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A new type of variable phase shifter is designed by using the Ansoft HFSS simulation software, which is based on the suspended T-junction and its equivalent circuit. It can easily realize the characteristic of equal power and phase shift.
An improved microstrip open-loop bandpass filter with controllable electric and magnetic mixed coupling is proposed. An additional transmission zero can be produced and precisely controlled by tuning electric and magnetic coupling parameters respectively. An equivalent circuit is used to analyze the behavior of the proposed filter. Simulated and measured results are in good agreement.
An improved group delay method for the tuning of microwave filters is introduced. This method is based on the group-delay values of reflection coefficients. Measuring the group delay of reflection coefficients synthesizes all the couplings and resonant frequencies. This method requires successive trials to achieve synchronous tuning of n/2 (n=the degree of the filter, if n is odd, the tuned number...
Soil respiration is a main dynamic process of carbon cycle in wetland. It is important to contribute to global climate changes. Water table and nutritious availability are significant impact factors to influence responses of CO2 emission from wetland soil to climate changes. Twenty-four wetland soil monoliths at 4 water-table positions and in 3 nitrogen status have been incubated to measure rates...
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