James Becker

Dejan Filipovic

Hans Schantz

Seong-Youp Suh

Ultra-Wideband Antennas

This paper deals with the calibration procedures of an Archimedean spiral antenna used for a stepped frequency continuous wave radar (SFCW), which works from 400&#x02009;MHz to 4845&#x02009;MHz. Two procedures are investigated, one based on an error-term flow graph for the frequency signal and the second based on a reference metallic plate located at a certain distance from the ground in order to identify the phase dispersion given by the antenna. In the second case, the received signal is passed in time domain by applying an ifft, the multiple reflections are removed and the phase variation due to the time propagation is subtracted. After phase correction, the time domain response as well as the side lobes level is decreased. The antenna system made up of two Archimedean spirals is employed by SFCW radar that operates with a frequency step of 35&#x02009;MHz.

Ioan Nicolaescu

Piet van Genderen

Archimedean Spiral Antenna Calibration Procedures to Increase the Downrange Resolution of a SFCW Radar

This paper presents the design equations for lower band-edge frequency for all the regular shapes of printed monopole antennas with various feed positions. The length of the feed transmission line is a critical design parameter of these monopole antennas. Design curves for the length of the feed transmission line for various lower band-edge frequencies for all these regular shaped monopoles have been generated. A systematic study has been presented to explain the ultra-wide bandwidth obtained from these antennas with an example of elliptical monopole antenna.

K. P. Ray

Design Aspects of Printed Monopole Antennas for Ultra-Wide Band Applications

An analysis of interactions between radiators in a UWB biconical array, drawing attention to single and multiple scatterings, is carried out. The complementarity between electrical coupling and radiation scattering is argued. The point source approximation is discussed and shown to be insufficient. An approximation of radiation scattering based on angular averaging of the scattering coefficient is proposed. This approach yields a reduction of the problem complexity, which is especially interesting in UWB multiple antenna systems, because of the large bandwidth. Multiple scattering between radiators is shown to be a second-order effect. Finally, a time domain approach is used in order to investigate pulse distortion and quantify the exactness of  the proposed scattering model.

Raffaele D'Errico

Alain Sibille

Single and Multiple Scattering in UWB Bicone Arrays

A novel printed monopole antenna employing a slotted-plate, which is electromagnetically coupled to the microstrip-fed planar element, is proposed to provide notch-frequency function. This technique enables stopband characteristics with improved control, compared to placing the slot in the microstrip-fed element. A detailed investigation of the rejectband properties has been made for the UWB antenna. Measured data for the optimized case show the 10 dB return loss bandwidth to be 9.8 GHz (from 2.80 GHz to 12.60 GHz) with a notchband frequency from 5.15 GHz to 5.825 GHz. Propagation measurements indicate that the electromagnetically coupled slot provides a greater reduction in stopband gain for the three principal planes, compared to placing the slot in the fed element. This is desirable to mitigate interference from WLAN systems. A full parametric study of the antenna is presented.

X. L. Bao

M. J. Ammann

Printed UWB Antenna with Coupled Slotted Element for Notch-Frequency Function

Parametric study of the impedance and radiation characteristics of a dual elliptically tapered antipodal slot antenna (DETASA) is undertaken in this paper. Usually, the performance of the DETASA is sensitive to the parameters, the effects of major geometry parameters of the radiators and feeding transition of the DETASA on antenna performance are investigated across the frequency range of 1&#x2013;18&#x2009;GHz. The information derived from this study provides guidelines for the design and optimization of the DETASAs which are widely used for UWB applications.

Xianming Qing

Zhi Ning Chen

Michael Yan Wah Chia

Parametric Study of Ultra-Wideband Dual Elliptically Tapered Antipodal Slot Antenna

Compact directive UWB antennas are presented in this paper. We propose an optimization of the F-probe fed triangular patch antenna. The new design achieves an impedance bandwidth of <svg style="vertical-align:-0.27588pt;width:27.424999px;" id="M1" height="11.5" version="1.1" viewBox="0 0 27.424999 11.5" width="27.424999" xmlns="http://www.w3.org/2000/svg">
	<g transform="matrix(1.25,0,0,-1.25,0,11.5)">
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</svg> (3&#x2013;6.15&#x2009;GHz) and presents good radiation characteristics over the whole impedance bandwidth. The average gain is 6.1&#x2009;dB. A time-domain study has been performed to characterize the antenna behavior in case a UWB pulse is used. Finally, we propose an alternative solution to facilitate the manufacturing process using metallized foam technology. It also improves the robustness of the antenna as well as reducing its cost.

A. C. Lepage

X. Begaud

G. Le Ray

A. Sharaiha

UWB Directive Triangular Patch Antenna

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International Journal of Antennas and Propagation publishes research on the design, analysis, and applications of antennas, along with studies related to the propagation of electromagnetic waves through space, air, and other media.

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International Journal of Antennas and Propagation publishes research on the design, analysis, and applications of antennas, along with studies related to the propagation of electromagnetic waves through space, air, and other media.

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International Journal of Antennas and Propagation

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International Journal of Antennas and Propagation

Ultra-Wideband Antennas

Ultra-Wideband Antennas

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