Sumitomo Chemical Company, Limited

Nippon Sheet Glass Company, Limited

Hitachi, Ltd.

Hitachi Electronics Engineering Co., Ltd.

Nobuya Niizaki

Harunori Murakami

Yuji Baba

Hirofumi Natsume

Masato Arisawa

Kanta Urakami

Shinichi Hayashi

Susumu Miyazaki

Tsuyoshi Nakano

Hideho Yamamura

Junichi Yasukawa

Miki Matsumura

Takashi Saitoh

A glass antenna system for an automobile comprises a T-shaped or pi-shaped dynamic impedance matching circuit. Another system comprises an integrated circuit consisting of T-shaped FM and AM matching circuits each connected to a common cable. The T-shaped or pi-shaped matching circuit comprises at least two varactor diodes each applied to a channel selection voltage to match the FM antenna impedance with that of the FM receiver including that of the transmission cable.

Glass antenna system for automobile

Glass antenna system for automobiles

There is provided a method of forming a micro-patterned functional film with a high precision on a substrate comprising:

Method of forming a functional film

A glass antenna for an automobile uses a coil connected directly to a bus for defogging heaters as an FM subsidiary antenna and a T-shaped impedance matching circuit to provide a monotone change of impedance within the FM frequency band. A reverse T-shaped FM main antenna is employed in conjunction with the FM subsidiary antenna to provide a diversity system to enhance receiving sensitivity in entire directions. The T-shaped matching circuit comprises at least two varactor diodes each applied to a channel selection voltage to match the FM antenna impedance with that of the FM receiver including that of the transmission cable.

Glass antenna for automobile

The delay circuit of the present invention has a CR integrator including a variable capacitance diode. This CR integrator is arranged between the first and second comparators. By applying a constant DC comparison voltage to the other input terminal of the second comparator, delay amounts can be selectively changed for the leading and trailing edges of the pulse waveform.

Delay circuit including an improved CR integrator circuit

Growing community of inventors

Yokohama, Japan

Nobuya Niizaki