摘要:
A laminated filter includes: a first dielectric layer having a first shield electrode on one principal plane; a second dielectric layer having resonator electrodes on one principal plane; a third dielectric layer having a coupling electrode provided facing part of the above-described resonator electrodes; a fourth dielectric layer having a second shield electrode on one principal plane; a fifth dielectric layer whose at least one principal plane is exposed outside; and a grounding electrode provided on the other principal plane of the above-described dielectric layer and/or the above-described one principal plane of the above-described fifth dielectric layer, and the above-described first grounding electrode and the above-described first shield electrode are electrically connected through a via hole provided in the above-described first dielectric layer.
摘要:
A 3-frequency branching circuit in the past could not be used for a system wherein a TDMA method such as GSM and DCS and a W-CDMA method such as UMTS are mixed. The 3-frequency branching circuit equipped with branching means having first and second internal terminals, an antenna terminal of connecting to an antenna, a low-pass filter connected between the first internal terminal and the antenna terminal, and a high-pass filter connected between the second internal terminal and the antenna terminal, a switching circuit of switching between GSM TX and GSM RX, a switching circuit of switching between DCS TX, DCS RX and a third internal terminal, and a duplexer connected to the third internal terminal.
摘要:
The present invention provides a small and low loss laminated bandpass filter by placing two strip lines 313 and 314 that form a resonator in a certain distance on the same layer and thereby electromagnetically coupling these strip lines.
摘要:
A mulitlayer ceramic device improves device functionality, reduces overall device size and profile, makes manufacturing easier, and improves reliability. A first ceramic layer 1 has a first multilayer circuit pattern 2 electrically connected through via holes 3. A second ceramic layer 2 also has a second multilayer circuit pattern 2 electrically connected through via holes 3. A thermosetting resin sheet 17 is disposed between the first and second ceramic layers. The thermosetting resin sheet has through holes filled with a conductive paste for electrically connecting one of multiple circuit pattern layers in the first ceramic layer with one of multiple circuit pattern layers in the second ceramic layer.
摘要:
A multilayer ceramic device improves device functionality, reduces overall device size and profile, makes manufacturing easier, and improves reliability. A first ceramic layer has a first multilayer circuit pattern electrically connected through via holes. Also, a second ceramic layer has a second multilayer circuit pattern electrically connected through via holes. A thermosetting resin sheet is disposed between the first and second ceramic layers. The thermosetting resin sheet has through holes filled with a conductive paste for electrically connecting one of multiple circuit pattern layers in the first ceramic layer with one of multiple circuit pattern layers in the second ceramic layer.
摘要:
A diplexer capable of passing signals of a high frequency band without being attenuated over a wide frequency band, and a high-frequency switch using the diplexer are provided. The diplexer includes a low-pass filter 82 having a parallel resonant circuit formed by a first capacitor C1 and a first inductor L1 and a serial resonant circuit formed by a second capacitor C2 and a second inductor L2. With this structure, two attenuation poles are provided in the low-pass filter 82. Thus, a passband of a high-pass filter 83 can be widened.
摘要:
A layered body of a SAW filter includes a surface dielectric layer having a surface layer electrode pattern formed thereon, and a first dielectric layer having a pair of electrode patterns and a first ground electrode pattern formed thereon. A pair of balanced output terminals of SAW filters of unbalanced input-balanced output are connected respectively to the pair of electrode patterns via the surface layer electrode pattern, and a part of the first ground electrode pattern is disposed between the pair of the electrode patterns.
摘要:
A high frequency switch having a plurality of signal paths for four frequency bands, the high frequency switch, has branching means, first and second transmission reception changeover means connected to the branching means, and a plurality of filters placed in the plurality of signal paths, the first transmission reception changeover means has a first common transmitting end for transmission signals of the first frequency band and the second frequency band, a first receiving end for a reception signal of the first frequency band, and a second receiving end for a reception signal of the second frequency band, and the second transmission reception changeover means has a second common transmitting end for transmission signals of the third frequency band and the fourth frequency band, a third receiving end for a reception signal of the third frequency band, and a fourth receiving end for a reception signal of the fourth frequency band.
摘要:
An antenna duplexer has a receiving filter having a surface acoustic wave device; a transmitting filter having a dielectric resonator; and a matching circuit for matching the receiving filter and the transmitting filter with an antenna respectively, wherein the transmitting filter, receiving filter, and matching circuit are integrated with each other.
摘要:
An inter-digital transducer has a piezoelectric substrate; and an IDT (inter-digital transducer) electrode having a pair of upper bus bar electrode and lower bus bar electrode placed facing each other on the piezoelectric substrate and a plurality of electrode fingers placed on the piezoelectric substrate each being led out from either the upper bus bar electrode or the lower bus bar electrode toward the other bus bar electrode, wherein the IDT electrode is constructed of a plurality of divisional IDT electrodes and connected to a balanced type terminal.