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This paper presents an investigation of a new wireless power transmission (WPT) system based on magnetic resonant coupling with introduced directional or additional coupled inductances. Two coupled resonant circuits reveal two resonant frequencies with highest efficiency of power transfer. It is suggested that a directional coupler or two additional coupled inductances can be used to track these resonant...
In the paper the direct solution of Maxwell equations in the rectangular waveguide filled with dielectric layers is presented. Each dielectric layer has different permittivity and losses. Metal losses in the bottom and top waveguide walls are taken into account. The two types of modes are found, which have five field components each. These modes are TEy and TMy, because they have only Hy component...
This paper describes the investigation on relative bandwidth, frequency range and thermal properties of the high directivity planar couplers realized in microstrip line technology. The basic idea is that coupling structure is attached to two transmission lines at two points only. The coupling structure is realized using SMD capacitances and inductances soldered to the microstrip lines. Frequency limit...
We present results of equivalent-circuit modeling of center-conductor gap in coaxial connectors. We perform broad-band full-wave electromagnetic simulations of the connector interface and then model their results with a simple equivalent circuit. We further show that the model parameters have simple physical interpretation. Our results can be used to improve the accuracy of millimeter-wave scattering-parameter...
This paper describes the design method and realization of high directivity planar couplers realized in microstrip line technology. The basic idea is that coupling between two transmission lines is present at two points only. The coupling is realized by SMD capacitances soldered to the lines. The presented type of couplers is in close relation to two hole waveguide coupler. The proposed couplers have...
The new type of narrowband bandpass filter is presented. The design and realization of the filter in microstrip technology is described. The filter has been etched from YBCO thin film deposited on sapphire substrate. The filter has bandwidth of 0.2 %, RL better than 20 dB and a size of 2 inch in diameter. The structure consists of coupled half-wavelength resonators with additional cross couplings...
A voltage tunable bandpass filter is presented. The filter is realized in microstrip technology using two stepped-impedance resonators. The voltage tuning is provided by means of varactor diodes. The filter has fixed absolute bandwidth of 30 MHz in the frequency range from 375 MHz to 915 MHz. The insertion loss is lower than 5 dB and return loss better than 17 dB in the full tuning range. The out...
The tunable bandpass filter is presented. The filter is realized in microstrip technology employing two stepped-impedance resonators tuned with varactor diodes. The filter has constant absolute bandwidth of 30 MHz in the frequency range from 380 MHz to 920 MHz. The insertion loss is lower than 5 dB and return loss higher than 17 dB in the full tuning range. The out of band attenuation is higher than...
Lossy inverters have been used recently to describe circuits with lossy couplings. The subject is important for microwave filters design as well as for coupled transmission lines analysis and measurements. In this paper it is shown that lossy inverters do not satisfy the passivity condition. They should be considered as active circuits. On the base of coupled dielectric resonators examples new models...
The design and realization of non-invasive directional coupler for Cellflex cables is presented. The new idea of the coupler is presented in which the coupled line is separated by half-wavelength long connecting lines and signal from the main line is picked up at two points only. The designed parameters are compared with measurements showing good agreement.
The idea, design and realization of HTS bandpass filters for ISM band is presented. The YBCO deposited on sapphire substrate has been used. The filter consists of stepped impedance planar resonators forming a lattice structure. Such a structure is suitable for filters with small size and narrow to intermediate bandwidths. The filters have been designed by combined optimization in Microwave Office...
Coupled resonators and coupled transmission lines are described with the same universal curve. Resonant frequencies of coupled resonators and impedances of coupled transmission lines reveal the same dependance on coupling coefficient. This can be used to select, adjust or create the models of coupled structures.
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