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Although the proposed antenna does not completely fulfill the10 dB matching requirement of the ECC UWB band entirely, it qualifies itself as a good candidate for UWB applications requiring radiation to one side only. The antenna's high gain makes it suitable for directional radio systems, e.g. in the medical field for communication with a pacemaker implant. For this purpose, further investigations...
This paper develops and applies a complete channel model for MIMO in aircraft that includes the effects of noise, interference and channel correlation. Clarke's, hyper-Rayleigh, IEEE TGn and an advanced ray-tracing model were used to predict the channel effects. Gaussian noise, thermal noise (at the transmitter and the receiver), non-Gaussian noise, and the aircraft system noise were included as well...
Mutual coupling reduction technique using novel soft surface structures has been investigated. Conventional soft surface structures are made on the ground plane of the antenna. But this new structure does not require a ground plane, it has very simple structure. It shows better mutual coupling reduction characteristic than conventional soft surface structures. This structure can be applied for surface...
The design of a Ka-band coplanar waveguide slot-coupled patch antenna ESA with integrated MEMS phase shifters has been described above. The incorporation of MEMS phase shifters into the ESA design results in a compact, efficient uplink mechanism for a future Army satellite communication system. A control board for biasing the phase shifters and initiating beam steering will be incorporated into the...
This paper presents an investigation of both electromagnetic wave model and equivalent circuit model for microstrip patch antenna (MPA) with rectangular defected ground plane structure (RDGS). The objective of the proposed design is to reduce antenna size from Wi-Fi wireless band to the Bluetooth band. The first part of the paper describes the electromagnetic wave modeling using the High Frequency...
In this paper an analytical approach based on generalized cavity model and segmentation method has been proposed to investigate the wideband behavior of the probe-fed, U-Slot microstrip patch antenna. Contour integration methods to improve the overall convergence of the analysis has been demonstrated. Numerical results on convergence will be presented at the time of the conference.
In this paper we present the design of a new metamaterial cell which is double negative in permeability and in permittivity. This paper presents a design of a 3D metamaterial based on a symmetrical half ring (SHR-W) unit cell. The effective parameters of the SRH cell are presently negative and exhibit low loss. A 3D metamaterial equivalent model based on SHR-W was used like a lens on top of a patch...
A novel phaseless near-field far-field transformation algorithm for spherical antenna measurements has been presented. The algorithm expands the radiated AUT field distribution in spherical harmonics and the missing phase information is retrieved in an iterative manner from an additional amplitude measurement on a second sphere. The spherical phase retrieval algorithm has been verified using simulated...
Microstrip patch antennas with inset feed have been studied extensively over the past two decades because of its practical advantage when used in mobile wireless systems. The length of MPA, however, is comparable to a half wavelength with single resonant frequency and bandwidth around 2%. In this paper, we describe a novel approach to reduce the antenna size and provide multiband operation. Electromagnetic...
A triple-band unidirectional coplanar antenna is developed for WLAN/WiMax wireless applications. The triple-band planar antenna consists of a top-loaded dipole for the 2.4-GHz band, two longer dipoles for 3.5-GHz band, and 2 shorter dipoles for the 5-GHz band. The triple-band antenna is printed on a coplanar substrate. The antenna achieves a similar directional radiation pattern at all of the three...
The miniaturization of electronics systems requires smaller antennas. Therefore a very good characterization of the antennas is needed. One of the available techniques to minimize the antenna size is the use of ceramic materials with very high permittivity. One of the advantages of ceramic materials over other dielectric materials is the possibility of fabricating compact and easy to build several...
In this paper, the one-sided directional slot dipole antenna with for 5 GHz-band application have been designed and experimentally verified. The antenna size is 22 mm times 29 mm, which is smaller than a patch antenna at the same frequency. The measured radiation patterns are in the good agreement with the simulation which shows the effectiveness of the presented technique to realize on-sided directional...
Solutions detailing the radiated fields of patch antennas often determine the electric field components. These components are then combined with appropriate coordinate transforms to realize the spherical coordinate representation suitable for plotting radiation patterns. This paper presents a slight variation on this process that eliminates such a tedious calculation and realizes the electric fields...
Circularly polarized (CP) antennas are attractive to wireless communications applications simply because less strict orientations are required for mobile stations (the end user) with respect to base stations. To achieve CP operation, many designs of patch antennas have been reported in the literature. However, for the designs utilizing dielectric substrates, single-feed, single-element patch antennas...
A novel slot fed dual-polarized patch antenna using a square ring slot and a single layer laminate for the feeding network has been presented. Numerical results have shown that the symmetry properties of the slot-patch pair allow us to obtain good performance in terms of isolation and amplitude of the cross-polar components. Measurements on prototypes will be shown at the conference.
Single fed, high gain and lightweight patch arrays of size 12"times9" are designed and proposed for integration with a harmonic portable RFID radar so as to track the behavioral patterns of invasive Emerald Ash Borer insect. Serial interconnections of the array elements are tapered in order to suppress sidelobe level. With these additions, the proposed harmonic insect tracking radar system...
Reconfigurable radiation patterns in an antenna offer multi-functionality. Similarly, a planar microstrip patch antenna has features such as the low profile, light weight, and ease of installation, etc. Thus a multimode microstrip patch antenna has the capability to offer reconfigurable radiation patterns. Circular microstrip patch antennas have been studied for generating different modes on a substrate...
This paper describes an improved technological process with improved reliability, compatible with the microfabrication of larger patch antenna arrays and very clean with respect to biocompatibility issues. This paper is organized as follows: A study of insertion losses of PDMS transmission lines (TL) is first presented. Then a 4times2 elements patch antenna array printed on a 20-mum thick PDMS membrane...
This work demonstrates a useful application of the ferroelectric thin film varactor technology in the design of reconfigurable microstrip patch antennas. Results show that the resonant frequency of the microstrip patch antenna can be tuned by varying the applied DC voltages on the ferroelectric varactor. A resonance frequency shift from 12.4 GHz to 13.8 GHz was observed for a small dc bias voltage...
The radiation properties of a circular patch antenna with u-slot designed on glass epoxy FR-4 substrate are obtained and compared with that of a normal circular patch antenna designed under identical conditions. The modified antenna not only resonates at two different frequencies allotted by IEEE 802.16 working group for lower band (2.495-2.695 GHz) operation for WiMax systems but also presents marked...
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