Nonuniform Layer Model of a Millimeter-Wave Phase Shifter

Nonuniform layer model of an image‐guide millimeter‐wave phase shifter

“…Therefore, it is convenient to reduce Eq. (7) to a series of first-order equations [10]. Next, the transverse wave number k x of the vertical slab guide of width 2a and dielectric fill re slab obtained from Eq.…”

“…In addition, among the derivatives of the dielectric waveguide, optical control of the rib guides and image guides (both with a single uniform plasmadensity layer on top) have been studied [9]. The analysis of the planar dielectric-slab guide is the only one which included a nonuniform-layer model for the plasma distribution [10]. Furthermore, several semiconductor-loaded rectangular waveguides structures have been proposed for optical control [11,12].…”

<title>Electronically steerable semiconductor-based MMW antennas</title>

“…Figure 1 illustrates the refractive index as a function of plasma density (see Appendix). 10 At MMW frequencies a wave propagating through a plasma experiences not only a phase shift but also strong attenuation. Plasma losses make the device impractical.…”

Microwave Properties of an Inhomogeneous Optically Illuminated Plasma in a Microstrip Gap

“…Some of these include plasma antennas, tuneable frequency selective surfaces (FSS), generation of millimetre wave pulses, beam scanning antennas and tuneable phase shifters [1,2,3]. Millimetre wave tuneable phase shifters have been investigated using both and microstrip [3,4] and waveguide [4,5] architectures. The success in designing such devices for practical applications depends on accurately simulating the microwave properties of the optically illuminated plasma.…”

“…Here lumped element modelling is no longer valid and propagation through the plasma must be considered. Although such propagation effects have been considered for waveguide structures [4], we believe this is the first such study for microstrip circuits. This paper presents measured and modelled results for illumination of a microstrip gap from DC up to 50 GHz.…”