Communication device and method for designing multi-antenna system thereof

Patent metadata

Field	Value
Publication number	US-9559422-B2
Application number	US-201414460377-A
Country	US
Kind code	B2
Filing date	Aug 15, 2014
Priority date	Apr 23, 2014
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

The disclosure provides a communication device. The communication device includes a ground conductor portion and a multi-antenna system. The multi-antenna system includes at least a first and a second resonant portion, each of which is disposed on the corresponding radiating edge of the ground conductor portion. Each of the resonant portions may have a loop resonant structure or may have an open-slot resonant structure, and has a resonant path. The electrically coupling portion makes the length of the resonant path less than or equal to 0.18 times the wavelength of the lowest operating frequency of the multi-antenna system, and thereby excites the corresponding radiating edge and forms a strong surface current distribution, and generates an effective radiating energy and at least one resonant mode, in which the effective radiating energy has a corresponding strongest radiation direction.

First claim

What is claimed is:

1. A communication device, comprising:
a ground conductor portion comprising at least a first radiating edge and a second radiating edge; and
a multi-antenna system, comprising at least:
a first resonant portion disposed on the first radiating edge of the ground conductor portion, the first resonant portion comprising a first electrically coupling portion and a first switch, wherein the first resonant portion has a loop resonant structure or an open-slot resonant structure, and the first resonant portion has a first resonant path, the first switch is disposed on the first resonant path, the first electrically coupling portion makes the length of the first resonant path less than or equal to 0.18 times the wavelength of the lowest operating frequency of the multi-antenna system, thereby exciting the first radiating edge to form a strong surface current distribution, and generating a first effective radiating energy and at least one first resonant mode covering at least one first operating band, the first effective radiating energy generated having a first strongest radiation direction;
a second resonant portion disposed on the second radiating edge of the ground conductor portion, the second resonant portion comprising a second electrically coupling portion and a second switch, wherein the second resonant portion has a loop resonant structure or an open-slot resonant structure, and the second resonant portion has a second resonant path, the second switch is disposed on the second resonant path, the second electrically coupling portion makes the length of the second resonant path less than or equal to 0.18 times the wavelength of the lowest operating frequency of the multi-antenna system, thereby exciting the second radiating edge to form a strong surface current distribution, and generating a second effective radiating energy and at least one second resonant mode covering at least the first operating band, the second effective radiating energy generated having a second strongest radiation direction;
a first control circuit respectively and electrically coupled to the first resonant portion and the second resonant portion through a plurality of signal lines, the first control circuit switching a signal source to electrically couple to one of the first resonant portion or the second resonant portion, and generating the first strongest radiation direction or the second strongest radiation direction, or controlling the signal source to concurrently electrically couple to the first resonant portion and the second resonant portion, and generating a third effective radiating energy having a third strongest radiation direction; and
a second control circuit respectively and electrically coupled to the first switch and the second switch through a plurality of signal lines, the second control circuit switching the first switch to a conducting state when the signal source is electrically coupled to the first resonant portion, and switching the second switch to the conducting state when the signal source is electrically coupled to the second resonant portion.

2. The communication device of claim 1 , wherein each of the first resonant portion and the second resonant portion has a loop resonant structure and a shorting point.

3. The communication device of claim 1 , wherein each of the first resonant portion and the second resonant portion has an open-slot resonant structure and a feeding metal strip.

4. The communication device of claim 3 , wherein the ground conductor portion is implemented on a surface of a dielectric substrate, and the open-slot resonant structure and the corresponding feeding metal strip are respectively disposed on different surfaces above and below the dielectric substrate.

5. The communication device of claim 1 , wherein the first electrically coupling portion or the second electrically coupling portion comprises at least one lumped capacitive element, variable capacitive element, or distributive capacitive conductor structure.

6. The communication device of claim 1 , wherein the first switch or the second switch is a diode element, a capacitive switch element, an integrated circuit switch element, or a micro-electro-mechanical system (MEMS) switch element.

7. The communication device of claim 1 , wherein the at least one first radiating edge and the second radiating edge serve as two adjacent sides of the ground conductor portion.

8. The communication device of claim 1 , wherein when the signal source is not electrically coupled to the first resonant portion, the first switch is in an open state to prevent resonance of the first resonant portion.

9. The communication device of claim 1 , wherein when the signal source is not electrically coupled to the second resonant portion, the second switch is in an open state to prevent resonance of the second resonant portion.

10. The communication device of claim 1 , wherein an included angle between the first and second strongest radiation directions is at least 30 degrees.

11. A method for designing a multi-antenna system suitable for a communication device, the method comprising:
disposing a multi-antenna system in a communication device comprising a ground conductor portion, wherein the ground conductor portion comprises at least a first radiating edge and a second radiating edge, and the multi-antenna system comprises at least a first resonant portion and a second resonant portion;
disposing the first resonant portion on the first radiating edge, wherein the first resonant portion has a loop resonant structure or an open-slot resonant structure, and the first resonant portion has a first resonant path, the first resonant portion comprising a first electrically coupling portion and a first switch, the first switch is disposed on the first resonant path, the first electrically coupling portion makes the length of the first resonant path less than or equal to 0.18 times the wavelength of the lowest operating frequency of the multi-antenna system, thereby exciting the first radiating edge to form a strong surface current distribution, and generating a first effective radiating energy and at least one first resonant mode covering at least one first operating band, and the first effective radiating energy generated has a first strongest radiation direction;
disposing the second resonant portion on the second radiating edge of the ground conductor portion, wherein the second resonant portion has a loop resonant structure or an open-slot resonant structure, and the second resonant portion has a second resonant path, the second resonant portion comprising a second electrically coupling portion and a second switch, the second switch is disposed on the second resonant path, the second electrically coupling portion makes the length of the second resonant path less than or equal to 0.18 times the wavelength of the lowest operating frequency of the multi-antenna system, thereby exciting the second radiating edge to form a strong surface current distribution, and generating a second effective radiating energy and at least one second resonant mode covering at least the first operating band, the second effective radiating energy generated having a second strongest radiation direction;
disposing a first control circuit respectively electrically coupled to the first resonant portion and the second resonant portion through a plurality of signal lines, the first control circuit switching a signal source to electrically couple to one of the first resonant portion or the second resonant portion, and generating the first strongest radiation direction or the second strongest radiation direction, or controlling the signal source to concurrently and electrically

Assignees

• Ind Tech Res Inst
• Nat Sun Yat-Sen Univ

Inventors

• Wong Kin-Lu
• Kao Yeh-Chun
• Lin Po-Wei
• Li Wei-Yu

Classifications

• H01Q21/30

  Combinations of separate antenna units operating in different wavebands and connected to a common feeder system · CPC title

• H01Q13/10

  Resonant slot antennas · CPC title

• H01Q7/00 Primary

  Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop · CPC title

• H01Q9/14

  Length of element or elements adjustable (telescopic elements H01Q1/10) · CPC title

• H01Q21/20

  the units being spaced along or adjacent to a curvilinear path {(slotted waveguide arrays H01Q21/005; circularly or helically slotted waveguides H01Q21/0062)} · CPC title