Broadband 100-W <i>Ka</i>-Band SSPA Based on GaN Power Amplifiers

Neininger, Philipp; John, Laurenz; Zink, M.; Meder, Dirk; Kuri, M.; Tessmann, A.; Friesicke, Christian; Mikulla, M.; Quay, R.; Zwick, Thomas

doi:10.1109/lmwc.2022.3166563

Cited by 12 publications

(5 citation statements)

References 12 publications

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“…If amplifiers with severely differing insertion phase would be used, load-pulling phenomena could occur, which could deteriorate the power or efficiency of the amplifiers [34]. However, in our own experiments with amplifiers that feature an insertion phase spread of up to ±25 • , no significant deterioration could be observed [35]. A comparison of the measured and simulated sum-port reflection coefficients can be seen in Fig.…”

Section: Measurements and Analysismentioning

confidence: 87%

16-Way Ka-Band Power Combiner Using Novel Waveguide Transitions

Neininger

Zink

John

et al. 2022

IEEE Trans. Microwave Theory Techn.

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In this article, we present the design, manufacturing, and experimental validation of a Ka-band wide-bandwidth and low-loss 16-way combiner. We specifically focus on the analysis and demonstration of the combiner's suitability for operation at millimeter-wave (mmW) frequencies. To that end, we extend the established radial-combiner design procedure. As part of this, we propose an oversized feeder design that allows for exceptional insertion and return loss. Furthermore, for the first time, we introduce a peripheral transition from the radial line to rectangular waveguide with integrated matching network and suitable schematic models. We also explore the design space of the radial line itself by analyzing the properties of various height tapers and, as a result, introduce an optimized radial-line profile that minimizes its reflections. The demonstrator measurements indicate an insertion loss (IL) of less than 0.24 dB, a return loss of better than 17 dB, and a phase imbalance of less than 3 • in the entire Ka-band. To the best of the authors' knowledge, this is the lowest IL for a wideband multiway combiner and at the same time one of the most broadband combiner solutions realized in the Ka-band.

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Section: Measurements and Analysismentioning

confidence: 87%

16-Way Ka-Band Power Combiner Using Novel Waveguide Transitions

Neininger

Zink

John

et al. 2022

IEEE Trans. Microwave Theory Techn.

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“…Radial combining technology is widely known for its low-loss advantages. 8,9 Solid-state power amplifiers (SSPAs) using radial combiner and gallium nitride (GaN) devices within 100 GHz were reported in recent years, [10][11][12] but radial power combining in THz band have not yet emerged until now.…”

Section: Introductionmentioning

confidence: 99%

“…Under new achievements of G‐band power amplifier (PA) chip Using InP HBT process, several research on G‐band waveguide binary power combining have been released, 5–7 and a significant feature is demonstrated that the combining efficiency deteriorates obviously with the frequency up to THz band. Radial combining technology is widely known for its low‐loss advantages 8,9 . Solid‐state power amplifiers (SSPAs) using radial combiner and gallium nitride (GaN) devices within 100 GHz were reported in recent years, 10–12 but radial power combining in THz band have not yet emerged until now.…”

Section: Introductionmentioning

confidence: 99%

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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“…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].…”

Section: Introductionmentioning

confidence: 99%

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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Broadband 100-W Ka-Band SSPA Based on GaN Power Amplifiers

Cited by 12 publications

References 12 publications

16-Way Ka-Band Power Combiner Using Novel Waveguide Transitions

16-Way Ka-Band Power Combiner Using Novel Waveguide Transitions

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

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

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