A Broadband Millimeter-Wave Waveguide Power Divider with High Isolation

Abstract

In this paper, an E-plane stepped-impedance transformer and Y-junction bifurcation are used to form a waveguide power divider with ceramic substrate loaded with thin film resistors. This structure is realized high isolation in V-band by inserting a ceramic substrate at the H-plane center of the Y-junction waveguide bifurcation, both sides of which loaded with thin film resistors. The waveguide power divider was fabricated with aluminium-50% silicon, and has characteristics of light weight, lower coefficient of thermal expansion, good thermal conductivity, and its properties are more compatible with those of ceramic substrate. The principle and design procedure are described in detail. A V-band E-plane waveguide power divider is designed, fabricated, and measured. The measured results show that insertion loss is less than 0.4dB in the frequency range of 50∼60GHz, with typical isolation levels of 25dB between the two output ports and amplitude imbalance less than 0.19dB, phase imbalance less than 1.4°. The measured and simulated results show good amplitude, phase, and isolation characteristics validating the proposed power divider.

Millimeter-Wave Wideband Waveguide Power Divider With Improved Isolation Between Output Ports

“…To the authors' knowledge, this design is the first to achieve such a remarkable fractional bandwidth and simultaneously provides good isolation between the ports. Moreover, unlike the designs in [11,12], the fabrication complexity is simplified as the septum is no longer required and the capability of the power handling is increased since the termination is independent on the transmission from the input port to both output ports. Table II compares and summarizes the performance of the proposed design with state-of-the-art equal power dividers.…”

“…However, it cannot be employed for high frequencies, since the structure's dimensions become too small for fabrication at mm-wave frequencies. In [10,11], a resistive septum was introduced in the waveguide divider at Ka-band and V-band, respectively, providing decent isolation and output matching. However, the resistive septum could dissipate some of the incident power resulting in extra insertion losses.…”

Terahertz Power Divider Using Symmetric CPS Transmission Line on a Thin Membrane

“…Furthermore, many mm-wave/THz PDs have been intro-duced using different structures such as waveguide [35]- [37], Wilkinson [38], [39], planar Goubau lines (PGLS) [40], graphene plasmonic waveguide [41], electromagnetic bandgap (EBG) waveguide [42], directional coupler waveguide [43], substrate integrated coaxial line [44], and CPW-CPS [45].…”