Resonant Length Calculation and Radiation Pattern Synthesis of Longitudinal Slot Antenna in Rectangular Waveguide

Mondal, Moutusi; Chakraborty, Ajay

doi:10.2528/pierl08042204

Cited by 23 publications

(20 citation statements)

References 9 publications

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“…lower than theoretically expected. It is primarily due to the radiation loss that affects the characterizing of the loss factor of the quarterwavelength open stub resonator [12][13][14][15][16][17][18]. As shown in Figure 5, a parallel-plane structure is placed in a 9 m × 6 m × 6 m Semi-Anechoic Chamber for measuring its overall maximum radiation field.…”

Section: Resultsmentioning

confidence: 99%

Measurement of Rf PCB Dielectric Properties and Losses

Chou¹,

Jeng²,

Lee³

et al. 2008

PIER Letters

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Abstract-This paper presents the calculations of transmission line loss factor by extracting from the Q-factor measurement of the quarterwavelength open stub resonators over the designed frequency and other resonant frequencies. A comparison of the loss factor of the design frequency with other resonant frequencies of each of the stub's quarter-wave resonances is provided in this paper. The radiation and discontinuity losses are undesirably included in the unloaded Q-factor measurement and it shows that the unloaded Q-factor is not repeatable at different designed frequency. The implementation of the loss factor measurement by quarter-wavelength open stub resonators is becoming more and more important to be considered with the increase of using the electronic circuits operating at high frequencies. † This author is also with

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Section: Resultsmentioning

confidence: 99%

Measurement of Rf PCB Dielectric Properties and Losses

Chou¹,

Jeng²,

Lee³

et al. 2008

PIER Letters

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show abstract

“…Therefore, a tapered section of one waveguide wavelength (λ g ) is placed in between the standard X-band section and the thin gap section. The taper should be designed to keep radiation reflection loss at a minimum, since the power may be lost to reflection and radiation [13][14][15][16]. Simulation using Vector Fields CONCERTO shows that the return loss of EM wave is minimized when the taper length is designed to be equal to 1* waveguide wavelength.…”

Section: Pfem System Arrangementmentioning

confidence: 99%

“…This is to produce a standing EM wave condition in the cavity. The TE 10 mode EM wave is generated from an X-band source and travels into the cavity via the opening on standard X-band section [13][14][15][16]. A taper section is designed to connect the standard X-band section and the thin gap section.…”

Section: Pfem Design Conceptmentioning

confidence: 99%

The Engineering and Construction of a Pre-Bunched Free Electron Maser

Malek

Lucas²,

Huang³

2009

PIER

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Abstract-We are developing prototype free electron maser (FEM) that is compact, tuneable and efficient for potential industrial use. Therefore we define the characteristics for the construction of a novel X-band rectangular waveguide pre-bunched free electron maser (PFEM). Our device operates at 10 GHz and employs two rectangular waveguide cavities (one for velocity modulation and the other for energy extraction). The electron beam used in this experiment is produced by thermionic electron gun which can operate at 3 kV and up to 5 mA. The resonant cavity consists of a thin gap section of height 1.5 mm which reduces the beam energy required for beam wave interaction. The prototype design, engineering and construction process are reported in this paper.

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“…In order for the electrons to interact with the TE 10 mode direction of the EM wave, the wiggler is used. In other words, the electron beam line is now intersecting the EM wave curve in the dispersion diagram, by using the correct wiggler parameters [8]. In the low power PFEM system, the path of the electrons is not in the same direction as the path of the injected EM wave.…”

Section: Introductionmentioning

confidence: 99%

The Experimental Results of a Low Power X-Band Free Electron Maser by Electron Pre-Bunching

Malek¹,

Lucas²,

Huang³

2010

PIER

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Abstract-We have developed a proof-of-concept low power free electron maser that is compact and low cost. The design, set-up and results of a novel (without wiggler) low power X-band rectangular waveguide pre-bunched free electron maser (PFEM) are presented in this paper. Our device operates at 10 GHz, with 10 mWatt seeding input power and employs two rectangular waveguide cavities (one for velocity modulation and the other for energy extraction). The electron beam used in this experiment is produced by Thoria coated Iridium filament which can operate at 3 kV and up to 5 mA beam current. The effect of the aperture on the power leaking out of the waveguide is also analyzed. The TE 10 mode propagation of the EM standing wave is used to pre-bunch the electron beams in the input cavity. The bunched electron beams are in the same phase as the TE 10 mode propagation of the EM wave in the output cavity. This free electron maser could be useful industrially, as it could be used with the commercially available accelerating voltage supplies.

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Resonant Length Calculation and Radiation Pattern Synthesis of Longitudinal Slot Antenna in Rectangular Waveguide

Cited by 23 publications

References 9 publications

Measurement of Rf PCB Dielectric Properties and Losses

Measurement of Rf PCB Dielectric Properties and Losses

The Engineering and Construction of a Pre-Bunched Free Electron Maser

The Experimental Results of a Low Power X-Band Free Electron Maser by Electron Pre-Bunching

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