Claims
- 1. A compact planar microstrip antenna, comprising:a dielectric substrate being disposed on a conductive ground plane, said dielectric substrate having a top planar surface; said antenna having a given length; a first conductive patch placed on said top planar surface, said first conductive patch having a width, W1; said first conductive patch, having a shorted end shorted to said ground plane, being connected to a coaxial probe; a second conductive patch placed on a second portion of said top planar surface being adjacent to said first conductive patch; said second conductive patch, having a central region with a given impedance, an outer patch region and a width, W2, greater than said width, W1, being connected to said first conductive patch in proximity to said central region at a junction point opposing said shorted end of the first conductive patch; said dielectric substrate having an effective impedance value; said first conductive patch causing a reduced effective impedance at said junction point, said reduced effective impedance being lesser than said effective impedance; and said reduced effective impedance providing an antenna length, AL, shorter than said given length.
- 2. The compact planar microstrip antenna, as recited in claim 1, further comprising:said first conductive patch being rectangular; and said second conductive patch being rectangular.
- 3. The compact planar microstrip antenna, as recited in claim 2, further comprising a resonant frequency of 0.754 GHz.
- 4. The compact planar microstrip antenna, as recited in claim 3, further comprising an increase in said antenna length decreases said resonant frequency.
- 5. The compact planar microstrip antenna, as recited in claim 4, further comprising said second conductive patch having a longitudinal length, L2, being greater than a longitudinal length, L1, of said first conductive patch.
- 6. The compact planar microstrip antenna, as recited in claim 5, further comprising said antenna length being greater than said longitudinal length, L2.
- 7. The compact planar microstrip antenna, as recited in claim 6, further comprising:a ratio of said width W2/said width W1; and as said ratio increases, said antenna length, AL, decreases.
- 8. A compact planar microstrip antenna, comprising:a dielectric substrate being disposed on a conductive ground plane, said dielectric substrate having a top planar surface; said antenna having a given length; a conductive patch on said top planar surface of the ground plane, said conductive patch having a narrow portion and a wide portion; said narrow portion, having a width, W1, and a shorted end shorted to said ground plane, being connected to a coaxial probe; said wide portion, having a central region with a given impedance, an outer patch region and a width, W2, greater than said width, W1; said central region being in proximity to said narrow portion and having a junction point opposing said shorted end; said dielectric substrate having an effective impedance value; said narrow portion causing a reduced effective impedance at said junction point, said reduced effective impedance being lesser than said effective impedance; and said reduced effective impedance providing an antenna length, AL, shorter than said given length.
- 9. The compact planar microstrip antenna, as recited in claim 8, further comprising a resonant frequency of 0.754 GHz.
- 10. The compact planar microstrip antenna, as recited in claim 9, further comprising an increase in said antenna length decreases said resonant frequency.
- 11. The compact planar microstrip antenna, as recited in claim 10, further comprising said wide portion of the conductive patch having a longitudinal length, L2, being greater than a longitudinal length, L1, of said narrow portion of the conductive patch.
- 12. The compact planar microstrip antenna, as recited in claim 11, further comprising said antenna length being greater than said longitudinal length, L2.
- 13. The compact planar microstrip antenna, as recited in claim 12, further comprising:a ratio of said width W2/said width W1; and as said ratio increases, said antenna length, AL, decreases.
Parent Case Info
This application is a Continuation-In-Part of PCT/US99/15657, entitled “Compact Planar Microstrip Antenna,” which designated the United States and was filed on Jul. 12, 1999 in the United States Patent & Trademark Office as a PCT Receiving Office under the procedures of the Patent Cooperation Treaty, by the same inventors herein. This Continuation-In-Part is being filed under 35 USC §120 and 35 USC §365, 37 CFR §1.53, and MPEP §1895 and priority from that application is claimed.
GOVERNMENT INTEREST
The invention described herein may be manufactured, used, imported, sold, and licensed by or for the Government of The United States of America without the payment to me of any royalty thereon.
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Kind |
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A |
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Jul 1999 |
A |
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Entry |
J.S. McLean, “A Re-Examination of the Fundamental Limits on the Radiation Q of Electrically Small Anenna”, IEEE trans, Anrenna Propagation, vol. 44, pp. 672-676, May 1996. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
PCT/US99/15657 |
Jul 1999 |
US |
Child |
09/663979 |
|
US |