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This paper presents a frequency reconfigurable hybrid with broad tuning bandwidth. It consists of a broadband hybrid and an electric adjustment network. The electric adjustment network is utlized with varactor diodes. Analytical design equations are derived. The proposed hybrid was simulated. The analytical results agree well with the simulated ones. Simulation results show that by varying capacitance...
This paper presents a novel wideband quadrature hybrid with tunable power dividing ratio. It consists of a broadband hybrid power divider and two varactor diodes. By verifying the reverse voltage of the varactor diodes, the power dividing ratios between the two output ports (i.e., port 3 and port 4) of the hybrid can be easily controlled. Analytical design equations are derived using the even-odd...
This paper presents a frequency-agile bandpass filter with constant absolute bandwidth and high linearity. The proposed resonator is composed of an open-ended transmission line with back-to-back varactor diodes loaded at one end. A novel mixed electric and magnetic coupling scheme is proposed to contorll the coupling coefficients in order to keep the bandwidth constant when the frequency is tuned...
This paper presents the design of novel tunable bandpass filters with constant absolute bandwidth. A novel mixed electric and magnetic coupling scheme is utilized. Theoretical analysis indicates that it is able to achieve desired coupling coefficients between the proposed resonators at various frequencies so as to obtain constant absolute bandwidth. For demonstration, a frequency-tuning filter is...
In this paper, we proposed a novel system performance evaluation principle-utility representing user satisfaction to replace traditional ones like Bit Error Rate in coded cooperative wireless network. There are two types of services taken into account which are real time service and best effort service. A resource allocation scheme in coded cooperative wireless network are proposed in order to maximize...
This paper presents a high-selectivity planar triband bandpass filter. The proposed filter utilizes two different kinds of resonators, i.e., stub-loaded resonators and half-wavelength resonators. The stub-loaded resonator is used to generate the first and third passbands and the half-wavelength resonator yields the second passband. One set of resonators is inside the other and thus the overall circuit...
A minified UHF Tag antenna with two meander dipoles and a match network is proposed and simulated. The antenna is printed with thin copper on a polyimide substrate of 50 um thickness. The dimensions of the antenna are 65 mm in width and 48 mm in length. The simulation results show that the impedance bandwidth is 66 MHz and the radiation efficiency within the bandwidth is over 80%, and the antenna...
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