Antennaless wireless device capable of operation in multiple frequency regions
The present invention refers to an antenna less wireless handheld or portable device comprising a 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. The radiating system comprising a radiating structure and at least one internal port, 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.
1. A radiation system comprising:
a ground plane layer having a perimeter within a ground plane rectangle that is the minimum-sized rectangle that encompasses the ground plane layer, the ground plane layer having a cut-out portion in a first corner such that the ground plane layer does not extend into a first corner region within the ground plane rectangle;
a radiation booster disposed in the first corner region such that an orthogonal projection of the radiation booster on a plane containing the ground plane layer is completely inside the perimeter of the ground plane rectangle and does not overlap with the ground plane layer, at least a portion of the radiation booster comprising a conductive material, wherein the radiation booster is sized to operate as a non-radiating element in the radiation system;
a port that couples a connection point of the ground plane layer to a connection point of the radiation booster across a space between the ground plane layer and the radiation booster; and
a radiofrequency system including a matching network to transform an input impedance of the radiation system, wherein the radiation booster fits within a booster box with a maximum dimension small than 1/30 of the free-space wavelength corresponding to a lowest frequency at which the radiation system operates.
2. The radiation system of claim 1 , wherein the radiation booster has a height in a direction orthogonal to the ground plane layer that is no greater than 2% of the free-space wavelength corresponding to a lowest frequency at which the radiation system operates.
3. The radiation system of claim 1 , wherein the radiation booster comprises a conductive part mounted on a polyhedral shape comprising a plurality of faces, the conductive part comprising two polygonal faces and at least one conductive strip.
4. The radiation system of claim 3 , wherein the at least one conductive strip is printed on a gap on the polyhedral shape.
5. The radiation system of claim 3 , wherein the conductive part comprises at least two conductive strips.
6. The radiation system of claim 1 , wherein the ground plane layer has a second cut-out portion in a second corner such that the ground plane layer does not extend into a second corner region within the ground plane rectangle, the radiation system further comprising:
a second radiation booster disposed in the second corner region such that an orthogonal projection of the second radiation booster on the plane containing the ground plane layer is completely inside the perimeter of the ground plane rectangle and does not overlap with the ground plane layer, at least a portion of the second radiation booster comprising a conductive material, wherein the second radiation booster is sized to operate as a non-radiating element in the radiation system; and
a second port that couples a second connection point of the ground plane layer to a connection point of the second radiation booster across a space between the ground plane layer and the second radiation booster.
7. The radiation system of claim 6 , wherein the radiation booster enables operation of the radiation system in a first frequency region and the second radiation booster enables operation of the radiation system in a second frequency region, the first and second frequency regions not overlapping.
8. The radiation system of claim 7 , wherein the first frequency region includes or is contained within the frequency range 824-960 MHz, and wherein the second frequency region includes or is contained in the frequency range 1710-2170 MHz.
9. A radiation system comprising:
a ground plane layer having a perimeter within a ground plane rectangle that is the minimum-sized rectangle that encompasses the ground plane layer, the ground plane layer having a cut-out portion in a first corner such that the ground plane layer does not extend into a first corner region within the ground plane rectangle;
a radiation booster disposed in the first corner region such that an orthogonal projection of the radiation booster on a plane containing the ground plane layer is at least partially inside the perimeter of the ground plane rectangle and does not overlap with the ground plane layer, at least a portion of the radiation booster comprising a conductive material, wherein the radiation booster is sized to operate as a non-radiating element in the radiation system;
a port that couples a connection point of the ground plane layer to a connection point of the radiation booster across a space between the ground plane layer and the radiation booster; and
a radiofrequency system including a matching network to transform an input impedance of the radiation system, wherein the radiation booster fits within a booster box with a maximum dimension small than 1/30 of the free-space wavelength corresponding to a lowest frequency at which the radiation system operates.
10. The radiation system of claim 9 , wherein the radiation booster has a height in a direction orthogonal to the ground plane layer that is no greater than 2% of the free-space wavelength corresponding to a lowest frequency at which the radiation system operates.
11. The radiation system of claim 9 , wherein the radiation booster comprises a conductive part mounted on a polyhedral shape comprising a plurality of faces, the conductive part comprising two polygonal faces and at least one conductive strip.
12. The radiation system of claim 11 , wherein the at least one conductive strip is printed on a gap on the polyhedral shape.
13. The radiation system of claim 11 , wherein the conductive part comprises at least two conductive strips.
14. The radiation system of claim 9 , wherein the ground plane layer has a second cut-out portion in a second corner such that the ground plane layer does not extend into a second corner region within the ground plane rectangle, the radiation system further comprising:
a second radiation booster disposed in the second corner region such that an orthogonal projection of the second radiation booster on the plane containing the ground plane layer is at least partially inside the perimeter of the ground plane rectangle and does not overlap with the ground plane layer, at least a portion of the second radiation booster comprising a conductive material, wherein the second radiation booster is sized to operate as a non-radiating element in the radiation system; and
a second port that couples a second connection point of the ground plane layer to a connection point of the second radiation booster across a space between the ground plane layer and the second radiation booster.
15. The radiation system of claim 14 , wherein the radiation booster enables operation of the radiation system in a first frequency region and the second radiation booster enables operation of the radiation system in a second frequency region, the first and second frequency regions not overlapping.
16. The radiation system of claim 15 , wherein the first frequency region includes or is contained within the frequency range 824-960 MHz, and wherein the second frequency region includes or is contained in the frequency range 1710-2170 MHz.