Showing papers on "Coplanar waveguide published in 1984"

General technique for the integration of MIC/MMIC'S with waveguides

Abstract: A technique for packaging and integrating of a microwave integrated circuit (MIC) or monolithic microwave integrated circuit (MMIC) with a waveguide uses a printed conductive circuit pattern on a dielectric substrate to transform impedance and mode of propagation between the MIC/MMIC and the waveguide. The virtually coplanar circuit pattern lies on an equipotential surface within the waveguide and therefore makes possible single or dual polarized mode structures.

Coplanar and stripline probe card apparatus

Abstract: Coaxial cables each having a cylindrical electrically conductive outer shield and a central conductive wire insulated from the shield are conductively coupled through a connector to coplanar conductors on a dielectric substrate. The conductors converge toward an opening in the substrate. The coplanar conductors alternately are ground and signal conductors. Each coaxial cable shield is conductively coupled to two ground conductors and the cable wire is conductively coupled to the signal conductor between the two ground conductors. At the substrate opening the ground and signal conductors are conductively coupled to planar stripline waveguide ground and signal blades, respectively. Ground blades between the signal blades are a factor in controlling the signal blade impedance and provide isolation between the signal blades. Each blade is perpendicular to the substrate and has a pitch angle such that the blade extends through the opening below the substrate. A wire or needle probe is conductively coupled to the blade distal end. The needle end is adapted to contact a conductive pad on an IC (integrated circuit) chip. The coplanar conductors and stripline blades are configured to maintain substantially constant characteristic impedance in the signal conductors and their respective blades and to isolate signals in the signal conductors and blades from one another.

Characteristics of Metal-Insulator-Semiconductor Coplanar Waveguides for Monolithic Microwave Circuits

Abstract: Using a full-wave mode-matching technique, an extensive analysis is presented of the slow-wave factor, attenuation, and characteristic impedance of a metal-insulator semiconductor coplanar waveguide (MISCPW) as functions of the various structural parameters. Design criteria are given for low-attenuation slow-wave propagation. By a proper optimization of the structure, performances comparable with or even better than those of alternative structures proposed in the literature are theoretically predicted.

Theoretical and Experimental Investigation of Asymmetric Coplanar Waveguides (Short Papers)

Abstract: Conformal mapping techniques are used to obtain analytic closed-form expressions for the characteristic impedance and the relative effective dielectric constant of asymmetric coplanar waveguide with infinite or finite dielectric thickness. The line asymmetry leads to a decrease of its characteristic impedance and to an increase of its relative effective dielectric constant. Six asymmetric coplanar waveguides are realized and their characteristic impedances are measured using time-domain reflectometry techniques. The experimental results show very good agreement with the theoretical ones.

Theoretical and Experimental Investigation of Asymmetric Coplanar Waveguide

Abstract: Conformal mapping techniques are used to obtain analytic closed-form expressions for the characteristic impedance and the relative effective dielectric constant of asymmetric coplanar waveguide with infinite or finite dielectric thickness. The line asymmetry leads to a decrease of its characteristic impedance and to an increase of its relative effective dielectric constant. Six asymmetric coplanar waveguides are raised are their characteristic impedances are measured using time domain reflectometry techniques.

Microwave integrated optical modulator

Abstract: A Ti‐diffused lithium niobate, traveling wave modulator has been fabricated and tested at microwave frequencies. A Mach–Zehnder interferometer optical configuration and a coplanar waveguide electrical transmission line are used. For a 4‐mm interaction length, the modulator has a 3‐dB bandwidth of 13 GHz and requires only 2 V to switch at λ=840 nm. The frequency response is measured directly using an ultrahigh speed photodiode, and the test setup therefore constitutes the highest bandwidth efficient electro‐optical transmission system ever reported.

Stable impedance ribbon coax cable

Abstract: A ribbon coax cable comprises a plurality of parallel and coplanar center conductors each surrounded by a dielectric sheath, a conductive member surrounding each dielectric sheath, a plurality of coplanar drain conductors each of which extends parallel to a respective center conductor and in electrical engagement with the conductive member, an elastomeric material surrounding the conductive members and the drain conductors which maintains the drain conductors and the conductive members in electrical engagement along the entire length of the cable.

