3-D low-loss coplanar waveguide transmission lines in multilayer MMICs

Abstract

Newly developed transmission-line structures using the great flexibility of three-dimensional multilayer technology have been designed and fabricated. In this paper, we demonstrate that monolithic microwave integrated circuit (MMIC) coplanar waveguide transmission lines with a wide range of characteristic impedances can easily be designed using the multilayer technique. Furthermore, this implementation can avoid the well-known current crowding effects on the conductor edges minimizing dissipation loss. The system of three layers of metals and two layers of sandwich polyimide as dielectrics was employed. The fabricated transmission lines have been characterized providing a wide range of impedances from 10 to 70 . In addition, the effects of unintentional horizontal and vertical coupling in multilayer MMICs have been investigated. The results indicated that an optimum separation of 75 m is necessary for negligible coupling ( 30 dB).

Characterization of high impedance of multilayer coplanar waveguide transmission line design for integration with nanodevices

“…The set of low-loss 3-D CPW transmission lines with characteristic impedance ranging from 10-50 to 70 Ω is examined [12]. The values of characteristic impedances can reach even higher levels by changing the dimensions of the transmission line like the width of the signal strip or the width of the gap in CPW.…”

“…The application of conventional CPW has very limited range of characteristic devices. The practical size of the slot and the width of the center plane limit the fabrication and high losses result in current crowding effect at the conductor edges [12]. Paper [12] provides the fabrication and simulation results of the CPW transmission line with the characteristic impedance from 10 Ohm to 70 Ohm, by applying the multilayer technique.…”

“…The practical size of the slot and the width of the center plane limit the fabrication and high losses result in current crowding effect at the conductor edges [12]. Paper [12] provides the fabrication and simulation results of the CPW transmission line with the characteristic impedance from 10 Ohm to 70 Ohm, by applying the multilayer technique. The research achieved to evaluate the current crowding effect on the conductor edges which minimizes dissipation loss.…”

Multilayer Coplanar Waveguide Transmission Lines Compatible with Standard Digital Silicon Technologies

“…MCPWs have been previously proposed to reduce loss and achieve a large range of impedance in MMICs , and are also referred to as (center-)elevated CPW [4]- [7]. Most of these prior work focused on traditional MMIC technologies such as GaAs, and hence usually require additional process steps.…”

RF characterization of unipolar nanorectifiers at zero bias

“…1 Introduction Over the past few decades, the development of high-frequency rectifiers into microwave, terahertz, and light frequencies has become a major area of research. These devices, such as Schottky diode, heterojunction bipolar transistor (HBT), and planar-doped barrier diode (PDBD), are mainly used in the detection systems which have many applications, including security and defence, medical and healthcare, communication, and radio astronomy [1][2][3][4][5].…”