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Complex permittivity of a low loss dielectric rod are often evaluated by a perturbation method using a TM010 mode cavity in microwave region, since the method is an extremely simple and easy treatment for not only experts but also non-experts. However, there are few reported to apply the perturbation method using millimeter wave band because a cavity dimension of the scale model is too small and is...
Millimeter wave frequency bands have been explored to enhance the radio resource. Developments of low loss millimeter wave filters are also expected. In this paper, a low loss Ka-band 2-pole narrowband bandpass filter for a planar type circuit is proposed. The filter is constituted with a coplanar type circular slot resonator with a dual resonance mode and high Q value. The simulated and measured...
A sapphire is expected as a good substrate for a low loss millimeter wave circuit such as a superconductor filter, because a good YBCO film can be manufactured on the substrate. In order to design millimeter wave circuits, it is necessary to obtain the accurate complex permittivity. However, there are few reports for sapphire substrates in millimeter wave region. In this paper, the measured complex...
Copper-clad dielectric substrates are commonly used to construct a planar circuit such as microstrip line and coplanar waveguide etc. Generally, an adhesive surface of a copper film is roughened to increase peel strength from a substrate. A measurement method of the interface conductivity for copper-clad dielectric substrates has been presented, which is based on the dielectric rod resonator method...
Many millimeter wave circuit designers require complex permittivity of low εr film materials with excellent characteristics. However, there are few accuracy measurement methods for film materials in millimeter wave region. In this paper, a high precision measurement method for dielectric film materials in 60GHz band are proposed on the basis of a cavity resonator method. The measured results validate...
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