high-impedance ground plane applied to a cellphone handset geometry Abstract: A high-impedance electromagnetic surface is a new type of metallic structure exhibiting high surface impedance and the suppression of propagating surface currents at a particular frequency band. We experimentally characterize such a high-impedance surface designed.
Until now we have assumed that a conformal mapping that rectifies the boundary in the 2D case, or the contour that represents the beam cross section in the 3D case, is known. A function performing the mapping of a canonical domain in the w-plane (the interior or exterior of the unit circle, the upper half-plane, and so forth) onto a domain of interest in the (x, y)-plane covers that domain by. ) The Design Optimization of Antennas in the Presence of EBG AMC Ground Planes by D. J. Kern, T. G. Spence, and D. H. Werner ABSTRACT: A design methodology is presented for the optimization of conformal antennas with Electromagnetic Bandgap (EBG) surfaces to improve antenna performance.
This dissertation shows a detailed investigation on reconfigurable low profile antennas using tunable high impedance surfaces (HIS). The specific class of HIS used in this dissertation is called a frequency selective surface (FSS). This type of periodic structure is fabricated to create artificial magnetic conductors (AMCs) that exhibit properties similar to perfect magnetic conductors (PMCs). investigation of correlations in quantum eld theories. In particular, in 1+1 space-time dimensions, the spectra of entanglement Hamiltonians of conformal eld theories (CFTs) for certain geometries are related to the spectra of the physical Hamiltonians of corresponding boundary CFTs. As a result, conformal invariance allows exact.
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Two newly reported high-impedance ground planes have potential to begin the realization of the applique antenna vision and each is investigated for use with thin conformal antenna structures. The realization and performance is demonstrated of a conformal bow-tie antenna printed on a multi-scale triangular element mushroom structure high-impedance ground-plane (HIGP).
We demonstrate the realization and performance of a conformal bow-tie antenna printed on a multi-scale triangular element mushroom structure high-impedance ground-plane (HIGP). The two-scale HIGP was designed to exhibit a large frequency band-gap to cover the relatively broad operational frequency bandwidth of the bow-tie antenna.
We present two low-profile bow-tie antenna designs printed conformally on high-impedance ground planes (HIGPs). The HIGPs were constructed using two different scale triangular patch mushroom elements which allowed for a commensurate platform for the active bow-tie antenna.
The multi-scale nature of the HIGP was utilized to further increase the frequency band-gap of the surface waves, and.
Motivated and inspired by the notion of high-impedance ground planes in the radio frequency regime, we have developed an optical version of this concept for enhancing optical emission. This book presents a comprehensive EM design and analysis of such low-profile patch arrays with high impedance surface-based ground plane.
It explains how to determine Investigation of Conformal High-Impedance Ground Planes book mode RCS of low-profile antenna arrays with arbitrary configurations. Broadband Application of High Impedance Ground Planes.
1Lt Daniel Richards GEM (Completed Mar 00) Non-uniformly Spaced Array Elements. 2Lt Michael Saville GEM (Completed Mar 00) Investigation of Conformal, High Impedance Ground Planes. Capt Grayson Cochran GEM (Completed Mar 99).
One way to realize a low-profile antenna design is to use a high impedance ground plane in place of the conventional metallic ground plane. High impedance surfaces (HISs), which can essentially be.
Abstract: We have designed a conformal end-fire antenna, where the dipole antenna is placed close to the ground plane. A 5times5 SRR array has been designed to provide the high impedance shielding from the ground plane.
The SRR array utilizes the principle of resonance to provide a high impedance ground plane. This chapter presents a review of recent applications of HIS at microwave frequencies and the use of HIS as ground planes for low-profile wire-type antennas.
It provides several examples of the use of a mushroom-type HIS and a thin conformal EBG surface for mobile handsets. This book presents electromagnetic (EM) design and analysis of dipole antenna array over the high impedance substrate.
Different configurations of HIS are considered for the array design on planar and non-planar high-impedance surface. This is the vertical radiation pattern of a ground plane antenna over a so-called perfect ground. William Orr, Radio Handbook, 22 nd edition, Howard W.
Sams & Co. Inc., Standing Wave Ratio. However, recently reported high impedance ground plane (HIGP) structures offer a possible alternative. Within a limited frequency stopband, the high impedance structures create image currents and reflections that are inphase with a source rather than out-of-phase as for a PEC surface.
Also, the high impedance structures suppress surface waves Author: Keven J. Golla. of TO and quasi-conformal mapping without proof of the property of metric invariance of Maxwell’s equations. In Sections 3–8, we discuss some examples of transformation devices, such as, non-singular invisibility devices, EM concentrators, ground-plane cloak, ﬂattened Luneburg lens, high-resolution.
The results presented here represent the beginning of an investigation of a new class of reactively controlled arrays. The array extends only lambda/2 above the ground plane. Hence, it could find use in applications where a quasi- conformal antenna with a moderate amount of pattern control is needed.
Although fully excited conformal phased arrays are likely to provide better performance than. A conformal embedded wideband metaresonator antenna is proposed for military vehicular applications.
Metamaterials are artificial materials that exhibit plasmonic resonances with subwavelength sizes of metallic structures. Metaresonator antennas use metamaterial structures as radiators to reduce the size of antennas and design multiband antennas. A small-dipole antenna is placed on a high.
As the name indicates the antenna ground plane acts as a simulated ground. It is found that for a monopole antenna like a quarter wavelength vertical, the ground acts as a plane to reflect the radio waves so that an image of the top half of the antenna is seen in the Earth.
It is possible to simulate this function by replacing the real earth. Multi-scale rectangular element mushroom structure high impedance ground plane (HIGP) designed to exhibit larger band gap frequency range to cover greater bandwidth for low profile antenna design. The HIGP's are composed of three different dimensioned rectangular patch mushroom elements for different resonance frequency realization.
The characterizations of the three scaled HIGP varying all. A high impedance fault (HIF) does not have to involve a path to ground and, in fact, whether a ground is involved does not matter to the HIF detector. A high impedance fault can exist between two phase conductors (a tree limb lying across two phase conductors).
The majority of HIFs do involve ground. Air Force Institute of Technology Hobson Way Wright-Patterson Air Force Base, OH Commercial: | DSN:. Matching impedance between ground and power planes helps your design. Although the ground plane has the most important impedance role, both ground planes and power planes appear as low-impedance paths for signals and can help reduce noise in a circuit.
The return signal follows the path of least impedance to the power supply return. As you. This means that we can obtain a very compact ground plane exhibiting the high impedance behaviour in the frequency range we are inter- ested in (around 2 GHz).
4. Cellular phone antenna layout with EBG structures Using these metallizations, a simple and compact two- level structure can be arranged to surround the antenna Fig. 5.The power and ground planes connected to a shorting via.
The amplitude of the input impedance from DC to 1GHz of the power and ground plane structure looking from the pair of the vias at the center is shown in Figure 6. High input impedance no longer exists at the low frequency region, which means that the power and ground plane structure is.