Multi-Layer Material Characterization at Ka-Band Using Bayesian Inversion Method

Ka-band phased array system characterization

Complex permittivity measurements at Ka-Band using rectangular dielectric waveguide

The rectangular dielectric waveguide (RDWG) technique has been developed for the determination of the dielectric constant of materials from effective refractive index measurements in the Q and W bands. This paper describes the use of an optimization method in conjunction with the RDWG technique for the determination of both the dielectric constant and loss tangent of materials at Ka-Band. The e...

Multi-layer System-on-Substrate for Ka-band Foreign Object Debris (FOD) Detection Sensor

Presence of Foreign object debris (FOD) at airport runways is an immense threat to flight safety. Such objects may cause potential damage to the aircraft especially during the take off and landing. This paper introduces the design of a low-cost Ka-band FOD radar sensor adopting state-of-the-art system-on-substrate (SoS) approach. Contrary to the reported single-layer SoS design approach, multi-...

Ka - Band Linearization

The new Ka-band communications services require highly linear, high power amplifiers (HPAs). Traveling wave tube amplifiers (TWTAs) offer the best millimeter wave HPA performance in terms of power and efficiency, but are inferior to solid state power amplifiers (SSPAs) in linearity. This paper discusses techniques for improving millimeter wave HPA linearity. The significance and methods for eva...

K/Ka-band Channel Characterization for Mobile Satellite Systems

Mobile satellite systems allow truly ubiquitous wireless communications to users anywhere and anytime, NASA’s Advanced Communications Technology Satellite (ACTS) provides an ideal spacebased platform for the measurement of K/Ka-band propagation characteristics in a land mobile satellite application. Field tests for K-band propagation were conducted in three basic environments: clear line-ofsigh...