Showing papers on "Metamaterial antenna published in 1983"
23 May 1983
174 citations
TL;DR: In this paper, a single-element rectangular microstrip antenna which can operate simultaneously for two different frequency bands is described, and the antenna can operate at different frequencies for different applications.
Abstract: The letter describes a single-element rectangular microstrip antenna which can operate simultaneously for two different frequency bands.
121 citations
TL;DR: In this article, the validity of using planar antenna patches to characterize microstrip antennas is examined, including the simplest planar patch modes having no field variation normal to the patch surface.
Abstract: Resonant frequencies f_{r} of a cylindrical-rectangular microstrip antenna are theoretically calculated. Comparison is made to f_{r} for a planar rectangular patch antenna, including the simplest planar patch modes having no field variation normal to the patch surface. The validity of using planar antenna patches to characterize microstrip antennas is examined.
109 citations
TL;DR: In this paper, a rectangular microstrip patch antenna has been extensively analyzed with regard to its input impedance and resonant frequency, both for infinite and finite ground plane dimensions, and the contribution from the ground plane edge diffraction has been accounted for in an equivalent radiation conductance and an equivalent diffraction susceptance.
Abstract: The rectangular microstrip patch antenna has been extensively analyzed with regard to its input impedance and resonant frequency, both for infinite and finite ground plane dimensions. For infinite ground planes existing formulas have been compared and improved parameters presented. The influence from the side current radiation has been discussed as well. For finite ground plane dimensions the contribution from the ground plane edge diffraction has been accounted for in an equivalent radiation conductance and an equivalent diffraction susceptance. Formulas for these parameters have been developed on the basis of different theories. They are valid under the condition that only one of the ground plane dimensions are finite at the same time. Experimental investigations are carried out to test the accuracy of the developed formulas, showing good accuracy under the given conditions.
100 citations
TL;DR: In this paper, the effect of substrate thickness on the characteristics of a circular disk microstrip antenna is examined and experimental results explicitly showing the effect on resonant frequency, input impedance, and bandwidth are provided.
Abstract: The effect of substrate thickness on the characteristics of a circular-disk microstrip antenna is examined. In the literature this effect has been dealt with theoretically, but experimental results explicitly showing the effect of substrate thickness on resonant frequency, input impedance, and bandwidth do not seem to be readily available.
54 citations
TL;DR: A modular approach is utilized in which a given antenna is used as a building block for higher gain antennas, and the results seem to validate the usefulness of the method.
Abstract: A method for the design of medium gain (15-25 dB) microstrip array antennas is described. A modular approach is utilized in which a given antenna is used as a building block for higher gain antennas. A series of X -band antennas were built in this way, and the results seem to validate the usefulness of the method.
30 citations
23 May 1983
23 citations
23 May 1983
22 citations
Patent•
12 Apr 1983TL;DR: In this article, a microstrip array antenna, including spaced radiator elements supplied with microwave power, is separated from an underlying ground reference plane by a layer of dielectric material, in which the antenna beam is phase scanned by periodically closing switching devices connected between the reference plane and at least one null point of each radiator element.
Abstract: A microstrip array antenna, including spaced radiator elements supplied w microwave power and separated from an underlying ground reference plane by a layer of dielectric material, in which the antenna beam is phase scanned by periodically closing switching devices connected between the reference plane and at least one null point of each radiator element. In one embodiment, the radiator elements are identical rectangular patches disposed along a path, each patch having a length parallel to the path of one-half wavelength and a width transverse to the path not exceeding one wavelength in the underlying dielectric material at the antenna operating frequency. The patches are connected in series to receive microwave power by conductive strip elements whose widths are selected to effect a desired distribution of radiated microwave power from the patches.
20 citations
TL;DR: In this paper, the variation of voltage standing-wave ratio (VSWR) with frequency for microstrip antennas on stepped and wedge-shaped dielectric-substrates is measured for a band of frequencies, and is compared with those of an equivalent rectangular microstrip resonator.
Abstract: The variation of voltage standing-wave ratio (VSWR) with frequency for microstrip antennas on stepped and wedge-shaped dielectric-substrates is measured for a band of frequencies, and is compared with those of an equivalent rectangular microstrip resonator. The results indicate a considerable improvement in bandwidth.
18 citations
23 May 1983
23 May 1983
01 Sep 1983
TL;DR: In this article, a systematic study on the impedance bandwidth characteristics of the first few modes of the annular ring and the circular disc microstrip antennas is presented, both experimentally and theoretically, that the resonant frequencies can be tuned and the bandwidths widened by introducing an adjustable air gap between the substrate and the ground plane.
Abstract: A systematic study is first presented on the impedance bandwidth characteristics of the first few modes of the annular ring and the circular disc microstrip antennas. It is then established, both experimentally & theoretically, that the resonant frequencies can be tuned and the bandwidths widened by introducing an adjustable air gap between the substrate and the ground plane.
TL;DR: In this article, a suspended patch antenna excited by an inverted microstrip line is analyzed by a spectral domain technique followed by an equivalent waveguide-to-cavity model.
Abstract: A suspended patch antenna excited by an inverted microstrip line is analyzed by a spectral domain technique followed by an equivalent waveguide-to-cavity model. Accuracy of the results is confirmed by comparison with experimental data.
23 May 1983
01 Mar 1983
TL;DR: In this article, a five-term Taylor expansion was proposed for the radiation conductance of a circular microstrip antenna. But the presented formula was incorrect in the last term and was later corrected and a five term formula was presented.
Abstract: In a recently published article by E. Lier [1] an approximation to the radiation conductance of a circular microstrip antenna was given. The presented formula was a three term Taylor expansion in inverse power of er. Unfortunately, the presented formula was incorrect in the last term. Because such a formula is useful for rapid calculations, the formula is corrected and a five term formula is presented here.
23 May 1983