Kyocera Corporation

Hiroshi Yoshizaki

Akinori Sato

Kazuo Watada

Shunichi Murakawa

The invention provides an antenna apparatus including a driven element formed of a rectangular conductor, and a grounding plate which is arranged in proximity to at least one of side edges of the driven element, with a predetermined interval secured therebetween. This construction requires less mounting space, achieves wide bandwidth and low conductor loss.

Antenna apparatus

The helical antenna comprises a base body and a helically-configured conductor on a top surface of the base body, wherein base body's thickness a is given as 0.3&lE;a&lE;3 (mm); length b is given as 5&lE;b&lE;20 (mm); and relative dielectric constant &egr;r is given as 3&lE;&egr;r&lE;30, and conductor's winding number x is given as 3&lE;x&lE;16 (turns), and its resonant frequency f and conductor width w satisfy formulae (1): f&equals;Ax&plus;By&plus;C (MHz) and (2): w&equals;Dx&plus;E (mm), where y represents base body width and A through E represent constants determined according to the base body's thickness a, length b, and relative dielectric constant &egr;r.

Helical antenna and communication apparatus

It is an object of the invention to provide a meander antenna that is smaller and lighter, in which the resonance frequency easily can be tuned, as well as a method for tuning its resonance frequency. The meander antenna comprises a meandering conductor on the surface of a substrate. The meander antenna is provided with a short-circuit conductor line that forms a short-circuit between two parallel opposing lines into which the conductor is bent, or an open conductor line in which a line short-circuiting the two parallel opposing lines is open. The resonance frequency can be tuned and lowered by cutting open the short-circuit line or increased by short-circuiting the open conductor line.

Growing community of inventors

Kyoto, Japan

Hiroshi Yoshizaki