Murata Manufacturing Co., Ltd.

Norihiro Shimada

Ken Tonegawa

Tomoya Bando

Yoshihiro Yoshimoto

Jun Sasaki

Harufumi Mandai

Teruhisa Tsuru

A receiving module and a TDMA-system receiver are adapted to broadening of bands of received signals and low frequencies of intermediate frequency signals. These apparatuses can be made compact and contribute to cost reduction. The receiving module is constituted of a low-noise amplifier, a high frequency LC filter, a Gilbert-cell type mixer, and baluns. A signal received by an antenna is amplified by the low-noise amplifier and is passed through the LC filter. After that, the signal is mixed with a local oscillation signal by the Gilbert-cell type mixer to be converted into an intermediate frequency signal.

Receiving module and receiver

A high-frequency composite component can achieve reduction in size and weight, while providing high performance. A portable wireless device incorporates the high-frequency composite component, including a multi-layer substrate, with a low noise amplifier LNA and a band pass filter BPF constituting parts of a high-frequency circuit, with an input terminal, an output terminal, and control terminals on the substrate. The low noise amplifier LNA is constituted of transistors, an inductor, capacitors, and resistors. The band pass filter BPF is constituted of strip lines, an inductor, and capacitors. The low noise amplifier LNA and the band pass filter BPF are connected with each other within the substrate via a matching capacitor. The amplifier ground and filter ground are separated within the substrate and connected respectively to separate ground terminals on the substrate. In another embodiment, the high-frequency composite component may include a mixer and a high-pass filter integrated with a multi-layer substrate.

High-frequency composite component and portable wireless device incorporating the component

A high-frequency filter serving as a bandpass filter has three transmission lines SL to SL side-coupled in three stages. The transmission lines SL to SL are respectively connected in parallel to capacitors C to C . One end of the input transmission line SL is connected to an input terminal Pi through an input capacitor C . One end of the output transmission line SL is connected to an output terminal Po through an output capacitor C . The other ends of the transmission lines SL and SL are connected and the connection point is connected to the ground through an inductor Lg for forming a pole. One end of the transmission line SL is connected to the ground.

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Shiga-ken, Japan

Norihiro Shimada