Low Profile Mobile Tri-Band Antenna System

• US 20080298298A1
• Filed: 11/10/2005
• Published: 12/04/2008
• Est. Priority Date: 12/01/2005
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Jeon, Soon-Ik, Jung, Young-Bae, Yun, Jae-Seung, Eom, Soon-Young, Son, Seong-Ho
• Granted Patent: US 8,462,753 B2
• Time in Patent Office: Days
• US Class Current: 370/316
• CPC Class Codes: H01Q 1/3275 mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
• CPC Class Codes: H01Q 19/19 comprising one main concave reflecting surface associated with an auxiliary reflecting surface
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 25/007 using two or more primary active elements in the focal region of a focusing device for operation on different wavebands H01Q5/22
• CPC Class Codes: H01Q 3/04 for varying one co-ordinate of the orientation
• CPC Class Codes: H01Q 5/55 for horn or waveguide antennas

Abstract

Provided is a mobile tri-band antenna system having low profile. The antenna system includes a tri-band feeding unit for dividing a satellite broadcasting signal by a signal channel in an azimuth angle and an elevation angle, and transmitting/receiving the satellite communication signal through distinguishing the satellite communication signal; a beam shaping unit for dividing the satellite broadcasting signals into a first channel signal and a second channel signal, combined power thereof through channel switching; an antenna controlling unit for driving an antenna system in an azimuth and elevation angle to direct the satellite according to the power combined second channel signal from the beam shaping unit; a first triplexer unit for outputting the power combined first channel signal to a rotary joint unit; a second triplexer unit for converting the first channel signal inputted to a downlink frequency and providing the converted first channel signal to the indoor apparatus.

Claims

1. A mobile tri-band antenna system having a dual reflecting means for receiving/transmitting a satellite communication signal from/to a free space, an uplink frequency converting means for converting the satellite communication transmitting signal to an uplink frequency, a first downlink frequency converting means for converting the satellite communication receiving signal to a downlink frequency, a first triplexing means and a second triplexing means for transmitting and receiving the satellite communication signal, a rotary joint means for connecting a rotating unit for tracking the satellite and a fixing unit for fixing the antenna system, and an indoor apparatus for controlling the antenna system by a user, the mobile tri-band antenna system comprising:

a tri-band feeding means for dividing a satellite broadcasting signal received from the dual reflecting means by a signal channel according to an azimuth angle and an elevation angle, and transmitting/receiving the satellite communication signal through distinguishing the satellite communication signal;

a beam shaping means for dividing the satellite broadcasting signals from the triband feeding means into a first channel signal and a second channel signal, and

combining power of the first channel signal and power of the second channel signal through channel switching;

an antenna controlling means for driving an antenna system according to an azimuth angle and an elevation angle to direct the satellite according to the power combined second channel signal from the beam shaping means;

a first triplexer means for outputting the power combined first channel signal from the beam shaping means to a rotary joint means; and

a second triplexer means for converting the first channel signal inputted from the rotary joint means to a downlink frequency and providing the converted first channel signal to the indoor apparatus.

2. The mobile tri-band antenna system as recited in claim 1, wherein the tri-band feeding means includes:

a feeding horn means for transmitting and receiving the satellite communication signal with the dual reflecting means;

a polarization converting means for converting a linear polarized wave signal to a circular polarized wave signal and vice versa for transmitting and receiving the satellite communication signal;

an identifying means for identifying the satellite communication signal; and

a feed array means for dividing the satellite broadcasting signal by a signal channel in a horizontal direction of an azimuth angle and a vertical direction of an elevation angle according to arrangement of a feed array element.

3. The mobile tri-band antenna system as recited in claim 1, wherein the beam shaping means includes:

a channel dividing means for dividing the satellite broadcasting signal from the tri-band feeding means into the first channel signal and the second channel signal;

a first power combining means for combining the power of the first channel signal; and

a second power combining means for combining the power of the second channel signal.

4. The mobile tri-band system as recited in claim 1, wherein the antenna controlling means includes:

a driving means for mechanically driving an antenna system in a direction of the satellite according to a horizontal direction of an azimuth angle and a vertical direction of an elevation angle;

a switching means for controlling the satellite communication transmitting signal to be turned on or off by driving the antenna system to direct the satellite through the driving means; and

a central processing means for controlling the driving means according to the second channel signal inputted from the beam shaping means.

5. The mobile tri-band antenna system as recite in claim 1, wherein the first triplexer means includes an IF low band pass filter, an IF band pass filter, and an IF amplifier for transmitting the satellite communication signal, and an IF switch disposed between the IF band pass filter and the IF amplifier and controlled by the antenna controlling means.

6. The mobile tri-band system as recited in claim 1, wherein the second triplexer means includes an IF amplifier and an IF low band pass filter for receiving the first signal channel signal, and a second downlink frequency converting means for converting the first signal channel signal to a downlink frequency before the IF amplifier.

7. The mobile tri-band system as recited in claim 2, wherein the feeding horn means further includes a stepped protruding dielectric rod inserted into a circular waveguide for impedance matching.

8. The mobile tri-band system as recited in claim 2, wherein, in the feed array means, the array elements are disposed around the feeding horn means at 90°

cycle, and a distance between the array elements is dy=dx=0.8λ

₀.

9. The mobile tri-band system as recited in claim 3, wherein the beam shaping means further includes a phase shifting means for shifting a phase of the satellite broadcasting signal from the tri-band feeding means in order to correct a phase difference of the array elements, and a phase difference made by dividing the signal channel.