40-W CW broad-band spatial power combiner using dense finline arrays

Cheng, Nai-Shuo; Alexanian, A.; Case, Michael; Rensch, D.B.; York, R.A.

doi:10.1109/22.775438

Cited by 54 publications

(5 citation statements)

References 4 publications

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“…12. Measurements were completed for different pulse duty cycles Compared to other SSPAs using spatial power combining [21][22][23], the proposed approach offers the most compact design with low loss. At Ku-band (using WR62 waveguide, a × b = 15.8 × 7.8 mm 2 ), a limit of two HPAs along with the required capacitors can be placed inside the waveguide without suffering from instability.…”

Section: Implementation and Resultsmentioning

confidence: 99%

Low‐loss compact power combiner for solid state power amplifiers with high reliability

Gholami¹,

Amaya

Yagoub³

2016

IET Microwaves, Antennas & Propagation

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In this study, a low‐loss and compact planar power combiner for solid state power amplifiers (SSPAs) is proposed. It combines eight power amplifier modules with low insertion loss (IL) and high reliability by utilising a novel magic‐Tee configuration and E‐plane bend along with a suitable microstrip‐to‐waveguide transition. The fabricated prototype was implemented through automatic milling machines to produce three planar layers that form the final structure. This novel approach enabled precise fabrication, simple assembly of the SSPAs as well as low‐cost manufacturing in comparison with existing traditional approaches. This process is suitable for SSPAs operating from 4 to 40 GHz. The combined IL of the implemented combiner network is less than 0.6 dB at Ka‐band, 0.5 dB at Ku‐band, and 0.4 dB at X‐band while exhibiting a 10% fractional bandwidth.

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Section: Implementation and Resultsmentioning

confidence: 99%

Low‐loss compact power combiner for solid state power amplifiers with high reliability

Gholami¹,

Amaya

Yagoub³

2016

IET Microwaves, Antennas & Propagation

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“…Various power combination techniques have been proposed in the literature [32], [33], [34], [35], [36] which can be utilized to combine different QPSK signals in an RF-QAM transmitter. Among different methods, three main techniques are (1) transformer-based power combining as shown in Fig.…”

Section: Power Combiningmentioning

confidence: 99%

A Study of a Millimeter-Wave Transmitter Architecture Realizing QAM Directly in RF Domain

Oveisi

Wang

Heydari

2023

IEEE Trans. Circuits Syst. I

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Realization of high-order modulation schemes directly in the RF domain enables the generation of spectrally efficient 4 M quadrature-amplitude-modulated (4 M QAM) symbols using the vectorial summation of M quadrature phase-shift keying (QPSK) signals whose amplitudes are progressively scaled by a constant factor of two. Called RF-QAM, this approach leads to numerous advantages including the elimination of powerhungry digital-to-analog converter (DAC) and the mitigation of stringent linearity requirement of the front-end power amplifier (PA). This paper presents a comprehensive comparative study of RF-QAM and conventional transmitters. The design issues associated with the front end and the mixed-signal blocks for both architectures are investigated, and the performance of these two designs is compared. Various circuit-and system-level simulations verify the superior performance of the RF-QAM transmitter compared to the conventional counterpart.Index Terms-Digital-to-analog converter (DAC), power amplifier (PA), quadrature amplitude modulation (QAM), quadrature phase-shift keying (QPSK), radio frequency (RF), terahertz (THz), transmitter (TX), 6G. I. INTRODUCTIONT HE advent of emerging content-intensive applications has led to the ever-increasing demand for high-speed data transmission, and thus, the emergence of 6G and beyond where the operating frequency is designated to be in the terahertz (THz) range (loosely defined to cover frequencies from 100-to 1000-GHz) [1], [2]. Several transceiver front-ends operating at the low side of the THz band achieving impressive data rates have been reported in the literature [3], [4], [5], [6]. Recently, a number of end-to-end integrated transmitters and receivers operating above 100 GHz have been presentedAchieving high data rate by increasing the center frequency to obtain larger bandwidth (BW) comes with several essential concerns: (1) Operating above f max /2 results Manuscript

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“…Table 4 shows the performance comparison of this work with the previous tray-type spatial power combiners operating from X-to Ka-band. The power combiners in [9], [10] stacks several trays (from two to six) using slotline-to-microstrip transition inside X-band standard waveguide without size expansion. In [14] and [19], the K-and Ka-band waveguides were expanded using stepped and tapered waveguides, so that they could contain six and two trays, respectively.…”

Section: Fabrication and Measurementmentioning

confidence: 99%

“…Tray-type power combiners, where many trays with power devices are vertically stacked inside the rectangular waveguide, have been widely adopted for high-power generation in several frequency bands. In [9] and [10], several PA trays were spatially combined within Xband standard waveguide using a tapered slot antenna array. In both papers, bond-wires were used to convert the TE10 mode of the waveguide into the quasi-TEM mode of the microstrip.…”

Section: Introductionmentioning

confidence: 99%

Ka-Band Tray-Type Spatial Power Combiner Using H-Plane Expanded Waveguide With Side-Ridges

Park

Jeong

2023

IEEE Access

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A tray-type spatial power combiner is proposed at Ka-band using an H-plane expanded waveguide with side-ridges and a dipole transition array. In order to overcome the small size of the Ka-band standard waveguide and accommodate as many as trays (six trays in this work), the H-plane of the waveguide is expanded by three times using two-stepped waveguide transition. A circular post is employed to effectively suppress higher-order modes in the expanded waveguide. In addition, a side-ridged waveguide is proposed to reduce non-uniformity in the field and power distribution along the expanded H-plane which seriously degrades power combining efficiency. It boosts the electric field close to the waveguide sidewalls by adding the metallic ridges which reduces the waveguide height at the sides. It is shown from the simulation that the proposed side-ridged waveguide can evenly distribute the electromagnetic power and reduce the magnitude imbalances between the trays. In addition, a capacitive iris is introduced in the ridges to improve the phase balance as well. The H-plane expanded waveguide with side-ridges was fabricated and the measurement showed an insertion loss as low as 0.2 dB at Ka-band. Then, six trays consisting of dipole transition and microstrip line on the dielectric substrate was accommodated between the H-plane expanded waveguides with side-ridges. The overall power combining system exhibited the measured insertion loss of 1.2 dB (backto-back loss) at Ka-band. This result belongs to the excellent performance in terms of insertion loss and the number of the trays among the tray-type spatial power combiners reported at Ka-band.INDEX TERMS Expanded waveguide, millimeter-wave, spatial power combiner, waveguide transitions.

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40-W CW broad-band spatial power combiner using dense finline arrays

Cited by 54 publications

References 4 publications

Low‐loss compact power combiner for solid state power amplifiers with high reliability

Low‐loss compact power combiner for solid state power amplifiers with high reliability

A Study of a Millimeter-Wave Transmitter Architecture Realizing QAM Directly in RF Domain

Ka-Band Tray-Type Spatial Power Combiner Using H-Plane Expanded Waveguide With Side-Ridges

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