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# 2000 IEEE-APS Conference on Antennas and Propagation for Wireless Communications (Cat. No.00EX380)

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Displaying Results 1 - 25 of 48
• ### 2000 IEEE-APS Conference on Antennas and Propagation for Wireless Communications (Cat. No.00EX380)

Publication Year: 2000
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• ### Author index

Publication Year: 2000, Page(s):195 - 196
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• ### A shooting and bouncing beams method for fast 3D indoor propagation channel characterization

Publication Year: 2000, Page(s):73 - 76
| | PDF (204 KB)

A shooting and bouncing beams (SBB) method is presented, for indoor propagation channel modeling. The advantage of the method comes from the fact that the number of beams to be launched is smaller than the number of rays in ray-tracing or ray-launching methods. The SBB method is particularly well suited for the millimeter wave range. Its application is illustrated by radio coverage simulations in ... View full abstract»

• ### Low-cost flat antennas for mobile and wireless communications

Publication Year: 2000, Page(s):133 - 136
Cited by:  Papers (1)
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A class of flat antenna arrays that uses multi-layer printed circuit technology offers several advantages that make them attractive for mobile and wireless communications. Lower profile and lighter weight are among the desirable features. This paper surveys the applications that may use this type of antenna and reviews some of the developments for consumer terminals in a number of mobile and wirel... View full abstract»

• ### Analysis of integrated inverted-F antennas for Bluetooth applications

Publication Year: 2000, Page(s):21 - 24
Cited by:  Papers (55)  |  Patents (1)
| | PDF (212 KB)

An integrated planar inverted-F antenna (PIFA) is proposed and analyzed. The antenna is printed on the RF printed circuit board of a wireless communication device. Numerical analysis data shows that such an antenna can be utilized with as small as 22 mm by 5 mm by 1 mm of volume. The volume occupancy can be further reduced by adjusting various different antenna parameters. Such guidelines have als... View full abstract»

• ### Effects of design parameters on the radiation pattern of Rotman type multiple beam forming lens

Publication Year: 2000, Page(s):187 - 190
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The design of a compact Rotman (1963) type lens for wide angle scanning has been proposed. The lens designed using the proposed approach has been analyzed using the contour integral approach. The effects of the design parameters on the radiation patterns have also been investigated View full abstract»

• ### A new method to measure radiation efficiency of terminal antennas

Publication Year: 2000, Page(s):5 - 8
Cited by:  Papers (9)
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This paper considers characterization of small antennas, which operate in a multipath environment, such as antennas for mobile phones and Bluetooth modules. The characterization method is based on measurements in a reverberation chamber, which is possible due to the fact that the terminals are located in a complex multipath environment, so that normal characteristics such as radiation pattern shap... View full abstract»

• ### An hidden Markov model for indoor channel based on experimental data

Publication Year: 2000, Page(s):69 - 72
Cited by:  Papers (1)
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Accurate models of digital transmission channels is fundamental in the assessment of the performance of communications systems. In particular generative models for their usability in simulations have been studied through the years. In this paper we describe a model using deterministic hidden Markov systems customized to match experimental data and provide some rule of thumb to drive the architectu... View full abstract»

• ### Fractal loop elements in phased arrays for wireless communication: design, analysis, and measurement

Publication Year: 2000, Page(s):129 - 132
Cited by:  Papers (1)
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Fractal geometries can be utilized to design miniaturized resonant loop antennas that can increase the flexibility of the design of planar phased arrays. Smaller fractal loop elements lead to a more optimal synthesis of phased arrays that can be incorporated into portable wireless devices. Their planar structures also allows for easy fabrication View full abstract»

• ### Geometrically based directional channel model for urban mobile communication systems

Publication Year: 2000, Page(s):87 - 90
Cited by:  Papers (7)
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This paper proposes a geometrically based propagation model for an urban mobile environment that establishes a relationship between the angle-of-arrival and time-of-arrival of multipath components. The model is characterized by the geometric locations of a base station and mobile station among urban city structures. This model comprises three sets of propagation characteristics: the street-microce... View full abstract»

• ### Wide band meander line antenna for wireless communication systems

Publication Year: 2000, Page(s):17 - 20
Cited by:  Papers (9)  |  Patents (1)
| | PDF (276 KB)

Printed antennas are becoming one of the most popular designs in personal wireless communications systems. In this paper, the design of a novel tapered meander line antenna is presented. The design analysis and characterization of the antenna is performed using the finite difference time domain technique and experimental verifications are performed to ensure the effectiveness of the numerical mode... View full abstract»

• ### Antenna separation and capacity of BLAST in correlated channels

Publication Year: 2000, Page(s):183 - 185
Cited by:  Papers (3)
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BLAST (Bell-labs LAyered Space-Time) is a communication technique for achieving very high spectral efficiencies in highly scattering environments using multiple transmit and receive antennas. The large capacities promised by the use of BLAST may be realized when transfer functions between all pairs of elements are largely uncorrelated. However, as the base station is usually placed above local clu... View full abstract»

• ### Compact dielectric resonator antenna for PCS mobile handsets

Publication Year: 2000, Page(s):1 - 4
Cited by:  Papers (2)
| | PDF (284 KB)

In response to increasing demand for compact efficient antennas, various cylindrical geometries of dielectric resonator antennas (DRA) are investigated in this paper. These DRA geometries offer significant reduction in volume, making them potential candidates for use in compact applications such as mobile communication handset. Approximate theory of PMC walls developed for predicting resonant radi... View full abstract»

• ### Technology challenges in adapting commercial wireless technology to military applications

Publication Year: 2000, Page(s):161 - 164
Cited by:  Papers (2)
| | PDF (312 KB)

