US 2002/0002037 A1Published application

Radio communication apparatus and radio communication method

OwnerHiroki Ito, Tetsuya Naruseinventors

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Abstract

A radio communication apparatus and a radio communication method are proposed. Communication can be established by switching, using communication switches 33 and 37, the first communication mode in which a first antenna unit 3 is operated with the first linear polarization characteristic while a second antenna unit 21 is operated with the second linear polarization characteristic, and the second communication mode in which the first antenna unit 3 and the second antenna unit 21 are operated with the circular polarization characteristic by supplying electric power to the first antenna unit 3 and the second antenna unit 21 by circular polarization generation means 34, 35, and 36 with the phase difference of about 90° to make the polarization to match with a ground base station and a satellite base station having different polarization at one terminal.

Claims12

Dependent claims

A radio communication apparatus, comprising:

a first antenna unit having a first linear polarization characteristic oscillating in a direction vertical to ground;
a second antenna unit having a second linear polarization characteristic oscillating in a direction orthogonal to the first linear polarization characteristic;
circular polarization generation means for converting a combination of antenna characteristics of said first antenna unit and said second antenna unit into a circular polarization characteristic by supplying electric power to said first antenna unit and said second antenna unit with a phase difference of approximately 90°;
and
communication switching means for switching a first communication mode in which said first antenna unit is operated with the first linear polarization characteristic, and said second antenna unit is operated with the second linear polarization characteristic, and a second communication mode in which said circular polarization generation means operates said first antenna unit and said second antenna unit with the circular polarization characteristic.

2 more elements

A radio communication method, comprising the steps of:

converting a combination of antenna characteristics of a first antenna unit and a second antenna unit into a circular polarization characteristic by supplying electric power to said first antenna unit and said second antenna unit with a phase difference of approximately 90°, wherein said first antenna unit has a first linear polarization characteristic oscillating in a direction vertical to ground;
and said second antenna unit has a second linear polarization characteristic oscillating in a direction orthogonal to the first linear polarization characteristic;
and
switching communication between a first communication mode in which said first antenna unit is operated with the first linear polarization characteristic, and said second antenna unit is operated with the second linear polarization characteristic, and a second communication mode in which said circular polarization generation means operates said first antenna unit and said second antenna unit with the circular polarization characteristic.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 09/819,306Filed 28 Mar 2001
Priority: JP P2000-09787930 Mar 2000
Published: 3 Jan 2002
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H01Q 21/24
Antenna arrays or systems: combinations of antenna units polarised in different directions for transmitting or receiving circularly and…
H01Q 1/242
Used in mobile communications, e.g. GSM: specially adapted for hand-held use
H01Q 3/24
Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna…
H01Q 9/0421
Substantially flat resonant element parallel to ground plane, e.g. patch antenna: with a shorting wall or a shorting pin at one end of the element