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US 6,297,780 B1Granted
Mobile apparatus with plurality of antennas having different directivities
AssigneeNEC Corporation
InventorAkihiro Kirisawa
Life of this patent
Estimating the term…
Abstract
In a mobile apparatus for communication with a satellite, a plurality of antennas having different directivities from each other are provided. A selector circuit is connected between a transmitter circuit and the antennas to select and connect one of the antennas to the transmitter circuit. A control section controls the selector circuit in accordance with a reflected power detected from one of the antennas.
Claims11
A mobile apparatus for communication with a satellite comprising:
- a transmitter circuit;
- a plurality of antennas having different elevation angle directivities from each other;
- a selector circuit connected between said transmitter circuit and said antennas, for selecting and connecting one of said antennas to said transmitter circuit;
- and
- a control section, connected to said selector circuit, for controlling said selector circuit in accordance with a reflected power detected from said connected one of said antennas.
2 more elements
A mobile apparatus for communication with a satellite comprising:
- a transmitter circuit;
- a plurality of antennas having different elevation angle directivities from each other;
- a selector circuit connected between said transmitter circuit and said antennas, for selecting and connecting one of said antennas to said transmitter circuit;
- and
- a control section, connected to said selector circuit, for controlling said selector circuit in accordance with a reflected power detected from said connected one of said antennas, wherein said plurality of antennas comprise:
- a single cylindrical element;
- and
- a plurality of helical conductors wound on said cylindrical element, each of said helical conductors performing as one of said antennas,
- each of said helical conductors having different pitches from each other.
6 more elements
A mobile apparatus comprising:
- a transmitter circuit;
- a plurality of antennas having different elevation angle directivities from each other;
- a selector circuit, connected between said transmitter circuit and said antennas, for selecting and connecting said antennas to said transmitter circuit;
- a directional coupler, connected between said transmitter circuit and said selector circuit, for passing a transmitting signal from said transmitter circuit to said selector circuit and taking out a reflected power from said connected one of said antennas;
- a control section, connected between said directional coupler and said selector circuit, for controlling said selector circuit in accordance with the reflected power from said connected one of said antennas.
2 more elements
A mobile apparatus comprising:
- a transmitter circuit;
- a plurality of antennas having different elevation angle directivities from each other;
- a selector circuit, connected between said transmitter circuit and said antennas, for selecting one of the said antennas and connecting said one of said antennas to said transmitter circuit;
- a circulator, connected between said transmitter circuit and said selector circuit, for passing a transmitting signal from said transmitter circuit to said selector circuit and taking out a reflected power from said one said antennas;
- and
- a control section, connected between said circulator and said selector circuit, for controlling said selector circuit in accordance with the reflected power from said one of said antennas.
3 more elements
Dependencies are inferred from the claim text.