摘要:
At least one filter block (25, 35, 45) is formed in a thin and flat dielectric multilayer structure (21) and fixed with radiation elements (2, 3). Each filter block includes at least one of a low-pass filter, a high-pass filter and a band-eliminating filter. On the surface (one major surface) side and/or the side face of the multilayer structure, at least one radiation element (2, 3) being connected with the filter block is provided and feeding parts (28, 38, 48) for supplying signal to the radiation elements are provided on the rear surface of the multilayer structure. Consequently, the antenna and the filter block are integrated and a small surface mountable antenna with a built-in filter of a structure such that signals are not mixed each other even when signals of a plurality of frequency bands are transmitted/received can be obtained.
摘要:
An approximately rectangular plate-shaped radiation member (2) is provided and support portions (4, 6) are attached to lower surface end portions adjacent to a pair of parallel shorter sides of the radiation member (2). The support portion (4) is composed of a laminated circuit member including a laminated demultiplexer and a laminated band pass filter of the reception side and the transmission side respectively connected to the laminated demultiplexer. The radiation member (2) has a power supply terminal (2c) and a ground terminal (2d) at the end portion where the support portion (4) is mounted. The power supply terminal (2c) and the ground terminal (2d) are connected to an antenna terminal (4a) and the ground terminal (4b) of the laminated circuit, respectively. The radiation member (2) has a radiation electrode (2a) where a slot (2b) is formed. The shape of the slot is set so that the radiation electrode (2a) causes resonance in a plurality of frequency bands.
摘要:
A dielectric ceramic composition having a relative dielectric constant ɛr of 15-25 allowing formation of a multilayer ceramic component having an appropriate size, capable of being sintered at a temperature lower than 800-1000°C allowing incorporation and lamination of low resistance conductors of Cu or Ag through simultaneous sintering, and having a low dielectric loss tan delta (high Q-value) and a temperature coefficient tauf of resonance frequency has an absolute value not larger than 50 ppm/°C. The dielectric ceramic composition, 3-30 pts.wt. of lead-free low melting point glass contains 50-75 wt.% of ZnO, 5-30 wt.% of B2O3, 6-15 wt.% of SiO2, 0.5-5 wt.% of Al2O3, and 3-10 wt.% of BaO , based on 100 pts.wt. of principal component represented by a general formula x'Zn2TiO4-(1-x'-y')ZnTiO3-y'TiO2 where 0.15
摘要:
A low temperature sinterable dielectric ceramic composition is obtained by blending 2.5-20 parts by weight of a glass component per 100 parts by weight of an aggregate of dielectric particles which are composed of a Ti-containing dielectric material and contain an oxide including Ti and Zn in the surface portions. A low temperature sintered dielectric ceramic is produced by sintering this low temperature sinterable dielectric ceramic composition at 880-1000˚C. With this low temperature sinterable dielectric ceramic composition, there can be obtained a multilayer electronic component having an internal conductor composed of an alloy containing Ag and Cu or at least one of them.