Showing papers on "Microstrip antenna published in 1968"
••
TL;DR: In this article, a method for computing the line capacitance of a microstrip line based on the application of Fourier transform and variational techniques is reported, where the characteristic impedance, guide wavelength, and the surface potential distribution in the micro-strip line are obtained for a range of structure parameters and the dielectric constant.
Abstract: This paper reports a method for computing the line capacitance of a microstrip line based on the application of Fourier transform and variational techniques. The characteristic impedance, guide wavelength, and the surface potential distribution in the microstrip line are obtained for a range of structure parameters and the dielectric constant. The results calculated from the expressions developed in the paper are compared with the theoretical results presently available in the literature and good agreement is found. Comparison with available experimental results is also made where feasible. Possible applications and limitations of the method are discussed.
254 citations
••
TL;DR: In this paper, a theoretical analysis of a shielded double-layer microstrip line is presented based on a variational calculation of the capacitance in the Fourier-transformed domain and on the charge density distribution as a trial function.
Abstract: A theoretical method is presented by which microstrip-like transmission lines can be analyzed. These transmission lines are characterized by conducting strips, large ground planes, multi-dielectric-layer insulation, and planar geometry. The method is essentially based on a variational calculation of the line capacitance in the Fourier-transformed domain and on the charge density distribution as a trial function. A shielded double-layer microstrip line is analyzed by this method. Derived formulas for this structure are also applicable to simpler structures: a double-layer microstrip line, a shielded microstrip line, and a microstrip line. The calculated values of the line capacitance and the guide wavelength are compared with the measured values where possible. Oxide-layer effects on a silicon microstrip line and shielding effects on a sapphire microstrip line are also discussed based on this theory. The limitations and possible applications of this method are described.
220 citations
••
20 May 1968TL;DR: A detailed experimental investigation has brought to light two important aspects of circuit design with microstrip: first, microstrip has an upper frequency limit and second, it is dispersive.
Abstract: Recently there has been considerable interest in the use of the open microstrip geometry as a transmission line in microwave integrated circuits. This form of propagating structure is applicable to a monolithic approach on a semiconductor substrate as well as to a hybrid approach using a ceramic substrate. In order to choose suitable materials, we have investigated the basic properties of microstrip and its interactions with the substrate. A detailed experimental investigation has brought to light two important aspects of circuit design with microstrip. First, microstrip has an upper frequency limit and second, it is dispersive.
50 citations
••
01 Nov 1968TL;DR: In this paper, the radiation properties of a simple spherical phased array of 16 flat spiral antennas have been investigated experimentally over a frequency range of 0.6 GHz to 3 GHz, and the results indicated that such an array is capable of operating with widely spaced antenna elements.
Abstract: The radiation properties of a simple spherical phased array of 16 flat spiral antennas have been investigated experimentally over a frequency range of 0.6 GHz to 3 GHz. The results obtained indicate that such an array is capable of operating with widely spaced antenna elements. The spherical array surface considerably reduces the grating lobe amplitudes in the pattern, thereby making the array broad-band. The polarization characteristics of the radiation field were also studied.
13 citations
••
TL;DR: In this paper, a non-reciprocal tunable YIG filter in a microstrip configuration has been constructed which makes use of a novel method of generating a circularly polarized field in the plane of the microstrip circuit.
Abstract: A nonreciprocal tunable YIG filter in a microstrip configuration has been constructed which makes use of a novel method of generating a circularly polarized field in the plane of a microstrip circuit. Nonreciprocities in excess of 40 dB have been obtained at X band with relatively low insertion loss and VSWR.
••
01 Apr 1968
TL;DR: Aperture-admittance expression for waveguide-fed rectangular aperture antenna, loaded with dielectric plug as mentioned in this paper, for a single-input single-output (SISO) antenna.
Abstract: Aperture-admittance expression for waveguide-fed rectangular aperture antenna, loaded with dielectric plug
•
05 Jul 1968
TL;DR: In this article, the authors describe the antenna system, which consists of six like lineal CONDUCTORS of equal length and length, and switch between them in the center-center area.
Abstract: ANTENNA SYSTEM COMPRISING SIX LIKE LINEAL CONDUCTORS OF EQUAL LENGTH AND DISPOSED ON AXES RADIATING FROM A COMMON CENTER, EACH CONDUCTOR BEING AT AN ANGLE OF 90 DEGREES FROM THE ADJACENT FOUR ELEMENTS, AND SWITCHING MEANS IN THE CENTER AREA TO CONNECT COMBINATIONS OF THREE ADJACENT CONDUCTORS TO ONE LEAD-IN AND THE REMAINING CONDUCTORS TO THE OTHER LEAD-IN.
••
TL;DR: In this article, the authors show that mutual coupling between the launcher and rod-end apertures of a uniform cylindrical dielectric-rod antenna is responsible for certain second-order effects in the radiation pattern.
Abstract: Computed and measured data show that mutual coupling between the launcher and rod-end apertures of a uniform cylindrical dielectric-rod antenna is responsible for certain second-order effects in the radiation pattern. The synthesis of a smooth tapered dielectric antenna by a stepped profile and complications arising from interstep coupling are also discussed.