Antenna apparatus, and associated methodology, for a multi-band radio device
Antenna apparatus, and an associated methodology, for a multi-frequency-band-capable radio device, such as a quad-band mobile station. The antenna apparatus forms a hybrid strip antenna having a pair of resonant elements. A first resonant element forms a peripheral loop extending about the periphery of a substrate. A meander line extends along a portion of the peripheral loop. And, second resonant element is formed of an L-shaped strip. The peripheral loop is resonant at a set of frequencies, and the L-shaped strip is resonant at a single frequency. Through appropriate selection of the lengths of the resonant elements, the frequencies at which the elements are resonant are controlled.
1. A hybrid strip antenna for a communication device operable at a first frequency band and at a second frequency band, said second frequency band being higher in frequency than said first frequency band, said hybrid strip antenna embodied upon a substrate, and said hybrid strip antenna comprising:
a first radiation element formed of a closed loop on the substrate and defining an interior area within the closed loop, the closed loop including a portion forming a meander line, the closed loop configured to be resonant within said first frequency band and the meander line electrical length being resonant at said second frequency band; and
a second radiation element formed of a strip coupled to said first radiation element, and lying within the interior area defined by said closed loop forming said first radiation element, the strip forming the second radiation element and being configured to cause said second radiation element to be resonant within at least a portion of said second frequency band.
2. The hybrid strip antenna of claim 1 wherein the closed loop forming said first radiation element extends about a periphery of the substrate.
3. The hybrid strip antenna of claim 2 wherein the substrate comprises a first peripheral side, a second peripheral side, a third peripheral side, and a fourth peripheral side, and wherein the closed loop extends along the first, second, third, and fourth peripheral sides, respectively.
4. The hybrid strip antenna of claim 1 wherein the closed loop is of an electrical length, including said meander line electrical length, that is determinative of said first frequency band.
5. The hybrid strip antenna of claim 1 wherein the first frequency band includes 800 MHz.
6. The hybrid strip antenna of claim 1 wherein the second frequency band comprises 1800 MHz.
7. The hybrid strip antenna of claim 1 wherein the first frequency band includes 900 MHz.
8. The hybrid strip antenna of claim 1 wherein the second frequency band comprises 1900 MHz.
9. The hybrid strip antenna of claim 1 wherein the second frequency band includes 1800 MHz.
10. The hybrid strip antenna of claim 1 wherein the second frequency band includes 1900 MHz.
11. The hybrid strip antenna of claim 1 wherein said second radiation element further comprises an L-shaped conductor.
12. The hybrid strip antenna of claim 1 wherein the first radiation element closed loop further comprises first, second, third, and fourth loop sides, each respectively adjacent the next, and wherein said hybrid strip antenna further comprises an antenna feed point electrically connected to said first loop side and said third loop side further comprises said meander line.
13. A method for transceiving signal energy at a radio device operable at a first frequency band and at a second frequency band, said second frequency band being higher in frequency than said first frequency band, said method comprising the operations of:
forming a first radiation element about a periphery of a substrate, the first radiation element defining a closed loop that defines an interior area within the closed loop, the closed loop including a portion forming a meander line, the closed loop configured to resonate within said first frequency band and the meander line electrical length configured to resonate within said second frequency band;
forming a second radiation element upon an area of the substrate within the closed loop extending about the periphery of the substrate and coupling the second radiation element to the first radiation element at a feed point, the second radiating element defining a strip and being configured to resonate within said second frequency band; and
transducing the signal energy within any of said first and second higher frequency bands at the first and second radiation elements.
14. The method of claim 13 further comprising the operation of connecting the first antenna element and the second antenna element to the radio device.
15. A hybrid strip antenna for a multi-band-capable mobile station, said hybrid strip antenna comprising:
a substrate positionable within the mobile station device;
a radiation loop disposed about a periphery of the substrate, said radiation loop being a closed loop, a portion of which includes a meander line along a portion thereof, said radiation loop resonant at a first frequency band, and the meander line thereof having an electrical length resonant at a second frequency band, said second frequency band being higher in frequency than said first frequency band; and
a radiation L-shaped strip disposed on the substrate within an interior area defined by said radiation loop, said radiation L-shaped strip resonant within at least a portion of said second frequency band.
16. The hybrid strip antenna of claim 15 wherein the first radiation closed loop further comprises first, second, third, and fourth loop sides, each respectively adjacent the next, and wherein said hybrid strip antenna further comprises an antenna feed point electrically connected to said first loop side and said third loop side further comprises said meander line.
17. The hybrid strip antenna of claim 15 wherein the closed loop is of an electrical length, including said meander line electrical length, that is determinative of said first frequency band.