Showing papers on "Metamaterial antenna published in 1992"
TL;DR: In this article, the effect of substrate structure modification on the E-plane scanning performance in large microstrip arrays is studied with the aid of a two-dimensional model, and the goal is to alleviate scan blindness effects.
Abstract: The effect of the substrate structure modification on the E-plane scanning performance in large microstrip arrays is studied with the aid of a two-dimensional model. The goal is to alleviate scan blindness effects. The finite-element method of lines is used to solve the electromagnetic equations, thus demonstrating its applicability to open, periodic structures. >
19 citations
18 Jun 1992
TL;DR: In this article, a dual-band microstrip antenna is demonstrated, where the resonant frequencies can be varied over a wide frequency range and the input impedances are easily matched for both resonance frequencies.
Abstract: A novel dual-band microstrip antenna is demonstrated. The resonant frequencies can be varied over a wide frequency range and the input impedances are easily matched for both resonance frequencies. The radiation pattern is not affected by the modification for the dual-frequency operation. The design process is physically intuitive and relatively simple. >
7 citations
18 Jun 1992
TL;DR: In this article, the improvement in bandwidth when a parasitic element is used along with the short circuit patch has been theoretically analyzed and practically observed, and it has been shown that the parasitic element can improve the performance of short circuit patches at 1.6 GHz.
Abstract: The improvement in bandwidth when a parasitic element is used along with the short circuit patch has been theoretically analyzed and practically observed. The quarter wave microstrip element is designed for operation at 1.6 GHz with a substrate of dielectric constant 4.8 and thickness 1.6 mm. The bandwidth of the short circuit patch with a 1-m*1-m ground plane mount is 55 MHz; the measured value of the center frequency is 1.587 GHz; the beam width is 86 degrees and its gain is 11.5 dB. The bandwidth of the short circuit patch with the parasitic element with a 1-m*1-m ground plane mount was 204 MHz, and the center frequency was measured as 1.47 GHz, with a beam width of 78 degrees and a gain of 11.6 dB. >
6 citations
01 Oct 1992
TL;DR: In this paper, a microwave lens of Rotman type, to be used in a broadband multibeam antenna, has been designed in microstrip technology and the method of analysis used, based on a ray approach, is briefly described and compared for a circular geometry with a, in some respect, rigorous method.
Abstract: A microwave lens of Rotman type, to be used in a broadband multibeam antenna, has been designed in microstrip technology. The method of analysis used, based on a ray approach, is briefly described and compared for a circular geometry with a, in some respect, rigorous method. The design of a Rotman lens with 15 beam ports and 15 antenna element ports is described as are the measured and calculated transmission through the lens and the arrayfactor as calculated from the measured transmission coefficients.
6 citations
01 Aug 1992
TL;DR: In this paper, a combination of patch dimensions and aperture size determines the antenna's resonating frequency and measured return loss indicated an achievable bandwidth of 1.2% for a VSWR of less than 2:1.
Abstract: Aperture-coupled microstrip antennas have been developed for operation in the millimeter wave region. A combination of patch dimensions and aperture size determines the antenna's resonating frequency. The measured return loss indicated an achievable bandwidth of 1.2% for a VSWR of less than 2:1. The measured radiation patterns at 45 GHz display the expected characteristics of microstrip patch antennas. Measurement of several antennas confirms the repeatability of the results.
6 citations
18 Jun 1992
TL;DR: In this article, the authors present an analysis of the electromagnetic coupling between a twin-lead transmission line and a dipole element and verify the computed coupling value by measuring the coupling between the single-wire transmission and a monopole above a ground plane.
Abstract: The authors present an analysis of electromagnetic coupling between a twin-lead transmission line and a dipole element. The computed coupling value was verified by the measurement of the coupling between a single-wire transmission line and a monopole above a ground plane. An analysis of the coupling between a transmission line and a linear array of dipole elements over a ground plane was also developed. An experiment involving the measurement of the coupling between a single-wire transmission line and a linear array of monopoles in a parallel-plate waveguide was performed. The measured data compared favorably with the calculated data. >
6 citations
18 Jun 1992
TL;DR: In this article, an FET source is integrated with a multilayer slot coupled patch antenna, and a design procedure is given and the performance of an X-band prototype circuit is described.
Abstract: The authors describe a novel active radiating module in which an FET source is integrated with a multilayer slot coupled patch antenna. A design procedure is given and the performance of an X-band prototype circuit is described. Prototype circuits showed 4.81-mW power output and 50-MHz tuning range at 4.893 GHz. The initial results suggest that this device has potential for use in low-cost transmitters, active arrays, spatial power combiners and quasi-optical combiners. >
6 citations
TL;DR: In this article, an experimental investigation was carried out into the operation of an electromagnetically coupled (EMC) microstrip patch antenna consisting of double-layer dielectrics with a microstrip feed line in between.
