Cavity antenna mounted on a missile

Claim 2

In a propelled vehicle having a cylindrical body, such as a missile, an antenna assembly comprising: an electrically conductive cylindrical element positioned concentrically about and spaced from a portion of said cylindrical body, said cylindrical element having a diameter greater than the diameter of said portion of said cylindrical body with which it is concentric and an axial length substantially equal to one-quarter wavelength at an anticipated operating frequency of said assembly; electrically conductive means for connecting an entire circumferential edge of said cylindrical element to said portion so as to define a coaxial cavity, one end of which is completely opened and one end which is completely closed; and electrical signal feed means connected to said element and said portion at a point substantially adjacent the open end of said cavity.

Claim 3

An assembly according to claim 1 wherein said cylindrical element and at least a part of said cylindrical body form an asymmetrical dipole of large diameter relative to one wavelength at the anticipated operating frequency of said assembly.

Claim 4

In a propelled vehicle having a cylindrical body, such as a missile, an antenna assembly comprising: an electrically conductive cylindrical element positioned concentrically about and spaced from a portion of said cylindrical body, said cylindrical element having a diameter greater than the diameter of said portion of said cylindrical body with which it is concentric; electrically conductive means for connecting an entire circumferential edge of said cylindrical element to said portion so as to define a coaxial cavity, one end of which is completely opened and one end which is completely closed; and electrical signal feed means connected to said element and said portion, said feed means being connected to said cylindrical element and said portion of said cylindrical body at a plurality of substantially equally circumferential spaced points, the circumferential distance between any two adjacent points being approximately one wavelength at an anticipated operating frequency of said assembly.

Claim 5

In a propelled vehicle having a cylindrical body, such as a missile, an antenna assembly comprising: an electrically conductive cylindrical element positioned concentrically about and spaced from a portion of said cylindrical body, said cylindrical element having a diameter greater than the diameter of said portion of said cylindrical body with which it is concentric; electrically conductive means for connecting an entire circumferential edge of said cylindrical element to said portion so as to define a coaxial cavity, one end of which is completely opened and one end which is completely closed; and electrical signal feed means connected to said element and said portion, said feed means being connected to said cylindrical element and said portion of said cylindrical body at a plurality of substantially equally circumferential spaced points, the circumferential distance between any two adjacent points being approximately one wavelength at an anticipated operating frequency of said assembly.

Claim 6

In a propelled vehicle having a cylindrical body, such as a missile, an antenna assembly comprising: an electrically conductive cylindrical element positioned concentrically about and spaced from a portion of said cylindrical body, said element having a diameter greater than the diameter of said portion of said cylindrical body with which it is concentric and having an axial length substantially equal to one-quarter wavelength at the anticipated operating frequency of said assembly; electrically conductive means for connecting an entire circumferential edge of said cylindrical element to said portion so as to define a coaxial cavity, one end of which is completely opened and one end of which is completely closed; and electrical signal feed means including a plurality of leads connected to said element and said portion of said cylindrical body at points substantially adjacent the open end of said cavity, said points being equally circumferentially spaced at intervals approximately equal to one wavelength at said operating frequency.

Claim 7

In a propelled vehicle having a cylindrical body, such as a missile, an antenna assembly comprising: an electrically conductive cylindrical element positioned concentrically about and spaced from a portion of said cylindrical body, said element having a diameter greater than the diameter of said portion of said cylindrical body with which it is concentric and having an axial length substantially equal to one-quarter wavelength at the anticipated operating frequency of said assembly; electrically conductive means for connecting an entire circumferential edge of said cylindrical element to said portion so as to define a coaxial cavity, one end of which is completely opened and one end of which is completely closed; and electrical signal feed means including a plurality of leads connected to said element and said portion of said cylindrical body at points substantially adjacent the open end of said cavity, said points being equally circumferentially spaced at intervals approximately equal to one wavelength at said operating frequency.

Claim 8

In a missile having a circumference greater than a plurality of wavelengths, in a given dielectric, of a signal, an integrated antenna comprising: a cylindrical conductor concentrically positioned about a body portion of the missile and connected at one end with the missile so as to form a continuous circumferential cavity about the portion of the missile said cavity having one end completely opened and the other end completely closed; and a plurality of coaxial transmission lines each having an inner conductor and an outer cOnductor, the inner conductors each being connected with the cylindrical conductor at peripheral intervals equal at least to substantially one wavelength of the signal, in the given dielectric, and the outer conductors being connected with the missile, both the inner and outer conductors of respective coaxial lines being spaced from the one end at substantially one-quarter wavelength of the signal, in the given dielectric, so that said cylindrical conductor and missile form a high impedance cavity, the impedance being in parallel with radiation impedance existing substantially between said cylindrical conductor and missile body.

