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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...
A novel planar tunable bandpass filter using the centrally-loaded short-ended resonator is presented in this paper. Characterized by theoretical analysis, the proposed structure is founded to have the advantage that the fundamental frequency can be tuned while the second harmonic remains almost unchanged. By controlling the voltage, the lower passband can be tuned in a wide frequency range. To demonstrate...
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...
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