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High-Q dielectric materials ilmenite MgTiO3, columbite MgNb2O6 and cubic perovskite Ba3NiTa2O9 with negative temperature coefficient of resonant frequency (τf) were selected as candidates for compensating the τf of hexagonal perovskite Ba8ZnTa6O24. X-ray diffraction data shows that Ba8ZnTa6O24 coexists with Ba3NiTa2O9 but is not compatible with MgTiO...
A sensitive coefficient was put forward to study the effect of random errors on the directivity of six amplitude-weighted line arrays. Studies show that: random errors cause the loss of directivity, and amplitude weights influence that kind of loss slightly. In addition, that kind of loss has a linearity relationship with the distance between neighboring units; and the larger the line array is, the...
This paper presents a newly dielectric embedded quasi-microstrip Yagi antenna with barrier (DE-QMYAB). It is a improved structure from dielectric embedded quasi-microstrip Yagi antenna (DE-QMYA).The parasitic patches are arranged nearby each main element patch. So as to the configuration of reflectors are formed. The electromagnetic wave is bared by the parasitic patches. This results in antenna performance...
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