Effect on rectangular waveguide resonant cavity of temperature is discussed. A new temperature compensation method is proposed. Bimetal is used to adjust resonant frequency. An instrument is produced under the instruc...
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Effect on rectangular waveguide resonant cavity of temperature is discussed. A new temperature compensation method is proposed. Bimetal is used to adjust resonant frequency. An instrument is produced under the instruction of this method and the function has been validated.
This paper reports and demonstrates for the first time a surface mountable horn antenna and also a transition from substrate integrated waveguide (SIW) to standard rectangular waveguide for microwave and millimeter-wa...
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This paper reports and demonstrates for the first time a surface mountable horn antenna and also a transition from substrate integrated waveguide (SIW) to standard rectangular waveguide for microwave and millimeter-wave system applications. The proposed horn antenna and the transition can be installed or surface-mounted on top of the metal housing of a planar SIW circuitry as easy as a "cap". The transition is designed as a waveguide quarter-wave stepped impedance transformer. Simulation and measurement results over K-band are given in this paper.
For the purpose of realizing compact plane-wave antenna measurements, a planar array antenna made of 45 rectangular waveguides is fabricated for small antenna pattern measurements. The center frequency designed for th...
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For the purpose of realizing compact plane-wave antenna measurements, a planar array antenna made of 45 rectangular waveguides is fabricated for small antenna pattern measurements. The center frequency designed for the antenna is 12 GHz. As a result of the horn antenna pattern measurement, fairly good agreement between the outdoor data and that in the fabricated situation is obtained. This newly constructed array antenna is expected to offer low-cost weather-independent antenna measurements.< >
The design of a 340GHz two-beam folded waveguide (FW) traveling-wave amplifier with >4 W of power over with the input power of 20mW is presented. The amplifier is driven by two electron guns (70mA×2, 14.9kV) a...
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ISBN:
(纸本)9781479938780
The design of a 340GHz two-beam folded waveguide (FW) traveling-wave amplifier with >4 W of power over with the input power of 20mW is presented. The amplifier is driven by two electron guns (70mA×2, 14.9kV) and 1T magnetic field. The design is performed by CST Particle Studio. Particle-in-cell (PIC) simulations were carried out to predict and optimize the performance of the folded waveguide TWT.
This paper presents the evaluation of dielectric tapered horn antennas that are fed by planar radio frequency (RF) transmission line to dielectric filled waveguide transitions. The antennas are developed to be efficie...
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ISBN:
(纸本)9781509015146
This paper presents the evaluation of dielectric tapered horn antennas that are fed by planar radio frequency (RF) transmission line to dielectric filled waveguide transitions. The antennas are developed to be efficiently manufactured with the laser direct structuring (LDS) method that allows for a 3d metalization of plastic surfaces. In doing so the flexibility of the antenna design process is increased. Furthermore the antennas can be directly combined with a circuitry if required. First of all, a fundamental evaluation is done by means of two different transitions from typical RF transmission lines to a rectangular dielectric filled waveguide at 24 GHz. Based on these findings a test antenna is designed and subsequently manufactured with the LDS method. To evaluate the manufacturability with the LDS method in general and additionally prove the concept, the configuration of this test antenna is kept relatively simple. The prototype is characterized in an anechoic chamber and the results are discussed. In the next step an additional example design that is based on an typical dielectric antenna is discussed. To conclude, the results obtained are summarized and discussed with respect to a use for the development of RF applications.
An analysis of a two-section folded waveguide TWT for terahertz radiation is performed. The theory of high frequency characteristics including the dispersion properties and the beam-wave interaction impedance of this ...
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ISBN:
(纸本)9781424449637
An analysis of a two-section folded waveguide TWT for terahertz radiation is performed. The theory of high frequency characteristics including the dispersion properties and the beam-wave interaction impedance of this structure are analyzed for nonlinear interaction analysis. A THz-band folded waveguide TWT using 10.8kV, 50mA electron beam is designed and the nonlinear beam-wave interaction in the TWT is investigated by the use of MAGIC3D. The maximum radiation power of 34.7W corresponding to the saturated gain of 25.4dB is predicated at 140GHz.
This paper presents a theoretical study of electromagnetic waves propagating in a rectangular plasma waveguide. Plasma waveguide under consideration represents a rectangular metal waveguide partially filled with semic...
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This paper presents a theoretical study of electromagnetic waves propagating in a rectangular plasma waveguide. Plasma waveguide under consideration represents a rectangular metal waveguide partially filled with semiconductor. We also investigate interaction of a non-relativistic electron beam moving within the waveguide with the electromagnetic oscillations in it. Collisions of electrons are taken into account. An electrostatic approach is used for the investigation of the beam-plasma interaction. Such an approach significantly simplifies the task and allows one to receive dispersion equations in an analytical form.
This paper presents a three-dimensional radio wave propagation model that is suitable for 5G and beyond frequency bands in tunnels. The model is based on a split-step parabolic equation (SSPE) method, which can achiev...
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This paper presents a three-dimensional radio wave propagation model that is suitable for 5G and beyond frequency bands in tunnels. The model is based on a split-step parabolic equation (SSPE) method, which can achieve superior performance at high frequencies compared to the widely used finite-difference parabolic equation (FDPE) method. The accuracy and efficiency of SSPE-based models are demonstrated through comparisons with analytical solutions as well as FDPE-based models in rectangular waveguides. Numerical results are also validated against experimental measurements in a realistic tunnel geometry.
This paper presents the design of a 5-element array consisting of four complementary split ring (CSR) slots on the narrow-wall of a rectangular waveguide and an H-plane-bend (HPB) radiator. Subwavelength CSR slots are...
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This paper presents the design of a 5-element array consisting of four complementary split ring (CSR) slots on the narrow-wall of a rectangular waveguide and an H-plane-bend (HPB) radiator. Subwavelength CSR slots are recently proposed as elements of slotted waveguide antenna (SWA) arrays. Combining CSR slots on the narrow-wall of a rectangular waveguide with an HPB radiator provides significant size reduction while maintaining high-power handling ability. A periodic air-filled corrugation is applied to the post narrow-wall of the rectangular waveguide to achieve better return loss.
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