Analysis and design of a circular TE01 mode transducer

Saad, S.S.; Davies, J.B.; Davies, Owen J.

doi:10.1049/ij-moa.1977.0003

Cited by 40 publications

(15 citation statements)

References 3 publications

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“…As a result of the lack of computer-aided design (CAD) tools to perform the electromagnetic analysis, 15 this type of converters was designed heuristically until recent time. Some suitable referenced examples are the Southworth-type converter, 15,21 the Marie-type converter, 22,23 and the sector converter. 24 The main drawbacks of this kind of in-line configuration are the great length of the final device and the high level of the excited undesired modes.…”

Section: A Foundation Of the Mode Transducer Operationmentioning

confidence: 99%

High-performance 16-way Ku-band radial power combiner based on the TE01-circular waveguide mode

Montejo‐Garai

Saracho-Pantoja

Ruiz‐Cruz

et al. 2018

Review of Scientific Instruments

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This work presents a 16-way Ku-band radial power combiner for high power and high frequency applications, using the very low loss TE circular waveguide mode. The accomplished design shows an excellent performance: the experimental prototype has a return loss better than 30 dB, with a balance for the amplitudes of (±0.15 dB) and (±2.5°) for the phases, in a 16.7% fractional bandwidth (2 GHz centered at 12 GHz). For obtaining these outstanding specifications, required, for instance, in high-frequency amplification or on plasma systems, a rigorous step-by-step procedure is presented. First, a high-purity mode transducer has been designed, from the TE mode in the rectangular waveguide to the TE mode in the circular waveguide, with very high attenuation (>50 dB) for the other propagating and evanescent modes in the circular waveguide. This transducer has been manufactured and measured in a back-to-back configuration, validating the design process. Second, an E-plane 16-way radial power divider has been designed, where the power is coupled from the 16 non-reduced-height radial standard waveguides into the TE circular waveguide mode, improving the insertion loss response and removing the usual tapered transformers of previous designs limiting the power handling. Finally, both the transducer and the divider have been assembled to make the final radial combiner. The prototype has been carefully manufactured, showing very good agreement between the measurements and the full-wave simulations.

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Section: A Foundation Of the Mode Transducer Operationmentioning

confidence: 99%

High-performance 16-way Ku-band radial power combiner based on the TE01-circular waveguide mode

Montejo‐Garai

Saracho-Pantoja

Ruiz‐Cruz

et al. 2018

Review of Scientific Instruments

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“…Attenuation due to ohmic losses as an additional parameter has to be included while calculating a 1 and b 1 . The attenuation loss at the output port that can be given as:

α_{2} italicindB = 10 \log α_{1} + 10 \log ((), \frac{b_{1}}{b_{2}} ([], 2 - {(\frac{λ}{2 b_{1}})}^{2}) + {(\frac{λ}{2 b_{1}})}^{2}) - 10 \log ((), \frac{b_{1}}{a_{1}} + 2 {[\frac{λ}{2 b_{1}}]}^{2})

where, α 1 and α 2 are the attenuation coefficient of the □ TE 10 and □ TE 20 modes respectively . It shows that to limit the attenuation at the output port a 1 , b 1 , and b 2 have to be optimized.…”

Section: Principle and Designmentioning

confidence: 99%

Millimeter wave ^□ TE ₁₀ to ^○ TE ₀₁ mode transducer for electron cyclotron resonance heating applications

Bhatt

Patel

2019

Int J RF Microw Comput Aided Eng

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In this manuscript, a new design approach is proposed for □TE10 (rectangular) to ○TE01 (circular) mode transducer for electron cyclotron resonance heating (ECRH) applications. The design consists of two parts: first part has a rectangular waveguide, which transforms □TE10 to □TE20 mode, and in the second part, conversion of □TE20 into ○TE01 mode takes place. The electric field pattern, mode conversion efficiency or transmission efficiency and the operating principle of the individual parts are discussed, optimized, and analyzed. The novelty of this integrated design lies in the fact that it has merits of sidewall and inline coupling. Simulation study and optimization of the individual sections of the proposed mode converter were carried out using computer simulation technology (CST) microwave studio software (MWS). The simulation result shows that the design gives more than 97% of mode conversion efficiency with −1 dB bandwidth of 14.65% at 42 GHz. Copper material is used for fabrication of the mode transducers and are assembled with precise doweling. The simulated and measured high frequency (HF)‐field pattern of the proposed mode transducer is also highlighted in the manuscript.

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“…This conversion is usually very long and involves many sections cascaded in-line following a symmetric pattern in order to prevent the generation of higher-order modes, which may degrade the overall performance [11]. Some examples are the Southworth-type converter [18,24], the Marie-type [25,26], and the sector converter [27]. At the beginning of these developments, the design of this type of converters was based on the expertise of the designers; nowadays, powerful tools for computer aided design (CAD) are also combined with the know-how of the designers.…”

Section: Design Of the Circular Waveguide Te 01 Mode Transducer 21 Fmentioning

confidence: 99%

Design of Radial Power Combiners Based on TE 01 Circular Waveguide Mode

Montejo‐Garai¹,

Ruiz‐Cruz²,

Rebollar³

2019

Electromagnetic Fields and Waves

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Modern microwave and millimeter-wave systems require high-power amplifiers in very diverse fields such as communications or plasma physics. Although amplification technology has significantly evolved in the last decades, a single module is not enough for achieving the required power level. The solution in this case is the combination of several individual modules with power combiners. In this chapter, this concept is shown with two E-plane radial power combiners, both carrying a high-power signal with the circular waveguide TE 01 mode. The first design is a 16-way Ku-band combiner with an excellent experimental performance: return loss better than 30 dB, with a balance for the amplitudes of ±0.15 dB and ±2.5 o for the phases, in a 16.7% fractional bandwidth (2 GHz centered at 12 GHz), and efficiency better than 95% in this band. The second design is a 5-way W-band combiner, showing excellent characteristics as well: the experimental prototype has a return loss better than 20 dB, with a balance for the amplitudes of ±0.4 dB and ±3.5 o for the phases, in a 12.8% fractional bandwidth (12 GHz centered at 94 GHz), and efficiency better than 85% in this whole band. The experimental results obtained in both designs are the state of the art in the area of radial power combiners.

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Analysis and design of a circular TE01 mode transducer

Cited by 40 publications

References 3 publications

High-performance 16-way Ku-band radial power combiner based on the TE01-circular waveguide mode

High-performance 16-way Ku-band radial power combiner based on the TE01-circular waveguide mode

Millimeter wave ^□ TE ₁₀ to ^○ TE ₀₁ mode transducer for electron cyclotron resonance heating applications

Design of Radial Power Combiners Based on TE 01 Circular Waveguide Mode

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Analysis and design of a circular TE01 mode transducer

Cited by 40 publications

References 3 publications

High-performance 16-way Ku-band radial power combiner based on the TE01-circular waveguide mode

High-performance 16-way Ku-band radial power combiner based on the TE01-circular waveguide mode

Millimeter wave □ TE 10 to ○ TE 01 mode transducer for electron cyclotron resonance heating applications

Design of Radial Power Combiners Based on TE 01 Circular Waveguide Mode

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Product

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Millimeter wave ^□ TE ₁₀ to ^○ TE ₀₁ mode transducer for electron cyclotron resonance heating applications