An Experimental MM-Wave Path Length Modulator

Abstract

A modulation scheme in which the transmission path length of the mmwaoe signal is digitally modulated by means of a PIN diode switch has been proposed for the waveguide transmission system. To demonstrate the feasibility of this proposal, a complete transmitter has been developed in the 50 ~ 60-GHz range, consisting of an IMPATT oscillator, circulator, PIN diode switch, and its driver circuit. The model can handle signals at SOO Mb/s and deliver 100 mW of modulated power at the output. This paper describes the design considerations of each component in detail, together with the experimental results.

Ultra-Wideband Six-Port Network Miniaturization—Matching

“…For the case of complex-to-complex matching, which is referred to the matching of interstage components as shown in Fig. 4(b) (for example, the PD with one of the HCs), we contribute here a generalization of the procedure stated in [28][29][30]. Herein the two hyperbolic means of the components named A and B are computed and then are complex conjugate matched together via the addition of a properly assessed interconnecting transmission line.…”

“…In the current section, the improved matching methodology for the HCs and PD and its interrelation with the miniaturization approach are stated. Broadband matching, applied in general to diode-mixers design [28][29][30], is adopted and extended herein for matching passive devices. In mixer design, although a wideband operation is sought, the diode impedance changes with time driven by the local oscillator large signal as well as with frequency.…”

“…Table 2 depicts the Z low , Z high and the estimated Z m for each port of the HC and PD. The appropriate matching transmission line characteristic impedance and electrical length 𝜃 = 𝛽l are extracted herein through an algebraic manipulation of those given in [28][29][30]:…”

“…In order for the compactness and wide BW to be accompanied with compliant S-parameters (accurate amplitude and phase response), we focus our attention on the transmission lines interconnecting the component devices (PD and HCs) constituting the SP. The required geometrical characteristics of those lines are properly calculated utilizing a broadband matching technique, which, in general, is applied to diode mixer design [28][29][30]. This technique is adopted and extended herein in order to formulate a generalized approach for matching passive components.…”

WT4 Millimeter Waveguide System: Semiconductor Devices for the WT4 Repeater

“…9 A "doping well" is formed by the shallow p + indiffusion and steep doping tail from the n + substrate. This constitutes an optimum structure from the standpoint of maximum breakdown voltage, minimum capacitance per unit area, low resistance, and fast switching speed.…”