A High-Efficiency W-Band Power Combiner Based on the TM₀₁ Mode in a Circular Waveguide

Dang, Zhang; Zhu, Haifan; Huang, Jian; Zhu, Huali; Zhang, Yong

doi:10.1109/tmtt.2021.3135410

Cited by 12 publications

(9 citation statements)

References 28 publications

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“…Then, the frontside patch-shaped probe without the backside metal pattern emits the EM fields into the circular waveguide, producing the TM 01 mode with circulating magnetic fields at C-C'. In the proposed mode transducer, the rectangular and circular waveguides are aligned along the wave propagation, unlike the traditional mode transducers in [9], [10], [11], [12], and [13]. The in-line structure is beneficial to achieve the compact and low-loss mode transducer because it does not require the long thru-waveguides, waveguide tee junctions, or waveguide bends.…”

Section: Design Of the Eight-way Radial Power Combinermentioning

confidence: 99%

“…5(b). The radius (r 1 ) of the cavity is determined by the number of the output ports and the cavity resonant modes [13]. The larger the radius, the larger the number of the rectangular waveguides can be accommodated.…”

Section: B Design Of the Eight-way Radial Junctionmentioning

confidence: 99%

“…Output power available from an individual solid-state power amplifier is very limited, especially at high frequencies, so that multi-way power combining is essential to achieve a high output power [1], [2]. Rectangular waveguide-based radial power combiners are widely used at millimeter-wave frequencies to produce high output powers by combining power amplifier modules [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13]. They utilize the radial symmetry of the cylindrical cavity with a coupling structure of circular waveguide at the center of the cavity.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the EM fields can be equally divided into the rectangular waveguides which are placed along the circumference of the cavity with an equal distance. In order to maintain the radial symmetry of this junction, the circular waveguide with TE 01 or TM 01 modes is commonly used as a feeding structure [8], [9], [10], [11], [12], [13]. Therefore, there is a need for a mode transducer which converts EM modes between TE 01 or TM 01 mode of circular and TE 10 mode of the rectangular waveguide.…”

Section: Introductionmentioning

confidence: 99%

“…The TM 01 mode-based radial power combiners have been proposed in [12] and [13], because the TM 01 mode also preserves the circular symmetry in the EM fields, where all the output rectangular waveguides are placed along the circumference of the cylindrical cavity such that H -planes are aligned in the same plane. They also consist of the waveguide H -plane tee junctions, steps, and 90 • bends, similar to the TE 01 mode transducers.…”

Section: Introductionmentioning

confidence: 99%

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A Broadband Radial Power Combiner Using a Dipole Antenna-Based TM Mode Transducer

2022

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A TM 01 mode transducer based on dipole antenna is proposed to design a broadband and low-loss radial power combiner at . It is an essential component in the radial power combiners to convert the electromagnetic modes between rectangular and circular waveguides. The latter feeds the cylindrical cavity in TM 01 mode of which the fields exhibit a circular symmetry. The proposed TM 01 mode transducer consists of the dipole antenna, microstrip, and probe on a dielectric substrate. It is an in-line mode transducer. In other words, the rectangular and circular waveguides are aligned along the same axis of wave propagation. Therefore, it does not require the waveguide components such as tee junctions, steps, and bends which are normally used in the traditional mode transducers and increase the complexity, size, and loss of entire power combiner. The eight-way radial junction is also designed using a cylindrical cavity, where the rectangular waveguides are placed along the circumference of the cylindrical cavity. The dimensions of each component are determined based on the full-wave electromagnetic simulations. The designed eight-way radial power combiner consisting of the TM 01 mode transducer and radial junction is fabricated in four-split blocks by mechanical machining. In the measurements, the proposed power combiner exhibits a broadband and low-loss performance under a compact size while maintaining the magnitude and phase balances between the eight ports.INDEX TERMS Ka-band, millimeter waveguide power combiner/divider, mode-conversion, radial junction, TM 01 mode transducer.

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Section: Design Of the Eight-way Radial Power Combinermentioning

confidence: 99%

Section: B Design Of the Eight-way Radial Junctionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Broadband Radial Power Combiner Using a Dipole Antenna-Based TM Mode Transducer

2022

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A Terahertz GaN solid‐state power amplifier on radial combining technique

Cheng,

Zhu,

et al. 2024

Micro & Optical Tech Letters

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Terahertz (THz) bands are considered to have various anticipated applications. Output power is an important factor determining the operating distance of THz systems, but it is very challenging to achieve high output power under current solid‐state terahertz circuit technology. The paper first presents a four‐way G‐band radial combiner, which features high passive efficiency of 88% and compact size. Moreover, based on this radial combiner and in‐house fabricated gallium nitride chips, a solid‐state power amplifier prototype is further demonstrated. Measured results show that, the average saturated output power is 21.7 dBm across the 180–240 GHz band with a typical output power of 23.2 dBm at 189 GHz.

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3D-printed x-band 1-port TM01 circular waveguide to 4-port TE10 rectangular waveguide mode converter & power splitter

Chia,

2024

Electromagnetics

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A High-Efficiency W-Band Power Combiner Based on the TM₀₁ Mode in a Circular Waveguide

Cited by 12 publications

References 28 publications

A Broadband Radial Power Combiner Using a Dipole Antenna-Based TM Mode Transducer

A Broadband Radial Power Combiner Using a Dipole Antenna-Based TM Mode Transducer

A Terahertz GaN solid‐state power amplifier on radial combining technique

3D-printed x-band 1-port TM01 circular waveguide to 4-port TE10 rectangular waveguide mode converter & power splitter

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