Adalbert Beyer

Finline Taper Design Made Easy

In this paper a method is presented which permits the quick and exact fabrication of tapers in finline technique. This method uses tapers in the form of circular area which are matched to the slotwidth as a function of the characteristic impedance. For the application of the described method the field distributions and the characteristic impedances of finlines must be known.

A Fin Line Ferrite Isolator and Circulator for the R-Band

First approaches of a fin line Y-circulator and a fin line resonance isolator are described, and experimental data of the performance are reported. The Y-circulator consist of a antipodal fin line Y-junction with three impedance transformers and a ferrite sphere as magnetically active element. The inhomogeneous fin lin tapers are mounted in the E-plane across the center of a rectangular R-band waveguide. For the optimization of the circulator tapers various antipodal fin line contour functions are calculated and a cos2-taper is chosen. The resonance isolator in fin line technique is realized using a thin slab of ferrite which is placed in a plane of circularly polarized magnetic field in an unilateral fin line. The field distributions are discussed and first preliminary experimental results are presented.

Development of a Coupler in Finline Technique

Among other components directional couplers are employed in millimeterwave finline circuits. The method presented here allows a simple calculation of all modes which can exist on such couplers under consideration of the thickness of the metallization. In this way a 3-dB coupler has been developed for the Ka-band. Numerical and experimental results illustrate the applicability of this method.

A Field Theoretical Analysis of Ferrite-Loaded Image Line Isolators for the Ka-Band

A ferrite isolator in image line technique is investigated both theoretically and experimentally. The used theoretical analysis method allows an exact description of the electromagnetic field in a multilayered structure. The feasibility of a dielectric image line field displacement isolator for the Ka-band is demonstrated.

ELECTRICAL CHARACTERIZATION OF INTEGRATED CIRCUITS BY SCANNING FORCE MICROSCOPY

Abstract A new contactless device internal test technique based on a scanning force microscope is presented, enabling electrical characterization of integrated circuits (ICs) with both high spatial and temporal resolution. For the first time a comparison of experimental results obtained with the scanning force microscopy test system and network analyser by characterizing the same IC is shown up to 20 GHz. A new electrical tip-sample interaction model is introduced, enabling calculations of the achievable spatial resolution by this test technique.

Coplanar Short Considered by the TLM-Method with Symmetrical Condensed Nodes

This paper presents numerical results on transmission behavior and field distribution of a coplanar discontinuity obtained by the help of the TLM-method. The applicability of this field theoretical technique to practical structures is shown on the example of an 50¿ coplanar short arrangement. A number of frequency points is calculated in a single computation run using this time domain method is used.

Planar Slotline Millimeterwave-Resonators with Coplanar Coupling

This paper adresses a new way for optimizing integrated high Q slotline resonators for millimeterwave applications. The procedure is carried out in two steps. First, the problem of coupling of the incident wave into the resonator is solved numerically with the help of orthogonal raw-expansion method. Secondly, the input impedance of the resonator is calculated, and from this an equivalent circuit for a parallel - respectively serial - resonance is optimized. The appicability of the method presented here is shown by measurement. The results of this procedure are used for MMIC applications as for dimensioning filters and even complete oscillators.

Power Density Distribution Analysis of Ferrite Loaded Finlines for the Development of Integrated Nonreciprocal Millimeter Wave Elements

A hybrid mode field analysis for a finline loaded with a ferrite- and additionally a dielectric speciem is presented. Using this theory the power density distribution of forward and backward waves is calculated and demonstrated. The results are used to design a finline isolator for the 28.5 GHz range with a bandwidth of 2 GHz, an insertion loss smaller than 1.2 dB and an isolation higher than 39 dB.

Advanced phase-locked-loop oscillators

This article presents a very sophisticated subclass of communication subsystems, namely oscillators, that use the phase-locked loop (PLL) technique. Some basic features and several application examples are presented that enable locking in the oscillator signal for each frequency offset. If the oscillator is used on its fundamental frequency, a high spectral purity is achieved without additional distortion. Furthermore, it can be increased by the filter function of the loop. An integrated 70 GHz synthesizer is introduced and discussed, and a microwave synthesizer module and its technical behavior is described. Several measured results supported by analytical considerations show the applicability and the high performance of the PLLs introduced.

Application of the TLM-method for the analysis of longitudinally periodic structures

The paper delivers new aspects to the TLM-method applied to longitudinally periodic structures. This contribution explains the main features of the method like the parameter estimation and the phase walls derived from the Floquets theorem as well as examples and compares the obtained results to analytical solutions and measurements.