Due to the disadvantages of vacuum tubes in terms of warm-up time, size, and highvoltage needs, solid-state power amplifiers (SSPAs) with gallium nitride (GaN) monolithic microwave integrated circuits (MMICs) are the key solution for power levels up to some kilowatts in continuous wave. An SSPA is the most convenient solution for these RF power levels due to its low weight, small size, negligible warm-up time, low-voltage operation, and high reliability. Spatial power amplifiers (SPAs) combining techniques are the best candidates for SSPAs due to the intrinsic low attenuation in dividing and combining functions. SPAs mainly use two types of probes: transverse and longitudinal, such as FinLines. This paper describes a broadband FinLine to microstrip (FLuS) transition based on dielectric lens theory. Comparative simulations with traditional FinLine transitions show a significant improvement in matching performances and a very significant increase in mechanical resistance of the transition. The proposed innovative FLuS uses a substrate shaping designed according to dielectric lens theory. Frequency simulations of a FLuS inside the WR22 waveguide are shown. These evidence the better performances of this transition than the classic FLuS transition using quarter-wave transformer (QWT) matching. A Q band spatial power combiner with dielectric lens FLuS was made and measured, showing the excellent performances of this innovative FLuS transition.

Vallett, L., Fantauzzi, S., Di Paolo, F. (2022). An Innovative Lens Type FinLine to Microstrip Transition, 1-26 [10.1007/s10762-022-00869-z].

An Innovative Lens Type FinLine to Microstrip Transition

Di Paolo, F
2022-08-18

Abstract

Due to the disadvantages of vacuum tubes in terms of warm-up time, size, and highvoltage needs, solid-state power amplifiers (SSPAs) with gallium nitride (GaN) monolithic microwave integrated circuits (MMICs) are the key solution for power levels up to some kilowatts in continuous wave. An SSPA is the most convenient solution for these RF power levels due to its low weight, small size, negligible warm-up time, low-voltage operation, and high reliability. Spatial power amplifiers (SPAs) combining techniques are the best candidates for SSPAs due to the intrinsic low attenuation in dividing and combining functions. SPAs mainly use two types of probes: transverse and longitudinal, such as FinLines. This paper describes a broadband FinLine to microstrip (FLuS) transition based on dielectric lens theory. Comparative simulations with traditional FinLine transitions show a significant improvement in matching performances and a very significant increase in mechanical resistance of the transition. The proposed innovative FLuS uses a substrate shaping designed according to dielectric lens theory. Frequency simulations of a FLuS inside the WR22 waveguide are shown. These evidence the better performances of this transition than the classic FLuS transition using quarter-wave transformer (QWT) matching. A Q band spatial power combiner with dielectric lens FLuS was made and measured, showing the excellent performances of this innovative FLuS transition.
18-ago-2022
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore ING-INF/01 - ELETTRONICA
English
FinLine to microstrip transitions - Q band - Dielectric lens - Spatial power combiners - Multiphysics simulations
https://link.springer.com/article/10.1007/s10762-022-00869-z
Vallett, L., Fantauzzi, S., Di Paolo, F. (2022). An Innovative Lens Type FinLine to Microstrip Transition, 1-26 [10.1007/s10762-022-00869-z].
Vallett, L; Fantauzzi, S; Di Paolo, F
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/305314
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