Patent ID: 7355553
Filing Date: 2008-04-08
Classification: H01Q

Abstract:
1. A microstrip antenna adapted for use on a projectile comprising: (a) a first dielectric layer operating as a protective layer for said microstrip antenna wherein said first dielectric layer is positioned around an outer surface of said projectile; (b) a second dielectric layer positioned below said first dielectric layer around the outer surface of said projectile, said second dielectric layer having an upper surface and a lower surface; (c) a pair of rectangular shaped quarter wavelength antenna elements mounted on the upper surface of said second dielectric layer, one of said pair of quarter wavelength antenna elements being rotated one hundred eighty degrees from the other of said pair of quarter wavelength antenna elements to produce a quasi omni-directional radiation pattern with linear polarization, said quarter wavelength antenna elements of said microstrip antenna having a signal output and an operating frequency of approximately 425 MHz ±375 KHz; (d) a power divider and corporate feed network mounted on the lower surface of second dielectric layer, said power divider and corporate feed network being connected to the signal output of each of said quarter wavelength antenna elements to receiver a pair of RF equivalent electrical signal from said quarter wavelength antenna elements, said power divider and corporate feed network first dividing equally and then adding together said RF equivalent electrical signals to produce a pair of equal amplitude electrical signals; and (e) said power divider and corporate feed network including a pair of resistors which insure isolation between two electrical signal outputs from said microstrip antenna.