Claims
- 1. An antenna apparatus operable at a first frequency and a second frequency, the antenna apparatus comprising:a dielectric material; a slot antenna defined a conductive strip disposed on a top surface of a first portion of the dielectric material to form a substantially rectangular slot, the slot antenna being operable at a first frequency with the slot having an electrical length of about ⅛ of a wavelength of the first frequency; and an antenna element disposed on a second portion of the dielectric material, the antenna element is operable at a second frequency; and the conductive strip having a ground connection at one end of the slot antenna and near an opposite end of the conductive strip having a feed point coupled to the antenna element, wherein the electrical length from the ground connection to the feed point is about ¼ of a wavelength of the first frequency.
- 2. An antenna apparatus according to claim 1, wherein a portion of the antenna element is arranged in a coil configuration.
- 3. An antenna apparatus according to claim 1, wherein the coil configuration consists of a conductive strip wrapped around the second portion of the dielectric material.
- 4. An antenna apparatus according to claim 1, wherein the coil configuration consists of two sets of conductive strips disposed on opposing surfaces of the second portion of the dielectric material and connected together through the dielectric material by vias to form a coil winding.
- 5. An antenna apparatus according to claim 1, further comprising a microstrip feed-line disposed on a bottom surface of the dielectric material, opposing and below the slot antenna and being perpendicular to a long axis thereof.
- 6. An antenna apparatus according to claim 5, wherein the microstrip feed-line couples energy to the slot antenna near the open-end thereof.
- 7. An antenna apparatus according to claim 5, wherein the microstrip feed-line includes a tuning portion extending parallel to the long axis of the slot antenna.
- 8. An antenna apparatus operable at a first frequency and a second frequency, the antenna apparatus comprising:a dielectric material; an open-ended slot antenna defined by a U-shaped conductive strip disposed on a top surface of a first portion of a dielectric material to form a substantially rectangular slot, the slot antenna being operable at a first frequency with the slot having an electrical length of about ⅛ of a wavelength of the first frequency; an antenna element disposed on a second portion of the dielectric material, the antenna element is operable at a second frequency, and the conductive strip having a ground connection at one end and near an opposite end of the conductive strip having a feed point coupled to the antenna element, wherein the electrical length from the ground connection to the feed point is about ¼ of a wavelength of the first frequency, the ground connection and feed point being located near an open-end of the slot antenna; and an excitation port electromagnetically coupled to both the slot antenna and the antenna element.
- 9. An antenna apparatus according to claim 8, wherein a portion of the antenna element is arranged in a coil configuration.
- 10. An antenna apparatus according to claim 8, wherein the coil configuration consists of a conductive strip wrapped around the second portion of the dielectric material.
- 11. An antenna apparatus according to claim 8, wherein the coil configuration consists of two sets of conductive strips disposed on opposing surfaces of the second portion of the dielectric material and connected together through the dielectric material by vias to form a coil winding.
- 12. An antenna apparatus according to claim 8, further comprising a microstrip feed-line disposed on a bottom surface of the dielectric material, opposing and crossing below the slot antenna and being perpendicular to a long axis thereof.
- 13. An antenna apparatus according to claim 12, wherein the microstrip feed-line couples energy to the slot antenna near the open-end thereof.
- 14. An antenna apparatus according to claim 12, wherein the microstrip feed-line includes a tuning portion extending at least partially parallel to the long axis of the slot antenna, the microstrip feed-line having a shape selected from one of the group of a “L” shape, a “C” shape, and a “T” shape.
- 15. A multi-band radiotelephone including an antenna apparatus operable at a first frequency and a second frequency, the antenna apparatus comprising:a dielectric material; an open-ended slot antenna defined by a U-shaped conductive strip disposed on a top surface of a first portion of a dielectric material to form a substantially rectangular slot, the slot antenna being operable at a first frequency with the slot having an electrical length of about ⅛ of a wavelength of the first frequency; a coil antenna element disposed on a second portion of the dielectric material, the antenna element is operable at a second frequency, and the conductive strip having a ground connection at one end and near an opposite end of the conductive strip having a feed point coupled to the antenna element, wherein the electrical length from the ground connection to the feed point is about ¼ of a wavelength of the first frequency, the ground connection and feed point being located near an open-end of the slot antenna; and an excitation port electromagnetically coupled to both the open-ended slot antenna and the coil antenna element.
- 16. An antenna apparatus according to claim 15, wherein the coil configuration consists of two sets of conductive strips disposed on opposing surfaces of the second portion of the dielectric material and connected together through the dielectric material by vias to form a coil winding.
- 17. An antenna apparatus according to claim 15, wherein the excitation port includes a microstrip feed-line disposed on a bottom surface of the dielectric material, opposing and below the slot antenna and perpendicular to a long axis thereof.
- 18. An antenna apparatus according to claim 17, wherein the microstrip feed-line couples energy to the slot antenna near the open-end thereof.
- 19. An antenna apparatus according to claim 17, wherein the microstrip feed-line includes a tuning portion extending at least partially parallel to the long axis of the slot antenna.
- 20. An antenna apparatus according to claim 17, further comprising additional conductors disposed on the bottom surface of the dielectric material, the additional conductors being coupled across the slot, thereby causing the antenna to be radiant at more than one frequency band.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is related to U.S. patent application, Ser. No. 9/408,672 by inventors Nguyen, Kwan and Pieper. The related application is assigned to the assignee of the present application, and are hereby incorporated herein in its entirety by this reference thereto.
US Referenced Citations (15)