# US 2013/0154896 A1 · Antennaless wireless device capable of operation in multiple frequency regions

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- Number: US 2013/0154896 A1
- Document ID: US20130154896A1
- Status: Published application
- Kind: A1
- Application number: 13/530,704
- Filed: 2012-06-22
- Published: 2013-06-20
- Earliest claimed: 2008-08-04
- Assignees: Fractus, S.A.
- Inventors: Jaume ANGUERA; Aurora Andujar; Carles Puente; Josep Mumbru
- Web page: https://patentgrep.com/patent/US20130154896A1

## CPC

- H01Q 5/50: Feeding or matching arrangements for broad-band or multi-band operation
- H01Q 1/243: {with built-in antennas}
- H01Q 1/48: Earthing means; Earth screens; Counterpoises
- H01Q 1/50: Structural association of antennas with earthing switches, lead-in devices or lightning protectors
- H01Q 5/00: Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements (combinations of separate active antenna units operating in different wavebands and connected to a common feeder system H01Q21/30)
- H01Q 5/335: at the feed, e.g. for impedance matching
- H01Q 5/35: using two or more simultaneously fed points
- H01Q 9/0407: {Substantially flat resonant element parallel to ground plane, e.g. patch antenna (dipole H01Q9/285; monopole H01Q9/40)}
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

The present invention refers to an antennaless wireless handheld or portable device (100) comprising: a user interface module (101), a processing module (102), a memory module (103), a communication module (104) and, a power management module (105); the communication module (104) including a radiating system (200) capable of transmitting and receiving electromagnetic wave signals in a first frequency region and in a second frequency region, wherein the highest frequency of the first frequency region is lower than the lowest frequency of the second frequency region; said radiating system (200) comprising a radiating structure (201) comprising or consisting of at least one ground plane layer (206) capable of supporting at least one radiation mode, the at least one ground plane layer (206) including at least one connection point (207); at least one radiation booster (204) to couple electromagnetic energy from/to the at least one ground plane layer (206), the/each radiation booster including a connection point (205); and at least one internal port (208), wherein the/each internal port (208) is defined between the connection point (205) of the/each radiation booster (204) and one of the at least one connection point (207) of the at least one ground plane layer (206); wherein the at least one ground plane layer (206) has associated a ground plane rectangle (450), the ground plane rectangle (450) being defined as the minimum-sized rectangle that encompasses the at least one ground plane layer (206) so that the sides of the ground plane rectangle (450) are tangent to at least one point of the at least one ground plane layer (206); the radiating system (200) further comprising a radiofrequency system (202), and an external port (203); the radiofrequency system (200) comprising a port (209) connected to each of the at least one internal port (208) of the radiating structure (201) and a port (210) connected to the external port (203) of the radiating system (200); wherein the input impedance of the radiating structure (201) at the/each internal port (208) when disconnected from the radiofrequency system (202) has an imaginary part not equal to zero for any frequency of the first frequency region; and wherein said radiofrequency system (202) modifies the impedance of the radiating structure (201), providing impedance matching to the radiating system (200) in the at least two frequency regions of operation of the radiating system.

## Claims

### Claim 1

An antennaless wireless handheld or portable device comprising:
a user interface module,
a processing module,
a memory module,
a communication module and,
a power management module;
the communication module including a radiating system capable of transmitting and receiving electromagnetic wave signals in a first frequency region and in a second frequency region, wherein the highest frequency of the first frequency region is lower than the lowest frequency of the second frequency region;
said radiating system comprising a radiating structure comprising or consisting of at least one ground plane layer capable of supporting at least one radiation mode, the at least one ground plane layer including at least one connection point; at least one radiation booster to couple electromagnetic energy from/to the at least one ground plane layer, the/each radiation booster including a connection point; and at least one internal port, wherein the/each internal port is defined between the connection point of the/each radiation booster and one of the at least one connection point of the at least one ground plane layer;
wherein the at least one ground plane layer has associated a ground plane rectangle, the ground plane rectangle being defined as the minimum-sized rectangle that encompasses the at least one ground plane layer so that the sides of the ground plane rectangle are tangent to at least one point of the at least one ground plane layer;
the radiating system further comprising a radiofrequency system, and an external port;
the radiofrequency system comprising a port connected to each of the at least one internal port of the radiating structure and a port connected to the external port of the radiating system;
wherein the input impedance of the radiating structure at the/each internal port when disconnected from the radiofrequency system has an imaginary part not equal to zero for any frequency of the first frequency region;
and wherein said radiofrequency system modifies the impedance of the radiating structure, providing impedance matching to the radiating system in the at least two frequency regions of operation of the radiating system.

### Claim 2 (depends on 1)

The antennaless wireless device of claim 1, wherein the ratio between a long side of the ground plane rectangle, and the free-space wavelength corresponding to the lowest frequency of the first frequency region is larger than 0.2.

### Claim 3 (depends on 2)

The antennaless wireless device of claim 2, wherein said ratio is smaller than 1.0.

### Claim 4 (depends on 1)

The antennaless wireless device of claim 1, wherein the/each radiation booster has a maximum size smaller than 1/50 times the free-space wavelength corresponding to the lowest frequency of the first frequency region, and wherein at least one radiation booster has a maximum size smaller than 1/30 times the free-space wavelength corresponding to the lowest frequency of the second frequency region.