Coplanar flip‐chip mounting technique for picosecond devices

Abstract: We present a coplanar flip‐chip mounting technique for broadband microwave and high‐speed opto‐electronic devices. The technique is based on coplanar waveguides with tapered structures that can be fabricated with high precision by photolithographic means on planar dielectric substrates and device chips. It allows the inclusion of micrometer size devices into broadband circuits and serves for the transmission of high‐speed signals with low reflection over waveguides with varying geometry and to external coaxial lines with millimeter dimensions. As demonstrated by flip‐chip mounted high‐speed photoconductors, by a coplanar pulse‐forming circuit, and by a coplanar line termination, this technique allows broadband transmission with reflections not exceeding a few percent in the frequency range from dc to 25 GHz and signal durations at least as short as 20 ps.

Reduction of Propagation Losses in Coplanar Waveguide

Abstract: Coplanar Waveguide (CPW) is finding increasing use in microwave and millimeter wave integrated circuits. CPW has several advantages over microstrip, but its ohmic loss tends to be larger because of the concentration of its currents near the metal edges. Two methods for reducing ohmic loss in CPW are proposed and studied using a numerical technique. It is shown that the propagation loss can be reduced by approximately a factor of four.

Effect of Inner Conductor Offset in a Coplanar Waveguide

Abstract: This paper reports on the effect of structural offset in a coplanar waveguide on the characteristic impedance and fine loss. This effect can be an appreciable factor in designing highy precise circuits, such as MIC's using coplanar waveguide, or a coplanar-type standing-wave detector. The electric field over the cross section of the line is analyzed by assuming a TEM mode of wave propagation, and solving a two-dimensional Laplace's equation by means of the successive over-relaxation method. In the analysis, an approximate solution based on symmetry is employed. Also, measurements are made, to confirm the results thus obtained.

Generalized Spectral Donain Analysis of Planar Steuctuees Having Semi-Infinite Ground Planes

Abstract: Accurate, efficient techniques that utilize the general Galerkin's method in Fourier transform domain are formulated to compute the quasi-TEM parameters of planar structures having semiinfinite strips. Examples include coplanar waveguides with and without the conductor backing and microstrips with a parallel slot in the ground plane. Computed results for typical cases of symmetrical, nonsymmetrical, single and multiple strip coplanar waveguide and microstrip-slot structures are presented.

Coplanar Schottky variable phase shifter constructed on GaAs substrate for millimeter-wave application

Abstract: A Schottky contact variable phase shifter constructed on either uniformly or periodically doped GaAs substrate is discussed in details. The device can operate at millimeter-wave frequencies with reasonably low attenuation.

Integrated dielectric waveguide radar front end device

Abstract: OF THE DISCLOSURE A monolithic waveguide radar front end subsystem utilizing dielectric components. The use of dielectric waveguide transmission elements permits conformal mounting while exhibiting operating characteristics comparable to those of conventional metal waveguide subsystems.

Analysis of coplanar waveguide with finite ground planes

Abstract: Analyse des proprietes de transmission d'un guide d'onde coplanaire avec des plans de sol finis par la methode du domaine spectral. Pour une epaisseur de substrat donnee, la constante de phase resultante et l'impedance caracteristique sont ameliorees par rapport au guide d'onde coplanaire traditionnel

Coplanar Schottky variable phase shifter

Abstract: : A coplanar Schottky variable phase shifter is studied. This device has a simple configuration and is suitable for monolithic integration. The device uses the electronic variability of the depletion layer thickness of the Schottky contact under the coplanar waveguide to change the amount of the phase shift. A periodic structure is introduced to reduce a loss caused by the existing semiconductor material which has a finite conductivity. An integral equation is formulated and solved by the point-matching method. The analysis allows one to predict the phase shift the attenuation in the device. It is shown that such a device can operate at millimeter-wave frequencies with a very small loss. A simple measurement confirmed these predictions. (Author)

Theoretical and experinent~ investigation of asymmetric gdplanar waveguide s

Abstract: Conforrnal msppi% techniq~s are used to obtain analytic closed-form expressions for the cha– ra~teristic impedance aad the relative effective dielectric constant of asymmetric coplanar waveguide with infinite or finite dielectric thick– ness. The line asymmetry leads to a decrease of its characteristic impedance and to an increase of its relative effective dielectric constant. Six asymmetric coplanar wveguides are re~ised ati their characteristic impedances are meaaured using time domain reflectometry techniques.