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A compact tri-band bandpass filter (BPF) designed using the stub-loaded stepped-impedance resonator (SL-SIR) is presented in this paper. The characteristics of the SIR are firstly studied by using the even-/ odd-mode analysis method. In order to reduce the overall size, a stepped-impedance meander loop resonator is used to design the tri-band BPF. By optimizing the structural parameters, a tri-band...
This paper describes a fan-shaped metal-loaded helix slow-wave structure (SWS) to develop ultra-wideband traveling-wave tube with low gain fluctuation. The electromagnetic characteristics and beam-wave interaction of this structure are calculated. The simulation results show that the helix TWT gain is more than 42dB and the signal gain fluctuation of the TWT is less than 2.5dB in a frequency range...
We present a novel double V-shaped winding microstrip meander-line slow-wave structure (SWS) for traveling-wave tubes (TWTs) in this paper. The proposed structure evolves from a V-shaped winding microstrip meander-line. The radio-frequency characteristics of the above-mentioned structures are calculated. Numerical results from high frequency characteristics calculation are given and analyzed. It has...
A 2-dimensional (2-D) ring-bar microstrip meander-line for broad band miniaturization planar traveling-wave tubes (TWTs) has been proposed in this paper. Simulated by 3-D high frequency software, the cold band width of this 2-D ring-bar microstrip meander-line slow wave structure (SWS) is almost double that of the traditional U-shaped microstrip meander-line SWS at the same dimensions, which means...
A novel and simple helix slow-wave structure (SWS) with low gain fluctuation is present. The high frequency characteristics and beam-wave interaction of this structure are calculated. The simulation results show that the gain of the novel helix traveling wave tube (TWT) is more than 58dB at Ka-band. At the same time, the gain fluctuation of the TWT is less than 6.2dB.
A new approach for low gain fluctuation based on small-signal gain analysis of wide-band traveling wave tubes (TWTs) is proposed in this paper. For the known simulated dispersion characteristics of slow wave structure (SWS), the relation between interaction impedance and frequency is obtained by setting zero to the first derivative of gain with respect to frequency. We can confirm whether a SWS reaches...
Spread spectrum time domain reflectometry (SSTDR) has been applied to a live PV inverter circuit to measure impedance variations caused by natural degradation in switching devices (MOSFET), and this method was applied without altering the normal operation of the circuit. Therefore, the proposed technique is able to perform condition monitoring - the state of health of the inverter. The experimental...
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