This paper presents a new synthesis procedure for arbitrary symmetrical 4 port networks which uses four 180° hybrids. A realization in planar technology is also proposed. It makes us of the microstrip-slotline 180° tee. 

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

Crosstalk phenomena and pulse propagation in coupled microstrip lines on insulating and semiconducting substrates are analysed. Propagation characteristics of these lines are obtained by Spectral Domain Analysis in order to avoid any error involved by the use of analytical model and T.E.M. approximation. Time domain results are calculated by a conventional fast Fourier transform. Effects of semico

Conformal mapping techniques are used to give design information for coplanar directional couplers with lower ground plane. The analysis leads to analytic closed-form expressions for the coupler parameters and gives the limit beyond which a dominating coplanar waveguide behaviour cannot be assured. Experimental results on a 8.2 dB coupler designed from these calculations have shown reasonably good

An Offset microstrip step discontinuity is studied by the generalized scattering matrix technique in conjunction with modified residue calculus technique. This method is numerically efficient and the validity of its results is confirmed by comparison with existing data. 

The effect of finite metallization thickness and mounting grooves on the propagation characteristics of suspended coupled striplines is investigated with a rigorous and versatile hybrid mode analysis. Presented results demonstrate that increasing metallization thickness lowers the propagation constants of both quasi-TEM modes, whereas the propagation constant of the slot mode shows an increasing t

The paper describes a new type of microstrip circulator which is constructed on a metal plate-backed Teflon laminate. A theoretical investigation of the split-resonance bandwidth for different microstrip circulator types is carried out using a mode matching technique. The theoretically scattering parameters of the ferrite junction are -compared to practical measurements. Results obtained from a th

An accurate full-wave hybrid-mode analysis of the transmission property of micros trip line lying on lossy ferrite material magnetised perpendicularly to the ground plane is provided in terms of the spectral domain technique. This approach means a more realistic insight into behaviour of reciprocal and nonreciprocal integrated micros trip ferrite devices since for the first time it rigorously take

Improved oversized waveguide components of transmission lines developed for high-power (200 kW) millimetre wave applications at 28, 70 and 140 GHz, as e.g. electron cyclotron resonance heating (ECRH) of plasmas for thermonuclear fusion research with gyrotrons, are described. Axisymmetric narrow pencil beams with well-defined polarization (HE11 mode) are used at openended corrugated waveguide an

The theoretical study of an asymmetrical iris, inserted in a circular waveguide, is accomplished by means of two different techniques: mode matching and integral equation. Both methods allow the computation of the Generalized Scattering Matrix of the discontinuity. Comparison between the two techniques are presented. Transmission and reflection properties of a single iris are computed and validate