Claim 9

In a missile having a circumference greater than a plurality of wavelengths, in a given dielectric, of a signal, an integrated antenna comprising: a cylindrical conductor concentrically positioned about a body portion of the missile and connected at one end with the missile so as to form a continuous circumferential cavity about the portion of the missile said cavity having one end completely opened and the other end completely closed; and a plurality of coaxial transmission lines each having an inner conductor and an outer cOnductor, the inner conductors each being connected with the cylindrical conductor at peripheral intervals equal at least to substantially one wavelength of the signal, in the given dielectric, and the outer conductors being connected with the missile, both the inner and outer conductors of respective coaxial lines being spaced from the one end at substantially one-quarter wavelength of the signal, in the given dielectric, so that said cylindrical conductor and missile form a high impedance cavity, the impedance being in parallel with radiation impedance existing substantially between said cylindrical conductor and missile body.

Claim 10

An antenna assembly comprising: an inner electrically conductive cylindrical element having an axial length at least substantially equal to one-quarter wavelength at the anticipated operating frequency of said assembly; an outer electrically conductive cylindrical element positioned concentrically about and spaced from at least a portion of said inner cylindrical element, said outer cylindrical element having a diameter greater than the diameter of said portion of said inner cylindrical element with which it is concentric and an axial length substantially equal to one-quarter wavelength at said anticipated operating frequency; electrically conductive means for connecting an entire circumferential edge of said outer cylindrical element to said portion of said inner cylindrical element so as to define a coaxial cavity, one end of which is completely opened and one end of which is completely closed; and electrical signal feed means connected to said cylindrical elements at a point substantially adjacent the open end of said cavity.

Claim 11

An antenna assembly comprising: an inner electrically conductive cylindrical element having an axial length at least substantially equal to one-quarter wavelength at the anticipated operating frequency of said assembly; an outer electrically conductive cylindrical element positioned concentrically about and spaced from at least a portion of said inner cylindrical element, said outer cylindrical element having a diameter greater than the diameter of said portion of said inner cylindrical element with which it is concentric and an axial length substantially equal to one-quarter wavelength at said anticipated operating frequency; electrically conductive means for connecting an entire circumferential edge of said outer cylindrical element to said portion of said inner cylindrical element so as to define a coaxial cavity, one end of which is completely opened and one end of which is completely closed; and electrical signal feed means connected to said cylindrical elements at a point substantially adjacent the open end of said cavity.

Claim 12

An antenna assembly comprising: an inner electrically conductive cylindrical element; an outer electrically conductive cylindrical element positioned concentrically about and spaced from at least a portion of said inner cylindrical element, said outer cylindrical element having a diameter greater than the diameter of said portion of said inner cylindrical element with which it is concentric and an axial length substantially equal, at most, to the axial length of said inner cylindrical conductor; electrically conductive means for connecting an entire circumferential edge of said outer cylindrical element to said portion of said inner cylindrical element so as to define a coaxial cavity, one end of which is completely opened and one end of which is completely closed; and electrical signal feed means connected to said cylindrical elements, said feed means being connected to said cylindrical elements at a plurality of substantially equally circumferential spaced points, the circumferential distance between any two adjacent points being, at most, approximately one wavelength at an anticipated operating frequency of said assembly.

Claim 13

An antenna assembly comprising: an inner electrically conductive cylindrical element; an outer electrically conductive cylindrical element positioned concentrically about and spaced from at least a portion of said inner cylindrical element, said outer cylindrical element having a diameter greater than the diameter of said portion of said inner cylindrical element with which it is concentric and an axial length substantially equal, at most, to the axial length of said inner cylindrical conductor; electrically conductive means for connecting an entire circumferential edge of said outer cylindrical element to said portion of said inner cylindrical element so as to define a coaxial cavity, one end of which is completely opened and one end of which is completely closed; and electrical signal feed means connected to said cylindrical elements, said feed means being connected to said cylindrical elements at a plurality of substantially equally circumferential spaced points, the circumferential distance between any two adjacent points being, at most, approximately one wavelength at an anticipated operating frequency of said assembly.