Optimized Multipactor-Resistant Wedge-Shaped Waveguide Bandpass Filters

Abstract

Abstract-Wedge-shaped waveguides present a certain advantage with respect to rectangular waveguides regarding their resistance to multipactor discharges. In this paper, the optimal configuration for the wedge geometry is investigated based on theoretical results, a precise multipactor prediction tool and previous experience. In addition, design rules are presented, which allow to achieve comparable electrical performances of wedgeshaped filters to rectangular waveguide filters, whilst at the same time improving the multipactor-free power range. As a proof of concept, two three-pole bandpass filters with equivalent electrical characteristic of 150 MHz bandwidth, centered at 12 GHz (Ku band), and the same Q factor have been designed, manufactured and tested. The first design is based on conventional rectangular waveguide technology, while the second one has non-parallel broadside walls (wedge-shaped cross section). The multipactor power threshold and RF performance of the filters have been measured in order to validate the improvements achievable employing wedge-shaped resonators.

A compact L-band bandpass filter based on SIR coaxial resonators with high multipactor threshold

“…Filters or multiplexers located at the Tx part of the payload and channeling high power levels are particularly sensitive to multipactor effect. For several years, multipactor effect has been a central concern in the design of filters dedicated to space applications [4]. It should be remembered that the transmission (Tx) and receiving (Rx) paths of the payload, designate the output and the input, respectively, of the payload of the satellite and have very different power levels: high for the Tx and low for the Rx.…”

Análisis del efecto multipactor en guías de onda de geometría cilíndrica

“…Hay muchas publicaciones al respecto en la literatura científica, las cuales consideran el problema del efecto multipactor en dispositivos de microondas con geometrías simplificadas, en las que es posible utilizar un método analítico [1,19]. Estos métodos han permitido el desarrollo de varias herramientas numéricas con la capacidad de simular el efecto multipactor en diferentes geometrías, tales como las placas plano paralelas [46], las ventanas dieléctricas [47], las guías rectangulares y guías con sección transversal en forma de cuña [48,49,50], las líneas microstrip [51], los irises de guías de ondas [52,53], las guías coaxiales [25,39,41,48]. Sin embargo, el análisis del efecto multipactor en guías circulares no ha sido analizado en detalle.…”