Yuanfeng She

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This paper presents a measurement method for determining effective conductivity of copper-clad dielectric laminate substrates in the millimeter-wave region. The conductivity is indirectly evaluated from measured resonant frequencies and unloaded Q values of a number of Whispering Gallery modes excited in a circular disk sample, which consists of a(More)
In the millimeter-wave band, the series-fed array antenna is facing a problem of large transmission loss and narrow bandwidth by using a high-permittivity and large-loss-tangent material. In this paper, an air region is inserted in the half of the height in the LTCC waveguide of εr =6.6 and tanδ =0.013 to reduce the transmission loss. The reduction of the(More)
Loss evaluation is important in the link budget of the wireless system in the millimeter wavebands. In order to estimate the antenna gain reasonably, the loss factors of the antenna should be evaluated carefully. This report surveys the gains of the antennas, such as the standard horns, the waveguide slot arrays, the post-wall waveguide slot arrays and so(More)
This paper introduces an example of a small antenna measurement system with the optical fiber link technologies in the millimeter-wave band. The effect of the facilities such as the connect jig and the measurement system should be carefully estimated in the antenna measurement. The radiation patterns of a 60 GHz small package antenna have been measured by(More)
In the millimeter-wave bands, the series-fed array antenna is facing a problem of large transmission loss and narrow bandwidth by using a high permittivity and large-loss tangent material. In this report, an air-layer is inserted in a LTCC waveguide of εr=6.6 and tanδ=0.013 to reduce the transmission loss. The reduction of the equivalent dielectric constant(More)
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