Soshin Electric Co., Ltd.

Masaki Urano

Yasuhiko Mizutani

Takami Hirai

Hironobu Kimura

Hirotaka Takeuchi

Kouhei Takase

Takenori Kasai

A first passive component includes one unbalanced line having one unbalance input terminal, one balanced line installed opposite to the unbalanced line and having two balanced output terminals (first balanced output terminal and second balanced output terminal), and a capacitor formed between the balanced line and a fixed potential (e.g. the ground potential). Furthermore, the relation d&#x3e;dis satisfied, where dis the physical length of the unbalanced line and dis the physical length of the balanced line.

Passive component

A passive part includes a filter unit having first resonance electrode to a third resonance electrode and an impedance matching circuit unit electrically connected to the third resonance electrode of the filter unit arranged on a dielectric substrate. The entire passive part has a configuration including a circuit unit equivalent to characteristic containing the second impedance matching circuit by an impedance component of the third resonance electrode. For example, by modifying the width of the third resonance electrode, it is possible to adjust the impedance in the same way as when a capacitance as the impedance matching circuit unit is connected, without connecting any capacitance.

Module and passive part

A dielectric substrate includes a filter unit, a non-balance/balance conversion unit, and a connection unit for electrically connecting the filter unit to the non-balance/balance conversion unit which are formed in the dielectric substrate. A first resonator has an electrode formed on the main surface of a fourth dielectric layer and a via hole penetrating through a first to a third dielectric layers and connecting the electrode to a grounding electrode. A second resonator has an electrode formed on the main surface of the fourth dielectric layer and a via hole penetrating through the first to the third dielectric layers and connecting the electrode to the grounding electrode.

Passive part

A passive component comprising one input electrode layer constituting an input terminal, one output electrode layer constituting an output terminal, and four shield electrode layers constituting shield terminals, all formed in the lowermost dielectric layer by via holes. The input electrode layer is connected electrically with an input-side resonance electrode, in the vicinity of the second side face of a dielectric substrate, through a via hole made in the fourth through sixth dielectric layers and an input tap electrode. The output electrode layer is connected electrically with an output-side resonance electrode, in the vicinity of the third side face of the dielectric substrate, through a via hole made in the fourth through sixth dielectric layers and an output tap electrode.

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Saku, Japan

Masaki Urano