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In this paper, a low cost and compact K-band radar front-end, which can output FMCW signals in 23.76∼24GHz with phase noise about −80dBc/Hz@10KHz and spurious suppression higher than 60dBc is designed. The frequency source part achieves the purposes of low power consumption and miniaturization with 2.8W DC power consumption and 58×53×19mm3 dimension. The results of close loop experiments (3m, 4m,...
A differential power divider based on the Defected Ground Structure (DGS) operating at S-Band is developed. A novel DGS structure is proposed and its performance in the power divider is analyzed using a 3D full-wave simulator. The DGS structure can eminently realize miniaturization by comparing the operating frequency with the one without DGS and the one using conventional DGS. The return loss of...
A full-wave bridge rectifier with high conversion efficiency and high input range is proposed. A power dividing network is used to handle the low reverse breakdown voltage of Schottky diodes to achieve high input power. The defected ground structure is used to increase the coupling coefficient of the power-dividing network. The power-dividing network couple the input RF power into four differential-type...
Isatin, an endogenous compound existent in many organisms, shows a wide range of biological activities. In this paper, we like to report the design and synthesis of several isatin derivatives through the acetalization, N-Alkylation, Microwave-asistant Heck coupling reaction and so on. Among those compounds, (E)-1-(4-chlorobenzyl)-5-styryl-indoline-2-carbonyl-3, 3-(ethylenedioxy) dione and (E)-1-(4-chlorob-enzyl)-5-styrylindoline-2,...
The design of a compact microwave diplexer is presented. Folded structures with coupled cavities are used to minimize its size. The sample diplexer is fabricated and the tested results show good agreement with the design target.
A compact filter with coupled shorting stubs is proposed, which also has excellent out-of-band elimination. The structure can produce transmission zeros at both sides of the pass-band of a broadband or a narrow band filter. The configuration parameters and simulated results are presented. Tested results from a sample filter show that the insertion loss is lower than 0.4 dB in the pass-band from 7...
A compact FSS (frequency selective surface) filter will be designed in this paper. The length of the filter is reduced by the use of both bandpass and bandstop FSSs. A sample filter at 8.05 GHz will be designed using CST Studio as an example. Simulation results show that the FSS filter has a bandwidth of 800 MHz and a reflection lower than -20 dB. Tested results from this sample filter agree well...
This paper presents a band-stop filters with far spurious stop bands. At first, a coaxial cavity with far spurious stop band is proposed. Then several such coaxial cavities are connected in series to form a band-stop filter. To illustrate the design process, a coaxial band-stop filter has been designed, with a stop-band centered at 5 GHz, a bandwidth of 2 GHz, and its first spurious stop-band higher...
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