### Claim 5 (depends on 4)

The antennaless wireless device of claim 4, wherein the/each radiation booster has a maximum size larger than 1/180 times the free-space wavelength corresponding to the lowest frequency of said first frequency region, and wherein at least one radiation booster has a maximum size larger than 1/120 times the free-space wavelength corresponding to the lowest frequency of the second frequency region.

### Claim 6 (depends on 1)

The antennaless wireless device of claim 1, wherein the radiating structure features at the/each internal port, when disconnected from the radiofrequency system, a first resonance frequency located above the first frequency region, and wherein for at least some of the internal ports of the radiating structure, the ratio between the first resonance frequency at a given internal port of the radiating structure when disconnected from the radiofrequency system and the highest frequency of said first frequency region is larger than 4.2.

### Claim 7 (depends on 6)

The antennaless wireless device of claim 6, wherein the first resonance frequency at an internal port is located above the first frequency region but below the second frequency region.

### Claim 8 (depends on 6)

The antennaless wireless device of claim 6, wherein the first resonance frequency at the/each internal port of the radiating structure is above the second frequency region of operation of the radiating system.

### Claim 9 (depends on 1)

The antennaless wireless device of claim 1, wherein the radiating structure includes a first radiation booster and a second radiation booster, wherein a booster box for a radiation booster is defined as being the minimum-sized parallelepiped of square or rectangular faces that completely encloses the radiation booster and wherein each one of the faces of said minimum-sized parallelepiped is tangent to at least a point of said radiation booster and each possible pair of faces of said minimum-size parallelepiped sharing an edge forms an inner angle of 90°, wherein the smallest dimension of a booster box for the first radiation booster is not smaller than 70% of the largest dimension of the booster box for the first radiation booster, and wherein the smallest dimension of a booster box for the second radiation booster is smaller than 20% of the largest dimension of the booster box for the second radiation booster.

### Claim 10 (depends on 1)

The antennaless wireless device of claim 1, wherein the at least one radiation booster comprises a conductive part which take the form of a conducting strip, a polygonal shape, a circle, an ellipse, a polyhedral shape, a cylinder, a sphere and a combination thereof, wherein the connection point of the at least one radiation booster is located substantially close to at least one of an end and a corner of said conductive part.

### Claim 11 (depends on 1)

The antennaless wireless device of claim 1, wherein the at least one radiation booster comprises a gap defined in the ground plane layer, wherein the gap is delimited by one or more segments defining a curve, wherein the connection point of the radiation booster is located at a first point along said curve and the connection point of the ground plane layer is located at a second point along said curve, said second point being different from said first point.

### Claim 12 (depends on 1)

The antennaless wireless device of claim 1, wherein a radiating structure includes a first radiation booster comprising a conductive part and a second radiation booster comprising a gap defined in the ground plane layer.

### Claim 13 (depends on 1)

The antennaless wireless device of claim 1, wherein two or more radiation boosters are arranged one on top of another forming for example a stacked configuration.

### Claim 14 (depends on 1)

The antennaless wireless device of claim 1, wherein a radiation booster is located substantially close to a short side of the ground plane rectangle and wherein the radiating structure features at the internal port associated to said radiation booster, when the radiofrequency system is disconnected, an input impedance having a capacitive component for the frequencies of the first and second frequency regions.

### Claim 15 (depends on 1)

The antennaless wireless device of claim 1, wherein a radiation booster is located substantially close to a long side of the ground plane rectangle and wherein the radiating structure features at the internal port associated to said radiation booster, when the radiofrequency system is disconnected, an input impedance having an inductive component for the frequencies of said first and second frequency regions.

### Claim 16 (depends on 1)

The antennaless wireless device of claim 1, wherein the radiating structure comprises a first radiation booster, and a second radiation booster, wherein a first internal port is defined between a connection point of the first radiation booster and the at least one connection point of the ground plane layer and wherein a second internal port is defined between a connection point of the second radiation booster and said at least one connection point of the ground plane layer.

### Claim 17 (depends on 16)

The antennaless wireless device of claim 16, wherein the first radiation booster is substantially close to a first corner of the ground plane layer and the second radiation booster is substantially close to a second corner of the ground plane layer said second corner not being the same as said first corner, wherein the first and second corners are in common with two corners of the ground plane rectangle associated to said ground plane layer and said two corners are at opposite ends of a short side of the ground plane rectangle.

### Claim 18 (depends on 16)

The antennaless wireless device of claim 16, wherein the first and second radiation boosters are substantially close to a first corner of the ground plane layer, the first corner being in common with a corner of the ground plane rectangle, wherein the first and the second radiation boosters are such that the first internal port, when the radiofrequency system is disconnected, features an input impedance having an inductive component for the frequencies of the first and second frequency regions, and the second internal port, also when the radiofrequency system is disconnected, features an input impedance having a capacitive component for the frequencies of the first and second frequency regions.

### Claim 19 (depends on 16)

The antennaless wireless device of claim 16, wherein the first radiation booster is located substantially close to a short edge of the ground plane layer and the second radiation booster is located substantially close to a long edge of the ground plane layer, wherein said short edge and said long edge are in common with a short side and a long side respectively of the ground plane rectangle and meet at a corner.

### Claim 20 (depends on 1)

The antennaless wireless device of claim 1, wherein the radiofrequency system comprises at least one matching network to transform the input impedance of the radiating structure.