Title:
SHARED ANTENNA DEVICE AND PORTABLE RADIO UNIT USING THE ANTENNA DEVICE
Document Type and Number:
Japanese Patent JP3472421
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To use a unified antenna to both satellite communication and terrestrial communication by adding a linear radiation element to the tip of a feeder pin which supplies a high frequency current to a microstrip planar antenna via a capacitive element.
SOLUTION: An MSA (microstrip planar antenna) 1 functions as a circular polarized antenna by the 1st frequency when the parameters such as the relative dielectric constant, size, thickness, etc., of a dielectric substrate 1c, the size of a radiation element 1b, and the positions, etc., of a feeder pin 1a are properly designed. A linear radiation element 8 works as a grounded liner polarized antenna by the 2nd frequency via a helical antenna that is placed under a ground conductor 4. A capacitive element 7 is connected to the upper end part of the pin 1a of the MSA 1, and the element 8 of the helical antenna, etc., is connected to the upper part of the element 7. The mutual interference is reduced between the 1st and 2nd frequencies via the element 7 and the radiation pattern of the circular polarized wave is particularly improved.
Inventors:
Akihiro Suguro
Application Number:
JP29038896A
Publication Date:
December 02, 2003
Filing Date:
October 31, 1996
Export Citation:
Assignee:
Kyocera Corporation
International Classes:
H01Q21/24; H01Q1/24; H01Q1/32; H01Q11/08; H01Q13/08; H01Q21/30; H04B1/38; H04B1/3822; (IPC1-7): H01Q21/30; H01Q11/08; H01Q13/08; H01Q21/24
Domestic Patent References:
| JP7154137A | ||||
| JP6310930A | ||||
| JP2214306A | ||||
| JP1296703A | ||||
| JP7336133A | ||||
| JP7288418A | ||||
| JP5387654A |
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