Proof of Principle Experiments on Direct Generation of the $\hbox{TE}_{11}$ Mode in a Coaxial Vircator

Moller, Cecilia; Elfsberg, Mattias; Hurtig, Tomas; Larsson, Anders; Nyholm, S.E.

doi:10.1109/tps.2009.2035502

Cited by 16 publications

(6 citation statements)

References 9 publications

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“…The TM 01 mode pattern is not optimal when energy is to be focused using a classic horn antenna because the maximum of the far-field is not on the axis of the aperture. For this reason, the TE 11 mode is preferred [34]. Before the innovative solution to use an elliptic DT (EDT) that we will show later, a coaxial vircator can be designed to enhance the TE 11 mode using an SE [18], [34], [35], [36], [37], [38], as shown in Fig.…”

Section: Te 11 Optimization In Se Coaxial Vircatorsmentioning

confidence: 99%

“…For this reason, the TE 11 mode is preferred [34]. Before the innovative solution to use an elliptic DT (EDT) that we will show later, a coaxial vircator can be designed to enhance the TE 11 mode using an SE [18], [34], [35], [36], [37], [38], as shown in Fig. 8.…”

Section: Te 11 Optimization In Se Coaxial Vircatorsmentioning

confidence: 99%

“…A coaxial vircator in [34] and [35] optimized for the TE 11 mode has been studied. We reproduced and simulated this device on the 3-D PIC CST Studio Suite.…”

Section: Te 11 Optimization In Se Coaxial Vircatorsmentioning

confidence: 99%

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Innovative Mode Enhancement for High Power Coaxial Vircators

Valletti

Fantauzzi

Paolo

2023

IEEE Trans. Electron Devices

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The size and weight of a high power microwave (HPM) source can make a difference in strategic use. The compactness of the virtual cathode oscillator (vircator) is undoubtedly the most significant advantage of this device. Civil industry and agriculture can use it to treat objects, food, and soils for disinfestation and disinfection. Vircators could also generate electromagnetic pulses (EMPs) to force the arrest of vehicles and drones; EMPs could inhibit or activate improvised explosive devices (IEDs). The coaxial type vircator is a highly compact device. Due to its symmetric geometry, coaxial vircator is typically designed to work with a TM 01 mode. Still, when radiated into space, this mode gives maximum RF energy away from the antenna axis, a situation not desired. Instead, the TE 11 is convenient in applications involving precise antenna pointing since this mode gives a maximum RF energy precisely aligned to the antenna axis. By studying Mathieu functions applied to elliptical waveguides, we improve the performances of a TE 11 mode coaxial vircator using an elliptic drift tube (EDT). This is a completely innovative solution to reduce the mode competition inside the coaxial vircator. The rms and peak output power efficiency of the EDT coaxial vircator were measured on the TE 11 mode, obtaining the values of 6.1% and 10%, respectively, with a peak power of 450 MW in a highly compact device.

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Section: Te 11 Optimization In Se Coaxial Vircatorsmentioning

confidence: 99%

Section: Te 11 Optimization In Se Coaxial Vircatorsmentioning

confidence: 99%

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Innovative Mode Enhancement for High Power Coaxial Vircators

Valletti

Fantauzzi

Paolo

2023

IEEE Trans. Electron Devices

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“…FOI has designed and built several different vircators with an output power between a few megawatts up to hundreds of megawatts [15]- [18]. The vircator that is being modified for use in HPMtesting is a so called coaxial vircator that will generate a TE 11 mode in a cylindrical waveguide connected to a medium gain horn antenna [17]. Figure 6 shows a CAD-drawing of the vircator with waveguide output but without the horn antenna.…”

Section: Desrciption Of Hpm-generatormentioning

confidence: 99%

Methodology and equipment for destructive high-power microwave testing

Hurtig

Akyuz

Elfsberg

et al. 2014

2014 International Symposium on Electromagnetic Compatibility

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FOI is establishing a facility for destructive HPM testing and is developing an envisaged test methodology for such tests. The methodology consists of two test phases: (1) Determine the lowest power density required to destroy an object within a frequency range, using a reverberation chamber. (2) At this frequency, determine the most sensitive direction of attack using an HPM generator. A reverberating chamber and an HPMgenerator adequate for such tests are presented.

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“…A coaxial vircator is a modified version of the vircator to improve its low efficiencies [17]. Most coaxial vircators are designed to install the cathode outside the cylindrical anode and emit electrons in an inner radial direction [17][18][19][20][21][22][23][24][25][26][27][28]. The brief summarizations on the performances of other works are shown in Table 1.…”

Section: Introductionmentioning

confidence: 99%

Operation Features of a Coaxial Virtual Cathode Oscillator Emitting Electrons in the Outer Radial Direction

et al. 2021

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The operation features of the coaxial virtual cathode oscillator emitting electrons in the outer radial direction were investigated through simulations and experiments. A coaxial vircator was compared with an axial vircator when the anode to cathode distance of both vircators was 6 mm. The proposed coaxial vircator was operated when the anode to cathode distance was 5 mm, 6 mm, and 7 mm. The peak power and frequency of the microwave generated from the proposed coaxial vircator when the anode to cathode distance was 6 mm were 20.18 MW and 6.17 GHz, respectively. The simulations and experiments show that the proposed coaxial vircator generates 80% more microwave power than the axial vircator with the same anode to cathode distance. According to the simulations and experiments, the proposed coaxial vircator tends to generate a higher power average when the anode to cathode distance was larger than 5 mm. The frequency of the proposed coaxial vircator when the anode to cathode distance was 5 mm and 7 mm was approximately 8 GHz and 5 GHz, respectively. The geometric factor of the proposed coaxial vircator was considered to be the reason for the greater microwave power generation than the axial vircator. The frequency of the proposed coaxial vircator decreases inversely proportional with the anode to cathode distance as observed in the axial and basic coaxial vircators.

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Proof of Principle Experiments on Direct Generation of the $\hbox{TE}_{11}$ Mode in a Coaxial Vircator

Cited by 16 publications

References 9 publications

Innovative Mode Enhancement for High Power Coaxial Vircators

Innovative Mode Enhancement for High Power Coaxial Vircators

Methodology and equipment for destructive high-power microwave testing

Operation Features of a Coaxial Virtual Cathode Oscillator Emitting Electrons in the Outer Radial Direction

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