Wenquan Che

Millimeter-wave ferrite phase shifter in substrate integrated waveguide (SIW)

The analytical model of the ferrite phase shifter in SIW and formulae are firstly introduced. On the basis of theoretical simulation, the optimum parameters of the phase shifter have been given. Furthermore, the design of transition from ferrite phase shifter in substrate-integrated waveguide (SIW) has been investigated, and the simulation results have shown the good performance of this integrated structure.

Cutoff characteristics of modes in a circular waveguide filled with microwave ferrite

This development starts from the deduction of the cutoff characteristics equations of the modes in the circular waveguide filled with microwave ferrite. Corresponding to different values of μr, the cutoff frequencies for several modes are calculated, the theoretical results of dominate mode and TM01 mode are proved to agree well with the experimental verification. The effects of μr on the cutoff characteristics of the device are also discussed. On the basis of depressing the TM modes, it is possible to develop the innovative low-loss millimeter wave transmission lines. On the other hand, when μr < 0.0, TM01 mode is converted into the lowest order mode in a circular waveguide, because of the symmetrical field distribution, its future application will be unmatched attractive.

Improved analysis of nonreciprocal remanence ferrite phase shifter in grooved waveguide

In this paper, the nodal finite-element method is used to analyze the differential phase shift of a nonreciprocal remanence ferrite phase shifter in a grooved waveguide. Instead of the former twin-slab model, an improved analytical model is adopted, where the effect of every part of a ferrite toroid on the differential phase shift has been considered. This analysis may replace the correcting factor with good agreement with the experimental data. Furthermore, this analysis is employed to investigate the effect of corner chamfering on the figure-of-merit (differential phase shift per decibel insertion loss) of a ferrite phase shifter. The numerical results are found to agree with the experiments in the literatures.

Millimeter-wave substrate integrated waveguide ferrite phase shifter for wireless communication application

The design idea and technique of the substrate integrated waveguide (SIW) ferrite phase shifter has been investigated. Firstly, on the basis of theoretical simulation, the optimum parameters of the phase shifter have been given. And then, the design procedure of transition from ferrite phase shifter in SIW to CPW has been introduced; and the agreement between the simulation results of the final integrated structure and the experimental results of the equivalent model has shown the good performance of this integrated structure.

Effect of waveguide tolerance on characteristics of the latching ferrite phase shifter in a rectangular waveguide

In this paper, the effects of waveguide height tolerance on characteristics of the ferrite phase shifter in a rectangular waveguide have been investigated. It has been indicated that larger height tolerance usually results in bigger insertion loss. In addition, the emphasis has also been focused on the theoretical analysis and experimental verification of the effects on insertion phase of ferrite phase shifter, caused by the height tolerance. Two kinds of models have been employed to analyze the effects with finite element method (FEM), and the results have been compared with measured data, respectively. The practical model has been proved to provide more accurate results and agree better with experiments, the results shown that the height tolerance has great effect on the insertion loss.

Rigorous analysis of the temperature characteristics for ferrite phase shifter in grooved waveguide

A rigorous analysis for the temperature characteristics of a ferrite phase shifter in a grooved waveguide is investigated by using a combination of analytical and numerical methods. Qualitative descriptions of the solid state temperature rise of the ferrite phase shifter in a grooved waveguide are also presented, corresponding to different insertion loss and ridge height. The results obtained provide a valuable guidance to simulate the property of the device in the high power case and can help to optimize the design of the devices.

Research on double-channel variable polarization system with short switching time

A double-channel variable polarization system with very short switching time is studied, and the emphasis is focused on the analysis of polarization for the electromagnetic waves, corresponding to transmitting and receiving states, respectively. Moreover, the characteristic parameters of a practical latching ferrite phase shifter in S-band are presented it is found that the device has a high power capacity, low insertion loss, short switching time. These features are extremely useful for building a radar target recognition system and for extraction of polarization information.