Radial EBG cell layout for GPS patch antennas (2009)
Ruvio, Giuseppe, Ammann, Max, Bao, Xiulong
A novel radial layout for mushroom-like electromagnetic-bandgap (EBG) cells surrounding a printed circularly-polarised patch antenna is proposed. Two radial EBG configurations surrounding a circular...
Antenna optimization with a computationally efficient multiobjective evolutionary algorithm. (2009)
An efficient multiobjective evolutionary algorithm is described for optimizing a novel spline based printed monopole antenna. The antenna geometry is based on spline outlines. Both radiating element...
Emitter-wrap-through photovoltaic dipole antenna with solar concentrator (2009)
Roo Ons, M. J., Shynu, S. V., Ammann, Max, McCormack, S. J., Norton, B.
A novel photovoltaic dipole antenna employing a solar concentrator as a reflector is proposed. Four identical emitter-wrap-through rear contact solar cells connected in series as a folded dipole are...
Microstrip-fed dual-frequency annular-slot antenna loaded by split-ring-slot (2009)
A compact dual-band annular-slot antenna loaded by a concentric split-ring-slot is presented. A stepped microstrip feedline enables the control of the coupling and provides good matching. The...
A printed CPW-fed slot-loop antenna with narrowband omnidirectional features (2009)
The design of a novel CPW-fed printed slot-loop antenna with narrowband omnidirectional attributes is proposed. The antenna geometry is selected to reduce slot coupling, thus achieving both a narrow...
Dual-frequency dual-sense circularly-polarized slot antenna fed by microstrip line (2008)
A new design of a dual-frequency dual circularly-polarized slot antenna is presented. The dual-frequency is achieved using a single-layer microstrip-fed configuration coupled to a modified...
Ammann, Max, Curto, S., Bao, X. L., McEvoy, P.
The design of a miniaturised low-profile efficient hyperthermia applicator is presented. The efficiency is attributed to small size, resilience to detuning and wide bandwidth. The antenna provides a...
The effects of a Klopfenstein tapered transmission line used to feed a typical planar monopole UWB antenna have been investigated in terms of impedance bandwidth, phase linearity and radiation...
Dual frequency dual circularly-polarised patch antenna with wide beamwidth. (2008)
A dual-frequency dual-circularly polarised patch antenna with wide beamwidth is proposed. The two-layer structure comprises circular patches with offset circular slots connected to rectangular slots....
Fast and simple high resolution optical spectrum analyser (2008)
Lauterback, Kai-Uwe, Schneider, Thomas, Henker, Ronny, Ammann, Max, Schwarzbacher, Andreas Thomas
A simple method for fast optical spectroscopy with high resolution is shown. The method is based on the narrowband Brillouin gain process in optical fibers.
1 Gbit/s radio over fiber downlink at a 32 GHz carrier (2008)
Junker, Marcus, Schneider, Thomas, Lauterbach, Kai-Uwe, Henker, Ronny, Ammann, Max, Schwarzbacker, Andreas
The carrier frequency of the presented radio over fiber downlink at 32 GHz is generated by stimulated Brillouin scattering and an error free 1 Gbit/s data transmission is realized.
Interaction of RF-Hyperthermia applicator with high fidelity human body model (2008)
Curto, S., See, T.S. P., Chen, Z. N., McEvoy, P., Ammann, Max
A compact patch antenna working at the 434 MHz ISM frequency band is proposed as an RF-Hyperthermia applicator. The electromagnetic interaction in terms of S11, SAR and E-Field distribution of the...
A metal plate solar antenna for umts pico-cell base station (2008)
Shynu, S. V., Roo Ons, Maria J., Ammann, Max, McCormack, Sarah, Norton, Brian
A simple low-cost solar antenna design for UMTS base station is proposed. The optimum orientation of the silver DC bus bars of the solar cell is found to be Ag-parallel, in order to achieve best...
A microstrip printed dipole solar antenna using polycrystalline silicon solar cells (2008)
Shynu, S. V., Roos Ons, Maria J., Ruvio, Giuseppe, Ammann, Max, McCormack, Sarah, Norton, Brian
A novel printed dipole solar antenna design with an integrated balun is proposed for the first time with high efficiency polycrystalline silicon solar cells is presented in this paper. The optimum...
Reduction of ground-plane-dependent effects on microstrip-fed printed rectangular monopoles (2008)
John, M., Evans, J. A., Ammann, Max, Modro, J. C., Chen, Z. N.
Methods to mitigate the strong dependence of impedance bandwidth on the ground- plane size for a rectangular printed planar monopole is described. It is shown that the bandwidth limitation may be...
Spatial group delay patterns for three ultra wideband spline antennas (2008)
McEvoy, Patrick, John, Matthias, Curto, Sergio, Ammann, Max
The IEEE ultra wideband (UWB) standard includes both a multiple frequency carrier (MB-OFDM) and an impulse spectrum (DS-UWB) method, for which application antennas should be appropriately optimized....
