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A compact planar crossover with two intersecting channels is proposed. This crossover is constructed by a patch resonator and two cross-slotted lines. Moreover, the longer the cross slotted lines are, the smaller the proposed planar crossover is. In order to simplify the analysis of the proposed planar crossover, the approximate two-port equivalent circuit is provided. The measured performances match...
Simple closed-form design equations (or solutions) for microwave absorbers with high absorption and wide bandwidth are derived based on an equivalent circuit. One interesting fact about the solution is that the zero slope (of the reactance or the susceptance) condition has been used. For an absorber with a certain center frequency, the equivalent circuit values are determined using the presented design...
In this paper, we propose the study of reactive impedance surface (RIS), used especially as reflector for antenna miniaturization, with MoM-GEC method. The electromagnetic modeling using integral methods, such as MoM-GEC, is of great interest because they are the most appropriate to study planar structures, since they provide the reduction of the problem's dimension. Hence, they permit the gain in...
Microwave pulse compression systems using a waveguide cavity composed by an inductive iris and an H-plane T-junction with the primary arm shorted is studied using the individual components' equivalent circuits. The equivalent circuit model of the device is studied in detail and optimized design characteristics and performance figures such as the length of the waveguide cavity, the iris width, the...
The paper suggests network synthesis algorithm used limited band scattering parameters of microwave devices. The proposed approach is based on the simple description of the microwave structures using lumped element network. The submitted example of synthesis illustrates the microstrip filter design.
The modeling of passive microwave structures by equivalent circuit models is an efficient technique which allows to include distributed problems into complex modeling environments at a system level. However, when synthesizing lumped element circuits for electromagnetic structures with large internal propagation delays, the obtained impedance functions exhibit a large number of frequency poles in a...
Marcuvitz played a key coordinating role in his classic book The Waveguide Handbook, which had an enormous impact on developing the microwave field. The Waveguide Handbook is the most important and most widely used book in the history of the microwave field. The book contained the largest collection of theoretical expressions for waveguide discontinuities available anywhere and, in this respect, it...
A planar helix slow-wave structure comprised of a pair of unidirectionally conducting screens was analyzed for its equivalent circuit parameters. These parameters were interpreted for the structure dispersion characteristics and, subsequently, the structure interaction impedance and the Pierce's gain parameter of a planar-helix TWT. For identical situations with respect to the structure parameters,...
In this paper, we propose a circuit model of the multi-walled carbon nanotube (MWCNT) based on our one-dimensional fluid model, which describes the electron transport in single-walled carbon nanotube (SWCNT). The performances of MWCNT and SWCNT in high frequency (RF/microwave) applications are then simulated using these models and compared with Cu interconnect. Simulations show that MWCNT interconnects...
In pulse shaping circuits, a transmission line having characteristics of higher impedance, fast transition, low insertion loss is needed. Elevated Coplanar Waveguide (ECPW) has been identified as the transmission line to achieve such characteristics. An equivalent circuit model for ECPW based on the S-Parameter approach is proposed and the RF performance is obtained. The proposed model reveals that...
In designing and manufacturing of high speed digital circuits it is important to develop a transmission line having characteristics of a higher phase velocity, higher impedance, low insertion loss. Elevated coplanar waveguide (ECPW) has been identified as the transmission line to achieve such characteristics. Mesh less based collocation method for analyzing the ECPW structure has been developed. The...
The next generation of wireless communication is a ubiquitous radio system concept, providing wireless access from short-range to wide-area, with one single reconfigurable and adaptive system for all envisaged radio environments. This paper presents the design approach of RCO (reconfigurable concurrent oscillator) that simultaneously generates two or more signals of different frequencies that eliminate...
In this paper, the design of a compact planar bandpass filter above a defected ground plane is presented. The filter is designed as a combination of microstrip resonators and exploits the properties of a planar electromagnetic bandgap (EBG) structure patterned unto the ground plane of the printed circuit board material to provide a very wide stopband of up to 5 times the fundamental frequency. The...
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