A design of H-plane magic tee at W band

Abstract

Magic tee is a widely used component in microwave systems; the four arms of conventional magic tee direct at four different directions, which give inconveniences to the assemblage of a system. In this paper, a narrow-wall slot directional coupler and an E-plane dielectric loaded waveguide phase shifter is used to form a magic tee with four arms in the same H-plane. The magic tee is analyzed with mode matching method; Simulation results are presented, which show good performance. A fourhorn monopulse antenna feed system composed of this kind of magic tee and the broad-wall slot directional coupler based magic tee is presented, and this kind of system is more compact than a traditional monopulse antenna feed system.

Establishment of open web platform based on 3D head model for product adaptability analysis and evaluation

“…On the other hand, Wang et al. [ 23 ] developed a fitting algorithm based on the progressive scanning of different facial feature regions and on contouring sampling performed on the scanning layers, which were reconstructed and fitted using 3D software. The researchers created standard digital head models in different percentiles of head circumference and used them as a design service tool for physiological comfort optimization in wearable product design and other ergonomic evaluation programs.…”

Modal Analysis of Directional Coupler and Its Equivalent Circuit

“…Also, , ---, , -and , / are the unknown amplitude coefficient of the transmitted &$ % modes in waveguides 3, 2, and 5, respectively. In the references [8] and [9], authors have used negative coefficient for ) and ( 1 2 , # ) , respectively we get:…”

“…This paper uses the mode-matching technique directly to design the directional coupler. The design method is based on the field expansion into the normalized incident and scattered waves [6]- [9]. The theory yields the modal S-matrix of the directional coupler directly.…”

Design of a w-band monopulse comparator based on E- and H-plane waveguide couplers

“…[1]- [2], magic T-junctions [3]- [4], and slot or branch line couplers [5]- [6] can be utilized in realizing the comparator.…”

“…Although the concept of using E-plane branch-line couplers and H-plane Riblet couplers in tandem for a monopulse comparator is given in [5], its detailed design has received little attention in open literature. In this paper, we present a theoretical design of a W-band waveguide monopulse comparator based on E-plane branch line couplers and H-plane Riblet couplers .…”