Optimization of the Brillouin spectrum for fiber based slow light systems (2008)
Henker, Ronny, Wiatrek, Andrzej, Lauterbach, Kai-Uwe, Schneider, Thomas, Ammann, Max, Schwarzbacker, Andreas
This article shows simulation results and first practical investigations of the optimization of a Brillouin spectrum with the natural bandwidth superimposed with two losses for fiber based slow light...
UWB Vivaldi antenna based on a spline geometry with frequency band-notch (2008)
John, Matthias, Ammann, Max, McEvoy, Patrick
A printed UWB Vivaldi antenna is presented in this paper. Its geometry is based on a novel spline shape and optimised by an efficient global optimisation algorithm. A U-shaped slot is introduced into...
Roo Ons, Maria J., Shynu, S. V., Ammann, Max, McCormack, Sarah, Norton, Brian
The integration of communication devices with photovoltaic (PV) technology leads to the development of autonomous communication systems distinguished by immunity to grid breakdowns and...
Group delay performance of ultra wideband monopole antennas for communication applications (2008)
McEvoy, P., John, Matthias, Curto, S., Ammann, Max
While limited in dimensions, the shape of small ultra wideband (UWB) antennas can significantly impact on the required gain pattern stablity and the inherent impulse spreading throughout the...
Henker, Ronny, Wiatrek, A., Lauterbach, K. U., Ammann, Max, Schwarzbacher, Andreas Thomas, Schneider, Thomas
Presented are theoretical investigations and simulations of a reduction of the group velocity dispersion (GVD) in slow-light systems by an optimisation of the gain spectrum of the stimulated...
Design of compact multi-band EBG structures (2007)
Several novel compact multiple-band high-impedance surface EBG structures are presented. By utilizing four S-shape corrugated arms or spiral arms connected to the edge of a small square patch to...
Dual frequency dual circularly-polarised patch antenna with wide beamwidth. (2007)
A novel probe-fed single-layer annular-ring patch antenna for dual-frequency circular polarization is evaluated numerically and experimentally verified. The proposed antenna consists of a small...
In order to minimize exposure to human tissue, electromagnetic interaction with antennas has benefited from a lot of research since hand-held communication transceivers became widely used consumer...
Henker, Ronny, Schneider, Thomas, Junker, Markus, Lauterbach, Kai-Uwe, Ammann, Max, Schwarzbacker, Andreas Thomas
An effective method to enhance the time delay in SBS-based slow-light systems by decoupling the delay from the Brillouin gain is shown. A drastic improvement of the time delay in one fiber segment...
High quality millimeter wave generation via stimulated Brillouin scattering (2007)
Junker, Marcus, Schneider, Thomas, Lauterbach, Kai-Uwe, Henker, Ronny, Ammann, Max, Schwarzbacker, Andreas
A new and simple method for the generation and modulation of Millimeter waves is presented. Based on frequency upconversion via Stimulated Brillouin Scattering, it is very flexible in its output...
Inset-fed mircrostrip patch antenna with integrated polycrystalline photovoltaic solar cell. (2007)
Shynu, S. V., Roos Ons, Maria J., Ammann, Max, Gallagher, Sarah, Norton, Brian
A novel method of integrating microstrip patch antennas and polycrystalline silicon solar cells for application in autonomous communication systems is presented. The DC and RF functions are...
Investigation on proximity-coupled microstrip integrated PV antenna (2007)
Roo Ons, M. J., Shynu, S. V., Ammann, Max, McCormack, S., Norton, B.
The use of polycrystalline silicon solar cells (156 times156 mm) as a groundplane for a proximity-coupled microstrip square patch antenna (30 times 30 mm) is investigated. Four different models that...
Investigation of fast light in long optical fibers based on stimulated Brillouin scattering (2007)
Lauterback, Kai-Uwe, Schneider, Thomas, Henker, Ronny, Junker, Marcus, Ammann, Max, Schwarzbacker, Andreas
A simple method to generate a negative time delay in SBS-based fast-light systems using Brillouin gain and loss is shown. We achieved a maximum negative time delay of 32.4 ns in one long fiber...
A low-profile miniature antenna with very wide bandwidth is proposed for emerging multimode devices. It comprises a small circular patch antenna loaded by a metallic annular-ring and located on a...
Low-profile rolled planar antenna with wide bandwidth (2007)
A novel size-reduction technique for a planar monopole type antenna is presented. By rolling the planar element of this antenna, a low-profile radiator with broad impedance bandwidth is obtained...
Miniaturized annular ring loaded patch antennas (2007)
The proliferation of wireless communication systems has promoted the development of miniaturized antenna designs. Annular ring patch antennas are reported to reduce antenna size. In this paper,...
