Showing papers on "Coplanar waveguide published in 1977"

Apparatus for launching or detecting waves of selected modes in an optical dielectric waveguide

Abstract: A launcher for waves of selected mode in an optical dielectric waveguide having a core surrounded by cladding, in which the launcher includes a prism of refractive index greater than that of the waveguide and preferably greater than that of the core of the waveguide which is placed against the waveguide either before or alongside an outwardly tapering portion of the waveguide. Light from a laser is directed through the prism on to the waveguide to induce the waves in the waveguide. A matching fluid, which may set to a solid, improved the coupling of the prism to the waveguide. A detector of similar construction is also described, the tapering of the waveguide being inward.

Spectral Domain Solution of Arbitrary Coplanar Transmission Line with Multilayer Substrate (Short Papers)

Abstract: A hybrid mode analysis is presented for a multilayer dielectric within a rectangular conducting box. An arbitrary set of conductors may be distributed along the lower surface of the top layer, so that single or coupled forms may be analyzed of slot line, microstrip, or coplanar waveguide. The analysis combines a transfer-matrix approach with the spectral domain method to give a versatile and efficient solution. CPU time on an IBM 360/65 is about 1 s per layer of substrate, for a single slot or strip, at one frequency.

Dissipation Loss Effects in Isolated and Coupled Transmission Lines

Abstract: This paper describes a computer-aided analysis of dissipation losses in uniform isolated or coupled transmission lines for microwave and millimeter-wave integrated-circuit applications. The analysis employs a quasi-TEM model for isolated transmission lines and for the even- and odd-mode transmission lines associated with coupled-line structures. The conductor and dielectric losses are then related to equivalent charge density distributions, which are evaluated using a method-of-moments solution. The transmission lines treated by this analysis may contain any number of Iossy conductors and inhomogeneous dielectrics, consisting of any number of different homogeneous dielectric regions. A development is provided to explicitly relate the four-port terminal-electrical performance of directional couplers to evaluated even- and odd- mode loss coefficients. Examples of evaluated losses are presented in graphical form for isolated lines of inverted microstrip and trapped inverted microstrip and edge-coupled microstrip with a dielectric overlay. The analysis accuracy has been confirmed using microstrip and coplanar waveguide configurations. A comparison is made of the total loss characteristics for microstrip, coplanar waveguide, inverted microstrip, and trapped inverted microstrip. Calculations are compared with measurements for the coupled-line structure. Accuracy of the solution and suggested refinements are discussed. Five computer programs are documented.

A Broad-Band Frequency Divider Using Microwave Varactors

Abstract: A novel configuration using GaAs varactors in a balanced circuit configuration incorporating both coplanar waveguide and microstrip elements permits the construction of microwave frequency dividers which have near-octave divide-by-two bandwidth and excellent response to pulsed RF inputs.

Broadband Frequency Dividers Using Microwave Varactors

Abstract: A novel configuration using GaAs varactors in a balanced circuit incorporating both coplanar waveguide and microstrip elements has permitted the construction of frequency dividers which have near-octave divide-by-two bandwidth and excellent response to pulsed r.f. inputs. The design and performance of such a frequency divider for inputs in the 4 to 8 GHz range is discussed.

Basic Parameters of Nonsymmetrical Coplanar Line

Abstract: The wavelength of a guided wave in nonsymmetrical coplanar line on substrate with relative permittivity constant in range from 2 to 110 was measured at frequencies from 2.5 to 10 GHz. A comparison with theoretical relation calculated from simplified TEM model was done.

Microstrip circuit having coplanar waveguide port

Abstract: A microwave integrated circuit component comprises a dielectric substrate layer having an electrically conducting circuit on one face and an electrically conducting ground electrode on the other face. Two electrically conducting strips extend from the ground electrode round the edge of the substrate to lie alongside a part of the circuit. The circuit is contained within a box which carries at least one connector in its side walls for connecting the integrated circuit with external co-axial lines.

Measurement of the effective relative permittivity of unshielded coplanar waveguides

Abstract: The dependence of the effective relative permittivity of coplanar waveguides is measured as a function of frequency in the frequency range from 3-12 GHz and is compared with the computed values.

Impedance matched coupling device for microwave tubes

Abstract: A coupling device for a microwave tube including a first length of waveguide and a second length of waveguide of rectangular cross-section. The two lengths of waveguide are connected together and have their free ends coupled when operating to a load and to the tube respectively. The large side of the cross-section of the second length of waveguide is equal and parallel to the corresponding side of the first length of waveguide. The small side of the cross-section of the second waveguide is several times smaller than the corresponding side of the first waveguide. Two connected lengths of waveguide form a transition. The first waveguide contains an iris and the coupling device forms an assembly of matched impedance.

Dielectric waveguide with electrodes and production of the same

Abstract: PURPOSE:To reduce loss for propagating light of a dielectric waveguide with electrodes by covering the faces of the waveguide of two-dimensional construction provided on a substrate, other than the face in contact with the substrate with a clad composed of dielectric.

A Low Noise FET Amplifier in Coplanar Waveguide

Abstract: This paper describes on the advantages of figures of 2.2 dB at the factors affecting the performance of low noise FET amplifiers, with particular emphasis coplanar waveguide as the microwave circuit. RF results include overall amplifier noise 7.5 GHz from devices made from two quite different GaAs structures.

Dispersion in Shielded Planar Transmission Lines on Two-Layer Composite Substrate

Abstract: The singular integral equation technique has been used to analyze a shielded planar transmission line, which allows one to calculate the dispersion characteristics of shielded microstrips on two-layer substrates as well as the effect of shielding on coplanar waveguides. Dispersion curves for suspended substrate microstrips and the variation of the relative phase velocity, with frequency, of coplanar waveguide (CPW) on alumina substrates of finite thicknesses and variable ground plane positions are presented. The results of computations with the lowest order 4 x 4 determinant show good agreement with the available data.

Apparatus for coupling microwave energy from two oscillators to a common transmission line

Abstract: A microwave system provides signals of two separate microwave frequencies, designated F.sub.(1) and F.sub.(2), alternately or simultaneously to a common coaxial transmission line by combining the outputs of two microwave frequency oscillators of frequencies F.sub.(1) and F.sub.(2). Each oscillator contains a waveguide output with which is associated at least one means, such as a resonant iris, for passing microwave energy of the oscillator's design frequency and for reflecting microwave energy of other frequencies, such as the different frequency of the other oscillator. A waveguide type transmission line is provided having first and second input ends and which line is of a length so as to be nonresonant at either of the two oscillator frequencies, F.sub.(1) or F.sub.(2). Each oscillator is coupled to a corresponding one of the two input ends of the waveguide. The waveguide is of a length in which signals of frequency F.sub.(1) form a field maxima at a certain location along the waveguide and in which signals of frequency F.sub.(2) form a field maxima along the waveguide at essentially the same said location. A microwave energy coupling probe is positioned in the waveguide at the location thereby defined to extract the microwave energy from the waveguide.

Field and Potential Distribution of Coplanar Strips

Abstract: The paper presents the investigations on potential and field distribution between two coplanar strips of finite width. By separating the inverse elliptic function of complex variable into real and imaginary parts, which are standard elliptic integrals with real arguments, exact expression for equipotential and flux lines are obtained. Negative of complex conjugate of the derivative of complex potential function gives field distribution as an explicit function of variable representing the co-ordinates of region around the coplanar strips. The expression for characteristic impedance is quite simple and is a function of strip dimensions only. The analysis is extended to the case of two wire transmission line using elliptic conductors with coplanar focal planes.