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Keep an eye on radiator for leaks in and around patch area. Patent US5. 40. 00. Microstrip patch antenna. This invention was made with Government support under Contract No. DAAH0. 1- 9. 1- C- A0. Department of the Army. The Government has certain rights in this invention. BACKGROUND OF THE INVENTIONThis invention relates to patch antennas and more particularly to directional patch antennas wherein multiple patch radiators are used to control the direction of a beam of radio frequency (RF) energy from the antenna. In missile applications, antennas are often required to be mounted conformally with the generally cylindrical shape of a missile. Antennas which adapt easily to conformal mounting usually produce a beam of RF energy having a main lobe directed normally (or broadside to) the missile. In some applications, the required direction of the main lobe of the beam of RF energy is in a direction along an axis of the missile. To provide the latter, known patch antennas either include elements which are parasitically fed or corporate feeds to provide the RF energy to each patch element. A corporate feed includes components that occupy critical area internal to the missile. The mass and volume of all components within the missile are critical to the performance of the missile and any decrease in the size and number of components is highly desirable. SUMMARY OF THE INVENTIONWith the foregoing background in mind, it is an object of this invention to provide a patch antenna easily mounted on a side of a missile while providing a beam of RF energy having a main lobe along the axis of the missile. A patch radiator antenna is described including a sheet of conductive material and a dielectric substrate. Try the new Google Patents. Slot coupled, polarized, egg-crate radiator: US6778144: Jul 2, 2002: Aug 17, 2004. Another object of this invention is to provide a patch antenna with less components. The foregoing and other objects of this inventions are met generally by a patch radiator antenna including a sheet of conductive material and a dielectric substrate having a first and second surface, the sheet of conductive material disposed upon the first surface of the dielectric substrate. The patch radiator antenna further includes a plurality of patch radiator elements disposed upon the second surface of the dielectric substrate, each one of the plurality of patch radiator elements having sides with a width and a length. The plurality of patch radiator elements include a first patch radiator element having a feed probe to couple the first patch radiator element to an RF signal source and at least one second patch radiator element including a microstrip feed along the width of the patch radiator element, the at least one second patch radiator element disposed fore of the first patch radiator element. The patch radiator antenna further includes a strip conductor having a first end and a second end, the first end connected to the microstrip feed and the second end connected along the length of the first patch radiator element. With such an arrangement, a corporate feed for each patch radiator element is eliminated, thus reducing feed line radiation. In accordance with another aspect of the present invention, a patch radiator antenna includes a first patch radiator having a pair of edges and a technique for providing an image patch radiator element in front of the first patch radiator for providing a desired end fire excitation. The technique includes a second patch radiator having a microstrip feed, the second patch radiator disposed fore of the first patch radiator and a third patch radiator having a microstrip feed, the third patch radiator also disposed fore of the first patch radiator. The technique includes coupling a portion of RF energy propagating therethrough between the first patch radiator and the second patch radiator and between the first patch radiator and the third patch radiator including a first strip conductor having a first end and a second end, the first end connected to the first patch radiator along one of the edges and the second end connected to the microstrip feed of the second patch radiator and a second strip conductor having a first end and a second end, the first end connected to the first patch radiator along a different one of the edges and the second end connected to the microstrip feed of the third patch radiator. With such an arrangement, an apparent image patch is provided to simulate a two element linear array to provide the desired end fire directivity. When using two patch radiator elements disposed juxtapositional with each other to provide a linear array, such an arrangement produced excessive mutual coupling which inhibited the required directivity. The above described arrangement provides the required directivity by reducing mutual coupling among adjacent patch radiator elements and with less feed lines required, reduces feed line radiation. BRIEF DESCRIPTION OF THE DRAWINGFor a more complete understanding of this invention, reference is now made to the following description of the accompanying drawings, wherein: FIG. FIG. 2 is a plan view of the patch radiator antenna according to the invention; FIG. FIG. 3. A is a plan view of a transmit and a receive patch radiator antenna according to the invention disposed on a common membrane; FIG. FIG. 4 taken along the line 4. A- -4. A; and. FIGS. A, 5. B, and 5. C are a sketch of relative signal strength about the axis of a missile provided by the patch radiator antennas, respectively, according to the invention. DESCRIPTION OF THE PREFERRED EMBODIMENTSReferring now to FIG. IR) dome 1. 