Abstract:
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 sections (28, 38, 48) for supplying power 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 incorporating a filter and arranged such that signals are not mixed each other even when signals of a plurality of frequency bands are transmitted/received can be obtained.
Abstract:
A dielectric ceramic composition which can be formed into a built-in or multilayer structure through simultaneously firing with a low resistance conductor such as Ag or Cu and can be fired at 800 to 1000°C into a dielectric ceramic exhibiting a dielectric constant (ϵr) of 10 or below, a large Qxf0 value and an absolute value of temperature coefficient (tauf) of resonance frequency (f0) of 20 ppm/°C or less whose regulation is easy. The dielectric ceramic composition comprises 5 to 150 pts.wt. of glass component per 100 pts.wt. of main components of the general formula: aZnAl2O4-bZn2SiO4-cTiO2-dZn2TiO4 wherein the molar fractions a, b, c and d of individual components satisfy the relationships: 5.0
Abstract translation:一种电介质陶瓷组合物,其可以通过同时用诸如Ag或Cu的低电阻导体同时烧制而形成内置或多层结构,并且可以在800至1000℃下烧制成介电常数(εr)的介电陶瓷, 10或以下,调节容易的大的Qxf0值和谐振频率(f0)的温度系数(τf)绝对值为20ppm /℃以下。 电介质陶瓷组合物包含5至150重量份 的玻璃成分每100重量份 的主要成分为:aZnAl2O4-bZn2SiO4-cTiO2-dZn2TiO4,其中各组分的摩尔分数a,b,c和d满足以下关系:5.0 <= a <= 80.0摩尔%,5.0 <= b <= 70.0 mol%,5.0 <= c <= 27.5摩尔%,0 <= d <= 30.0摩尔%(条件是a + b + c + d = 100摩尔%)。
Abstract:
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.