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Proceedings ArticleDOI

Time domain studies of ultra wideband monopole: Theoretical study to alleviate ambiguities

TL;DR: In this article, the authors proposed a new technique and examined the same for a UWB monopole antenna, which should alleviate present lacunae in time domain analysis and help one to obtain accurate characteristics theoretically.
Abstract: Monocycle pulses are commonly used to analyze ultra wideband (UWB) antennas in time domain. But no standard guideline is available to estimate its accurate pulsewidth. In this paper, we propose a new technique and examine the same for a UWB monopole antenna. This approach should alleviate present lacunae in time domain analysis and help one to obtain accurate characteristics theoretically.
References
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01 Jan 2009
TL;DR: In this paper, basic principles for ultra-wideband (UWB) radiation are presented and discussed in a discussion starting with a description of the influence of antennas on UWB transmission, and parameters characterizing antennas in time and in frequency domain are specified.
Abstract: Basic principles for ultra-wide-band (UWB) radiation are presented and discussed in this paper. The discussion starts with a description of the influence of antennas on UWB transmission. The parameters characterizing antennas in time and in frequency domain are specified. Since the number of possible antenna structures is nearly unlimited, the focus will be on a classification according to different radiation principles. For each of these mechanisms, the typical advan- tages and disadvantages are discussed, and an example antenna and its characteristics are presented. For a wireless engineer, the problem to solve is the proper design of an antenna with the desired radiation characteristics. The final outcome of this paper is that there exist numbers of UWB antennas, but not each of them is suited for any application, especially in view of radar and communication systems requirements.

268 citations

Journal ArticleDOI
16 Mar 2009
TL;DR: The final outcome of this paper is that there exist numbers of UWB antennas, but not each of them is suited for any application, especially in view of radar and communication systems requirements.
Abstract: Basic principles for ultra-wide-band (UWB) radiation are presented and discussed in this paper. The discussion starts with a description of the influence of antennas on UWB transmission. The parameters characterizing antennas in time and in frequency domain are specified. Since the number of possible antenna structures is nearly unlimited, the focus will be on a classification according to different radiation principles. For each of these mechanisms, the typical advantages and disadvantages are discussed, and an example antenna and its characteristics are presented. For a wireless engineer, the problem to solve is the proper design of an antenna with the desired radiation characteristics. The final outcome of this paper is that there exist numbers of UWB antennas, but not each of them is suited for any application, especially in view of radar and communication systems requirements.

254 citations

Journal ArticleDOI
TL;DR: An antenna's transient response can be used to determine the suitability of the antenna in wideband applications, and the radiation and reception properties of various conventional ultra-wideband antennas in the time domain are illustrated.
Abstract: Broadband antennas are very useful in many applications because they operate over a wide range of frequencies. The objective of this paper is to study the transient responses of various well-known antennas over broad frequency ranges. As such, the phase responses of these antennas as a function of frequency are of great interest. In the ensuing analysis, each antenna is excited by a monocycle pulse. Many antennas show resonant properties, and numerous reflections exist in the antennas' outputs. The first part of this paper deals with ways of converting various resonating antennas to traveling-wave antennas by using resistive loading. Appropriate loading increases the bandwidth of operation of the antennas. However, the drawback is the additional loss in the load applied to the antenna structure, leading to a loss of efficiency to around fifty percent. However, some of the antennas are inherently broadband, up to a 100:1 bandwidth. Hence, the transient responses of these antennas can be used to determine their suitability for wideband applications with a low cutoff frequency. The second part of the paper illustrates the radiation and reception properties of various conventional ultra-wideband (UWB) antennas in the time domain. An antenna's transient response can be used to determine the suitability of the antenna in wideband applications

115 citations

Journal ArticleDOI
TL;DR: In this article, two geometries of dielectric ring resonator (DRR) have been investigated as new variants for designing ultrawideband hybrid monopole-DRAs with improved features.
Abstract: Two geometries of dielectric ring resonator (DRR) have been investigated as new variants for designing ultrawideband hybrid monopole-DRAs (dielectric resonator antennas) with improved features. They are simply hemispherical and conical in shape and have been implemented individually. Hybrid monopole-DRA is actually a combined configuration using a grounded monopole surrounded by a small DRR touching the same ground plane. Compared to an earlier version using cylindrical DRR of same dielectric material, the proposed ones promise for about 25% larger impedance bandwidth maintaining identical gain and radiation properties. As much as 126% impedance bandwidth with consistent monopole type radiation and 2-4 dBi peak gain has been demonstrated using a set of prototypes shaped from dielectric rod with er = 10. Physical insight in to the ultrawideband operation along with a comprehensive design guideline is presented.

77 citations


"Time domain studies of ultra wideba..." refers background in this paper

  • ...This is a hybrid-type dielectric monopole antenna reported in [2]....

    [...]

Journal ArticleDOI
TL;DR: In this paper, the transient response of thin-wire dipoles is investigated using a time-domain integral-equation method, and the directional characteristics are demonstrated by the gain for dipoles and V-dipoles.
Abstract: In this paper, the transient response of thin-wire dipoles is investigated using a time-domain integral-equation method. First, an antenna system comprising two straight wire dipoles is numerically ana- lyzed using the direct method and the separation method, and is verified by the measurement. The separation method enables us to consider the transmitting antenna and the receiving antenna separately during the antenna-system design process. Secondly, the transient response of an antenna excited by pulses with different time duration is investigated. The response strongly depends on the time duration of the pulse. Lastly, the directional characteristics are demonstrated by the gain for dipoles and V-dipoles. The received pulses by antenna systems composed of V-dipoles are discussed. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 43: 253-258, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20435

4 citations