02 is mounted. The IR dome 1. 02 protects electronics (not shown) mounted behind the IR dome 1. Also provided behind the IR dome 1. IR dome 1. 02 with a patch radiator antenna 1. C- band, and a patch radiator antenna 1. C- band, disposed about the truncated conic ring 1. As described further hereinafter, the patch radiator antenna 1. RF) energy in the direction forward of the missile 1. In the present application, the patch radiator antenna 1. It should be appreciated that the patch radiator antenna 1. The patch radiator antenna 1. RF energy is achieved. Referring now to FIG. The patch radiator elements 1. The patch radiator element (herein also referred to as a patch) 1. Further, it will be observed that the patch 1. The coaxial line 2. RF energy (i. e. The outer shield of the coaxial transmission line is connected to a conductive sheet (i. It should be appreciated that the location of the connection of the coaxial line 2. It should be appreciated that a patch has a constant impedance along the width W of the patch, but a changing impedance along the length L of the patch. Along an edge 2. 6 having a length L of the patch 1. The location of a connection point along the length of the patch 1. Thus, the distance F being the distance from the edge 2. In the present application, the distance F is approximately 0. RF energy propagating therethrough. The patch radiator elements 1. L here of approximately 0. RF energy propagating therethrough and a width W of approximately 0. RF energy propagating therethrough. The patch radiator antenna 1. The strip conductor 3. D2, here approximately 0. RF energy propagating therethrough and a length . The first end of the strip conductor 3. D1, here approximately 0. RF energy propagating therethrough, from a corner of the patch 1. The latter controls the impedance of the connection point as described hereinbefore and is selected to match the impedance of the strip conductor 3. The patch 1. 4 and the patch 1. S2, here approximately 0. RF energy propagating therethrough, as shown. The patch 1. 4 and the patch 1. S1, here approximately 0. RF energy propagating therethrough, as shown. The second end of the strip conductor 3. The edge 3. 2 includes a notch 3. D3, here approximately 0. RF energy propagating therethrough, and a width D4, here approximately 0. RF energy propagating therethrough. As described hereinabove, the patch 1. W of the patch, but a changing impedance along the length L of the patch 1. By connecting the end of the strip conductor 3. It should be appreciated that the patch 1. Suffice it to say that patch 1. With the above described arrangement, patch 1. In a transmit mode, an RF signal is fed to the coaxial line 2. RF signal is radiated from the patch 1. Another portion of the RF signal is coupled to the patch 1. RF signal is radiated from the patch 1. Still another portion of the RF signal is coupled to the patch 1. RF signal is radiated from the patch 1. By positioning the connection of the strip conductors 3. RF signal is coupled from the patch 1. Alternatively, by changing the position of the connection of the strip conductors 3. RF energy fed to respective patches. It was observed that if the strip conductors 3. To provide the proper directivity, the length . The latter provides an image element in front of the patch 1. RF signal having equal amplitude and a - 9. With the above described arrangement, the effects of mutual coupling caused by two patches in close proximity to each other are decreased as when a patch is located directly in front of the patch 1. Referring now to FIG. Referring now to FIGS. A, 5. B and 5. C, a measured pattern for the patch radiator antenna 1. FIG. 5. A and a measured pattern for the patch radiator antenna 1. FIG. It should be appreciated the patterns as shown in FIGS. A, 5. B and 5. C are about the axis of the missile 1. FIG. 1) along the elevation (EL) axis and the azimuth (AZ) axis as indicated. As shown, the patch radiator antenna 1. Bi. 5. C, the combined patterns have a resultant two way on axis gain of greater than 9 d. Bi with broad symmetric coverage over a 4. The VSWR is less than 1. MHz. Variations to the patch radiator antenna 1. Table I shows the varying parameter values and the difference from the nominal design. All other parameters remained the same as described above. However, antenna configuration (Ck) No. It was also observed that tuning frequency was primarily a function of patch radiator length and that cross- coupling isolation in all iterations is greater than 2. Referring now to FIGS. A and 4, the patch radiator antenna 1. The truncated cone 1. The patch radiator antenna 1. The dielectric substrates 2.
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