Microwave
2015
Abstract:
In this article, a novel phase shifter base on half mode substrate integrated waveguide (HMSIW) whose characteristics can be reconfigured electronically by simply loading it with electromagnetic bandgap (EBG) unit-cells at 9.5 GHz is presented. The prototype of phase shifter contains an HMSIW as a transmission line and four metamaterial structure as a load on the one side of the Transmission Line. These loads with junctions (or PIN diode) can be connected to HMSIW. To obtain different radar bit-phases for S21 , we change the situation of junctions (or PIN diode). For demonstration purposes, controllable phase shifters are designed, fabricated, and measured to give excellent performance for X-band applications. The phase shifter has bandwidth around 0.38% at 9.55 GHz. Design method is based on simulation of EBG cells in different position and changing reactance of the phase shifting elements which help us to modify our phase shifter for different phases .
Kuhestani, Hamed, Mohammad Naser‐Moghadasi, Mahshid Maleki, and Ferdows B. Zarrabi. "Phase shifter designing base on half mode substrate integrated waveguide with reconfigurable quality." Microwave and Optical Technology Letters 57, no. 11 (2015): 2562-2567.
SIW coupler
2014
Abstract:
In this paper, a cruciform coupler with half mode substrate integrated waveguide (HMSIW) structure is presented. The prototype coupler consists of four half mode SIW structures which are crossing each other at right angles. Also, two metallic posts are inserted in free section of junction in order to make coupling properties. Compact size and broadband operation are the features of this coupler. The size of coupler is reduced 24% in comparison to previous HMSIW cruciform couplers. A fractional bandwidth of about 35 % is obtained. The coupler is designed and simulated by HFSS13. Here, the simulation results are compared with experimental results.
Mansouri, Zahra, Mitsuyoshi Kishihara, Ferdows B. Zarrabi, and Fatemeh Geran. "Modified Broadband Half Mode Substrate Integrated Waveguide Cruciform Coupler." Applied Computational Electromagnetics Society Journal 29, no. 11 (2014).