realize broadband absorber. However, when we study the surface current distribution, it seems that the physical origin is similar to polarization conversion that we have researched [2]- [5]. What's more, similar structure has been designed to realize broad band polarization conversion at Terahertz [6].Our conclusion is that it should be cross-polarization conversion rather than absorption. The structure in [1] is resimulated by a commercial software CST MICROWAVE STUDIO and the simulation results confirm with our conclusion. The resimulated reflectance with different polarization are illustrated in Figure 1. The copolarized reflection is low; however, the cross-polarized reflection is very strong.According to the polarization conversion effect of this structure, it can be concluded that |S 11 | 2 5 |S co | 2 1 |S cross | 2 [7], where |S 11 | is the total reflection, |S co | and |S cross | are co-and cross-polarized reflection coefficients respectively. In Figure 2, the |S 11 | 2 is shown and its value is over 0.84 in the simulation frequency range.The absorption is expressed as A 5 1 2 |S 11 | 2 2 |S 21 | 2 , where |S 21 | is the transmittance. The correct absorption is depicted in Figure 3. As is shown, the structure do not have strong microwave absorption effect and should not be considered as an absorber. For other incident angle, the conclusion is similar.The surface currents shown in Figures 6 and 7 from [1] are similar to the previous work which performance as a cross polarization convertor [2]. The explanation in section 4 of [1] should be the mechanism of the polarization conversion rather than the mechanism of absorption.Finally, we hope our work may reduce the misunderstanding of [1]. In the above-mentioned article, which appeared in Microwave and Optical Technology Letters, Volume 58#3, DOI 29633, there was an error in the title. The title as published was incomplete. The corrected, complete title is shown below: DESIGN OF DOUBLE RING HYBRID USING INTEN-TIONALLY MISMATCHING METHODWe apologize for this error and regret any confusion that was caused.
In this article, we suggest a new design method of the unequal Wilkinson power divider. The line impedances of the proposed formula are decided after the resistor value is arbitrarily chosen, while the isolation resistor of the conventional unequal Wilkinson power divider is derived by the power ratio. Therefore, using the proposed formula, the more accurate resistor value is applicable to the Wilkinson power divider, and a narrow line width is improved up to 46.5% in 10:1 Wilkinson power divider. The proposed design formula of the Wilkinson power divider is derived, and the proposed formula is verified by the fabrication and measurement results. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2450–2452, 2016
A new ring hybrid is proposed which we call the double ring hybrid. The double ring hybrid is implemented by cascading two branch line hybrids that have intentionally mismatched port impedances between branch line hybrids. The proposed double ring hybrid using two quadrature branch line hybrids not only has the same function as that of the conventional ring hybrid, but also has output ports in the same direction, since the isolation port is located on the opposite side of the output ports. Thus, unlike the conventional ring hybrid, the proposed double ring hybrid may be able to realize cascaded planar structures. The design equations are derived from the concept of the intentionally mismatched port impedances. The proposed double ring hybrid, regardless of whether the two branch line hybrids are connected, has a 12% reduced area compared to the conventional ring hybrid. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:638–642, 2016
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