The effect of one, two and three lines of EBG mushroom-like cells on the coupling of two different 2-element arrays was analyzed and described. It was demonstrated that a certain surface waves...
Printed band-rejection UWB antenna with H-shaped slot (2007)
The development of the high data rate wireless communication systems, has placed significant demands on antenna designers, in particular, the requirement for smaller elements with broader bandwidths....
Slow and fast-light in optical fibers:an overview (2007)
Henker, Ronny, Schneider, Thomas, Lauterbach, Kai-Uwe, Junker, Markus, Ammann, Max, Schwarzbacker, Andreas
Slow- and fast-light is the control of the velocity of light in a medium by light. As a fascinating new field in physics there is a fundamental interest on this effect on the one side, but on the...
Some techniques to improve small groundplane printed monopole performance (2007)
Printed planar monopole antennas are enjoying considerable popularity and publicity to their low-profile, wide bandwidth, quasi-omnidirectional radiation characteristics and their ease of...
A novel wideband semi-planar miniaturized antenna (2007)
A semi-planar miniaturized antenna which operates over the FCC allocated UWB spectrum is presented. The small antenna comprises a folded conducting element connected to a printed section. Several...
Spline based geometry for printed UWB antenna design (2007)
This paper presents a geometry for ultra-wideband (UWB) antennas which is based on quadratic Bezier spline curves. A genetic algorithm (GA) is used to optimise the geometry. The search space for the...
Wideband reconfigurable rolled planar monopole antenna (2007)
A method for the design and optimization of wideband printed planar monopoles using a genetic algorithm (GA) is presented. This novel technique employs overlapping sub patches which ensures...
Spline based geometry for printed monopole antennas (2007)
A novel Bezier spline-based geometry for printed monopole antennas is presented. Quadratic curves are used to describe the outline of the radiating element. The geometry is optimised by a genetic...
Small patch/slot antenna with 53% input impedance bandwidth (2007)
A small microstrip patch/slot antenna, which achieves a very large bandwidth on a relatively thin substrate (about 0.01lambda0), is presented. The performance is achieved by employing a combination...
Groundplane dependent performance of printed antenna for MB-OFDM-UWB. (2007)
Cutro, Sergio, John, Matthias, Ammann, Max
A printed ultra wideband (UWB) antenna suitable for multiband orthogonal frequency division multiplexing (MB-OFDM) UWB is presented in this paper. The proposed antenna covers a wide band from 3.1 GHz...
Junker, Markus, Ammann, Max, Schwarzbacher, Andreas, Klinger, Jens, Lauterback, Kai-Utwe, Schneider, Thomas
Measurements of phase noise of a 40-GHz carrier signal are presented. The carrier is generated by the amplification of harmonics due to stimulated Brillouin scattering. An analogy to a generation of...
A novel GPS patch antenna on a fractal Hi-Impedance surface substrate (2006)
Bao, X. L., Ruvio, G., Ammann, Max, John, Matthias
A compact high-performance circularly-polarized microstrip antenna for the global positioning system application is proposed. It comprises a fractal hi-impedance surface electromagnetic bandgap (EBG)...
Cheng, Zhi Ning, Ammann, Max, Qing, Xianming, Wu, Xuan Hui, See, T. S.P., Cat, A.
This article reviews the state of the art in broadband antennas for emerging UWB applications and addresses the important issues of the broadband antenna design for UWB applications. First, a variety...
Circular loop antenna operating at 434 MHz for medical applications: loop-tissue interaction (2006)
The interaction between the circular loop antenna and human tissue is investigated. Return loss, radiation efficiency and specific absorption rate (SAR) when in proximity to human tissue is evaluated...
A dual-frequency dual-circularly polarised patch antenna with wide beamwidth is proposed. The two-layer structure comprises circular patches with offset circular slots connected to rectangular slots....
Compact concentric annular-ring patch antenna for triple frequency operation (2006)
A novel single-layer, single-feed concentric annular-ring microstrip patch antenna providing triple-frequency operation is proposed and experimentally studied. This is achieved by embedding a small...
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From L-shaped planar monopoles to a novel folded antenna with wide bandwidth. (2006)
A novel folded monopole antenna is investigated numerically and experimentally. The proposed antenna comprises a short folded monopole suitably shaped at the base with two vertical grounding probes....
High performance circularly polarized antenna based on fractal EBG structure (2006)
Bao, X. L., Ammann, Max, Ruvio, G., John, M.
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Investigation on annular-ring patch antenna with EBG structure (2006)
Bao, X. L., Ruvio, G., Ammann, Max
In EuCAP 2006,First European Conference on Antennas and Propagation, 6-10 November, Nice, France, 2006. ISBN: 978-92-9092-937-6 Digital Object Identifier: 10.1109/EUCAP.2006.4584978 Available from...