A wide range of technologies contribute to the implementation of military wireless networks ranging from antennas and propagation, digital signal processing, electrochemical, cryptographic and network system control. Although these technologies are well developed in their own right in wireline based networks, there are particular constraints in the categories of mobility, connectivity and energy t... View full abstract»

• ### Indoor angle of arrival using wide-band frequency diversity with experimental results and EM propagation modeling

Publication Year: 2000, Page(s):65 - 68
Cited by:  Papers (2)
| | PDF (260 KB)

In this work we have investigated the problem of angle of arrival (AOA) estimation in the indoor environment. Coherent, multi-path signals must be resolved. The approach is based upon measurement of the AOA using a band of frequencies, approximately 10%-20% of center, and utilizes order statistic filtering to estimate the true angle of arrival from the set of individual AOAs. A plane wave model is... View full abstract»

• ### Design of a passive element array

Publication Year: 2000, Page(s):125 - 128
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We introduce a procedure for designing an antenna system based on a single dipole element surrounded by an array of scattering elements. The goal is to achieve a desired pattern by astute placement of the elements in a fixed grid. This represents a departure from the traditional approach to directive arrays in which the current in each element is controlled. The problem is similar to the design of... View full abstract»

• ### Ray optical simulation of indoor corridor propagation at 850 and 1900 MHz

Publication Year: 2000, Page(s):81 - 86
Cited by:  Papers (5)
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In indoor propagation, the decline in field strength with distance has been modeled as inversely proportional to rn, where n is found empirically. In this paper, the field strength in a 50 m hospital corridor is computed by geometrical optics. The computed field strength is well represented as declining as 1/r at close distances and as 1/r n farther away, with n chosen to min... View full abstract»

• ### A U-shaped inverted F microstrip patch antenna for portable terminals

Publication Year: 2000, Page(s):31 - 34
| | PDF (248 KB)

The intrinsic disadvantages of patch antennas such as narrow bandwidth and nonuniform coverage are the reasons why this class of antenna has not been seriously considered for hand-held application. In this paper we present a new design for a U-shaped patch antenna that has a reasonable bandwidth, adequate coverage, and less interaction with the head and the hand of the user. Based on our earlier i... View full abstract»

• ### A novel approach for the modelling of bow-tie microstrip antennas using FDTD method

Publication Year: 2000, Page(s):13 - 16
| | PDF (188 KB)

A novel approach for the fast modelling of centre fed bow-tie microstrip antennas, using the modified locally conformal finite difference method (MCFDTD) coupled with the concept of symmetry plane, is presented. The use of MCFDTD enables us to choose number of cells along the antenna length and width independent of the antenna central width and the concept of symmetry plane reduces the problem spa... View full abstract»

• ### A novel beamformer with multiple signal reception for GPS receivers

Publication Year: 2000, Page(s):171 - 174
Cited by:  Papers (2)  |  Patents (1)
| | PDF (180 KB)

A novel beamformer is proposed for simultaneous reception of multiple satellite signals, while rejecting interference. The scheme consists of three stages. Firstly a singular value decomposition technique is utilized to construct a transformation for removing interferers. Secondly, an eigen-based beam forming is performed based on the transformed data consisting of only satellite signals and addit... View full abstract»

• ### Convex optimization of antenna power control for wireless cellular systems

Publication Year: 2000, Page(s):179 - 182
| | PDF (220 KB)

Interference is the major limiting factor in the performance of wireless cellular systems, introducing an error floor and restricting the number of users. Antenna power control is an important method to mitigate interference, but current ad hoc power control schemes cannot at the same time be optimal, fast and able to accommodate many practical constraints. We formulate the general power control p... View full abstract»

• ### Wide-band folding horn type microwave antennas

Publication Year: 2000, Page(s):143 - 146
| | PDF (216 KB)

The authors illustrate the idea of a folding horn type antenna. The main difference from a traditional horn is its multipoint excitation. In ordinary horns the increase of aperture dimensions for a given length of the horn leads to undesirable quadratic phase variations of radiating field in its aperture. To avoid them a large length of the horn is essential. In a folding horn the necessary in-pha... View full abstract»

• ### Improved method for estimating angle of arrival in multipath conditions using the MUSIC' algorithm

Publication Year: 2000, Page(s):99 - 102
Cited by:  Papers (3)
| | PDF (272 KB)

The paper presents an improved method of estimating the angle of arrival (AOA) of a signal from a cellular radio mobile handset using a uniform linear antenna array at the base station receiver. The method is based on the MUSIC' algorithm. In multipath fading conditions this method can provide a biased estimate of angle of arrival due to the effect of the scattered signals. The new method incorpo... View full abstract»

• ### An empirical study of radio propagation aboard naval vessels

Publication Year: 2000, Page(s):157 - 160
Cited by:  Papers (8)
| | PDF (280 KB)

Most existing studies of indoor radio wave propagation have addressed operations in common commercial environments such as warehouses, office buildings and factories. These studies show typical path loss gradients ranging from 3-5, and rms delay spreads ranging from 10-40 nanoseconds. This paper reports the results of research conducted to characterize microwave radio propagation aboard Navy ships... View full abstract»

• ### A statistical model of space-time radio propagation in indoor environments

Publication Year: 2000, Page(s):61 - 64
Cited by:  Papers (1)
| | PDF (280 KB)

Previously, simulation algorithms based upon the ray tracing technique have provided the only means for developing a detailed description of the joint space-time properties of microwave radio propagation. Although widely accepted, ray tracing suffers several drawbacks, such as the need for an accurate physical database, and precise knowledge of the site-specific construction parameters. This paper... View full abstract»