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HIC topology of proposed amplifier

High efficiency waveguide-planar amplifier with spatial power combining for frequency range 31-39 GHz

Mykhailo Yu. Omelianenko, T. V. Romanenko


The article presents the development results of the hybrid-integrated waveguide-planar amplifier circuit for 8-mm wave range with spatial power combining. Affordable and inexpensive low-noise UMS CHA2494-QEC integrated amplifiers are used in the developed circuit. To improve the efficiency of power combining, new longitudinal probe transition designs from a rectangular waveguide to a coplanar strip line (CSL), and to a microstrip line (MSL), whose dimensions do not exceed 0.4λ0, are proposed. As a result of the amplifier electromagnetic system development, a high efficiency of power combining has been achieved up to η ≈ 85%. The paper presents the experimental results of phase-shift keyed signals transmission through the developed amplifier with a signal level that is slightly lower than the level of 1 dB gain compression. On the basis of the proposed model, the amplifier degradation was also theoretically investigated for various failure modes of one of its active elements.


waveguide-planar amplifier; amplifier with spatial power combining; hybrid-integrated circuit; waveguide-planar circuit; longitudinal probe transition

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SECHI, F.; BUJATTI, M. Solid-State Microwave High-Power Amplifiers. Artech House, 2009.

DELISIO, M.P.; YORK, R.A. “Quasi-optical and spatial power combining,” IEEE Trans. Microwave Theory Tech., v.50, n.3, p.929, 2002. DOI:

JEONG, J.; KWON, Y.; LEE, S.; CHEON, C.; SOVERO, E.A. “1.6- and 3.3-W power-amplifier modules at 24 GHz using waveguide-based power-combining structures,” IEEE Trans. Microwave Theory Tech., v.48, n.12, p.2700, 2000. DOI:

CHOU, C.-F.; HSIAO, Y.-H.; WU, Y.-C.; LIN, Y.-H.; WU, C.-W.; WANG, H. “Design of a V-band 20-dBm wideband power amplifier using transformer-based radial power combining in 90-nm CMOS,” IEEE Trans. Microwave Theory Tech., v.64, n.12, p.4545, 2016. DOI:

MEIER, P.J. “Printed-circuit balanced mixer for the 4- and 5-mm bands,” IEEE MTT-S Int. Microwave Symp. Dig., 30 Apr.-2 May 1979, Orlando, USA. IEEE, 1979, p.84-86. DOI:

KANEDA, N.; QIAN, Y.; ITOH, T. “A broad-band microstrip-to-waveguide transition using quasi-Yagi antenna,” IEEE Trans. Microwave Theory Tech., v.47, n.12, p.2562, 1999. DOI:

RELJIĆ, Boro M. “Novel MIC/MMIC compatible microstrip to waveguide transition for X band without a balun,” Mikrotalasna Revija, June, p.16, 2007.

CHUANG, J.-K.; FANG, R.-Y.; WANG, C.-L. “Compact and broadband microstrip-to-waveguide transition using antisymmetric tapered probes,” Electron. Lett., v.48, n.6, p.332, 2012. DOI:

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