Quarter-wave metal plate solar antenna (2006)
Shynu, S. V., Ammann, Max, Norton, B.
A novel design of a quarter-wave shorted trapezoidal metal plate solar antenna using high efficiency polycrystalline silicon solar cells is presented. Using the DC conductive parts of the cell as RF...
Lerma, F. Leon, John, M., Ruvio, G., Ammann, Max, Herscovici, N.
A crossed-dipole antenna providing polarization diversity is presented. The antenna which employs a planar reflector yields high directivity and good isolation between ports over a wide impedance...
A new architecture for a multi polarized perpendicularly -fed radiating element (2005)
Herscovici, Naftali, Leon-Lerma, F., Ammann, Max
Planar printed antennas are often required to be fed by parallel feed-networks, which, when printed on the same substrate as the radiating elements, create mutual coupling, spurious radiation and...
Dual-band monopole antenna with stagger-tuned arms for broadbanding (2005)
The paper describes a dual-band miniaturized printed monopole for integration in modern wireless systems. The printed monopole is augmented with two arms, resonant at slightly different frequencies,...
Optimum design of the printed strip monopole (2005)
A monopole antenna, printed on low-cost laminate and fed by a microstrip line, is examined. These types of antennas are becoming popular in view of their broad bandwidth and low-profile structure,...
Printed triband terminal antenna (2005)
John, M., Ammann, Max, Farrell, R.
This paper presents a printed triple-band multibranch monopole for use in modern wireless systems. The antenna is designed to operate in three bands which cover virtually all wireless channels....
A wide-band shorted planar monopole with bevel (2003)
A new wide-band shorted planar monopole with a bevel is presented. The numerical simulations and measurements demonstrate that the impedance bandwidth of a wide-band planar square monopole is shown...
Broadband dual-plate monopole antennas (2003)
Wu, Z., Sevret, P., Ammann, Max
In this paper, dual-plate monopole antennas without and with a shorting pin and/or edge trimming have been studied. The experimental results of return loss have been presented, and compared with...
Circular annular planar monopoles with EM coupling. (2003)
Chen, Z. N., Ammann, Max, Chia, M..Y. W., See, T.S. P.
A circular annular planar monopole with electromagnetic coupling shows broadband properties. The planar radiator is electromagnetically coupled with a probe-fed strip, and separated from it by a thin...
Improved pattern stability for monopole antennas with ultrawideband impedance characteristics (2003)
The requirement of future software defined and reconfigurable radio networks to operate in multiple, wide-ranging, frequency bands places heavy demands on antenna designs. Rather than using antennas...
Modified planar inverted-L antenna (2003)
A hybrid inverted-L antenna (HIL) has been shown to reduce the physical height of a square planar monopole antenna, while retaining a relatively wide impedance bandwidth and good radiation pattern...
Optimization and comparison of broadband monopoles (2003)
Chen, Z. N., Chia, M.Y. W., Ammann, Max
The impedance and radiation properties of four broadband monopoles are compared and the parameters of a new roll monopole are optimised experimentally and numerically. The performances of the roll...
A novel hybrid inverted-L antenna with wide bandwidth. (2003)
Ammann, Max, Evans, J. A., Wu, Z
The paper describes a novel inverted-L antenna which comprises a short planar monopole loaded with two linear elements. This small antenna is shown to have impedance bandwidth up to 100 % for 6 dB...
Annular planar monopole antennas (2002)
Chen, Z. N., Ammann, Max, Chia, W.Y. W., See, T.S. P.
A type of annular planar monopole antenna is presented. The impedance and radiation characteristics of the monopole with different holes and feed gaps are experimentally examined. The measured...
A wideband monopole for reconfigurable multiband radio terminals (2001)
A wideband planar monopole employing two broadbanding techniques is investigated, and is shown to yield an impedance bandwidth ratio of 10:1 or greater for a return loss of 8 dB. The radiation...
A wideband monopole for reconfigurable multiband radio terminals (2001)
A wideband planar monopole employing two broadbanding techniques is investigated, and is shown to yield an impedance bandwidth ratio of 10:1 or greater for a return loss of 8 dB. The radiation...
Small planar monopole covers multiband BRANS. (2000)
The use of a single antenna which can cover a wide range of frequencies is a desirable feature for future wireless communications systems. The emerging self-organising and ad-hoc networks require...
Square planar monopole antenna (1999)
A planar monopole may be realised by replacing the wire element of a conventional monopole with a planar element. In this case, the planar element which is square, is located above a groundplane and...
A comparison of some low cost laminates for antennas operating in the 2.45 GHZ ISM band. (1998)
An evaluation of some low-cost laminates suitable for microstrip patch antennas is presented. Criteria for the selection of substrates for antenna fabrication are given careful consideration. A...