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US 7,009,564 B2Granted
TM microstrip antenna
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsMarvin L. Ryken, Albert F. Davis
Life of this patent
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Abstract
A TM microstrip antenna designed to transmit telemetry data for use by a nine inch diameter projectile. The microstrip antenna is configured to wrap around the projectile's body without interfering with the aerodynamic design of the projectile. The TM microstrip antenna operates at 2.25 GHz with a bandwidth of ±10 MHz. Eight microstrip antenna elements equally spaced around the projectile provide for linear polarization and a quasi-omni directional radiation pattern.
Claims20
A TM microstrip antenna mounted on a projectile comprising:
- (a) a first rectangular shaped dielectric layer;
- (b) a plurality of rectangular shaped antenna elements mounted on an upper surface of said first dielectric layer, said antenna elements being aligned with one another and fabricated from copper, said antenna elements being adapted to transmit telemetry data at a frequency of approximately 2.25 GHz;
- (c) an antenna feed network mounted on a bottom surface of said first dielectric layer, said antenna feed network having a main transmission line connected to a signal input for said TM microstrip antenna, said feed network having a plurality of branch transmission lines connected to said main transmission line and each of said antenna elements, each of said branch transmission lines including a plurality of probes, one of said probes being positioned underneath one antenna element of said plurality of antenna elements to capacitively couple said one antenna element to said feed network, resulting in a linear polarization and an omni-directional radiation pattern being generated by said antenna elements of said TM microstrip antenna;
- and
- (d) a pair of identical filters integrally formed within said main transmission line, each of said pair of identical filters being tuned at a GPS frequency of approximately 1.575 GHz to provide for a minimum isolation of 50 dB.
2 more elements
A TM microstrip antenna mounted on a projectile comprising:
- (a) a first rectangular shaped dielectric layer;
- (b) a plurality of rectangular shaped antenna elements mounted on an upper surface of said first dielectric layer, said plurality of antenna elements being aligned with one another and fabricated from copper, said plurality of antenna elements being adapted to transmit telemetry data at a frequency of approximately 2.25 GHz;
- (c) each of said plurality of antenna elements including a tuning stub located, on one side of said antenna element, said tuning stub for each of said plurality of antenna elements allowing said plurality of antenna elements to be fine tuned to an operating frequency for said TM microstrip antenna;
- (d) an antenna feed network mounted on a bottom surface of said first dielectric layer, said antenna feed network having a main transmission line connected to a signal input for said TM microstrip antenna, said feed network having a plurality of branch transmission lines connected to said main transmission line and each of said antenna elements, each of said branch transmission lines including a plurality of probes, one of said probes being positioned underneath one antenna element of said plurality of antenna elements to capacitively couple said one antenna element to said feed network, resulting in a linear polarization and an omni-directional radiation pattern being generated by said antenna elements of said TM microstrip antenna;
- (e) a pair of identical filters integrally formed within said main transmission line, each of said pair of identical filters being tuned at a GPS frequency of approximately 1.575 GHz to provide for a minimum isolation of 50 dB, each of said pair of filters comprising a band stop filter;
- and
- (h) a second dielectric layer positioned below said first dielectric layer in alignment with said first dielectric layer, said second dielectric layer having a ground plane mounted on a bottom surface thereof.
4 more elements
A TM microstrip antenna mounted on a projectile comprising:
- (a) a first rectangular shaped dielectric layer;
- (b) eight rectangular shaped antenna elements mounted on an upper surface of said first dielectric layer, said eight antenna elements being aligned with one another and fabricated from copper, said eight antenna elements being adapted to transmit telemetry data at a frequency of approximately 2.25 GHz;
- (c) each of said eight antenna elements including a tuning stub located on one side of said antenna element, said tuning stub for each of said eight antenna elements allowing said eight antenna elements to be fine tuned to an operating frequency for said TM microstrip antenna;
- (d) an antenna feed network mounted on a bottom surface of said first dielectric layer, said antenna feed network having a main transmission line connected to a signal input for said TM microstrip antenna, said feed network having a plurality of branch transmission lines connected to said main transmission line and each of said eight antenna elements, each of said branch transmission lines including a plurality of probes, one of said probes being positioned underneath one antenna element of said eight antenna elements to capacitively couple said one antenna element to said feed network, resulting in a linear polarization and an omni-directional radiation pattern being generated by said antenna elements of said TM microstrip antenna;
- (e) a pair of identical band stop filters integrally formed within said main transmission line, each of said pair of band stop filters being tuned at a GPS frequency of approximately 1.575 GHz to provide for a minimum isolation of 50 dB;
- and
- (h) a second dielectric layer positioned below said first dielectric layer in alignment with said first dielectric layer, said second dielectric layer having a ground plane mounted on a bottom surface thereof.
4 more elements
Dependencies are inferred from the claim text.