Abstract: An experimental investigation is carried out into the operation of an electromagnetically coupled (EMC) microstrip patch antenna consisting of double‐layer dielectrics with a microstrip feed line in between. The input impedance of the antenna is studied as a function of the patch width, the patch‐feed overlap, and the dielectric constants of two layers. © 1992 John Wiley & Sons, Inc. Copyright
4 citations
18 Jun 1992
TL;DR: In this paper, the authors considered the limiting case of grated patches in the sense that the microstrip dielectric is air and the quasi-microstrip antenna consists of a linear array of narrow printed strips (or thin cylindrical wires) that are far apart compared to their width (radius).
Abstract: In the present work, the authors consider the limiting case of grated patches in the sense that the microstrip dielectric is air and the quasi-microstrip antenna consists of a linear array of narrow printed strips (or thin cylindrical wires) that are far apart compared to their width (radius). The efficiency of such an antenna should be the upper limit on the efficiency of a true microstrip version. The predicted impedances, current distributions, efficiencies, and far-field patterns of these antennas, as well as measured patterns on an eleven-element antenna around 2 GHz, are presented. >
2 citations
TL;DR: In this paper, a theoretical analysis of an E-plane gap-coupled rectangular microstrip array antenna with one center-fed patch and several parasitic elements is presented, where the antenna characteristics such as radiation pattern and return loss are computed theoretically and compared with experimental results for illustrating the usefulness of this method.
Abstract: The purpose of this article is to present a theoretical method for analyzing an E-plane gap-coupled rectangular microstrip array antenna which consists of one center-fed patch and several parasitic elements by use of the transmission-line model and the equivalent circuit parameters for the capacitive gap between microstrip patch and the open end of the patch. Antenna characteristics such as radiation pattern and return loss are computed theoretically and compared with experimental results for illustrating the usefulness of this method.
2 citations
Patent•
07 Feb 1992TL;DR: An antenna comprises a microstrip transmission line which includes a strip conductor and a ground plane conductor separated by a dielectric substrate; a portion of the substrate being adapted to enable energy within the substrate to radiate away from the microstrip transmit line as mentioned in this paper.
Abstract: An antenna comprises a microstrip transmission line which includes a strip conductor and a ground plane conductor separated by a dielectric substrate; a portion of the substrate being adapted to enable energy within the substrate to radiate away from the microstrip transmission line. To permit frequency-scanning, the substrate has an antenna portion formed therein which is adapted to permit RF energy supplied to the microstrip transmission line to be directionally radiated away from the microstrip transmission line at the antenna portion, the direction of radiation being a function of the frequency of the supplied energy. The substrate may have greater capacitance at said antenna portion than at other portions of said substrate.
18 Jun 1992
TL;DR: The effect of the addition of a multiple-layer radome on the scattering performance of a single patch antenna is shown along with the scattering from arrays of various sizes as a function of frequency.
Abstract: The effects of multiple-layer superstrates on the scattering from finite microstrip array antennas are studied. Results were obtained using the spectral-domain moment method. Use was made of a massively parallel multiple-instruction multiple-data (MIMD) microstrip array analysis FORTRAN computer program developed for hypercube architectures. The effect of the addition of a multiple-layer radome on the scattering performance of a single patch antenna is shown along with the scattering from arrays of various sizes as a function of frequency. >
11 Aug 1992
TL;DR: In this paper, the use of a rectangular aperture for the coupling of a microstrip line to a patch antenna, a dipole antenna, or another microstrip antenna is explored, and the relevant theoretical and experimental results are reported.
Abstract: The use of a rectangular aperture for the coupling of a microstrip line to a patch antenna, a dipole antenna, or another microstrip antenna is explored. The relevant theoretical and experimental results are reported. It is noted that the circuits considered here should have many applications for phase arrays, MMIC and MIC packaging, and microwave circuit interconnects.
11 Aug 1992
18 Jun 1992
TL;DR: In this paper, a rigorous analysis of the mutual coupling admittance between two transverse series-fed dipoles by proximity-coupled versus element spacing is presented, and a comparison between measurements and theory has shown good agreement.
Abstract: A rigorous analysis of the mutual coupling admittance between two transverse series-fed dipoles by proximity-coupled versus element spacing is presented. A comparison between measurements and theory has shown good agreement. Thus, this method of calculation, considering the radiating elements as a two-port model, can be included in a synthesis of a linear array of microstrip antennas electromagnetically series-fed; this type of array is more easily manufactured than a microstrip array electromagnetically parallel-fed. >