Monolithic, electrically small, multi-frequency antenna

• US 3,914,767 A
• Filed: 06/11/1974
• Issued: 10/21/1975
• Est. Priority Date: 06/11/1974
• Status: Expired due to Term

• Current Assignee: Howard S. Jones Jr
• Original Assignee: Howard S. Jones Jr
• Inventors: Jones, Howard S. Jr.
• Primary Examiner(s): Lieberman, Eli
• Application Number:
  US05/478,204
• Time in Patent Office: 497 Days
• Field of Search: 343/708,725,769,770,785
• US Class Current: 343/708
• CPC Class Codes: H01Q 1/28 Adaptation for use in or on aircraft, missiles, satellites, or balloons
• CPC Class Codes: H01Q 1/281 Nose antennas
• CPC Class Codes: H01Q 13/18 the slot being backed by, or formed in boundary wall of, a resonant cavity longitudinally slotted cylinder H01Q13/12 ; Open cavity antennas

Abstract

A projectile having a telemetry system built in which requires an antenna which is structurally incorporated into the nose cone of the projectile. A dielectric material shaped to conform to the nose cone of the projectile is adapted to be part of the projectile exterior wall structure. A thin metallic coating is deposited on the entire inside surface of the dielectric nose cone and the coating is extended to cover a portion of the outside surface such as to leave the tip of the nose cone exposed, thereby defining an open end dielectric loaded radiator. A slot shaped aperture is provided in the coating and is located at the base of the nose cone so as to expose a portion of the dielectric and thereby define a slotted dielectric loaded cavity. A plurality of metallic coated holes are located circumferentially around the nose cone so as to electrically separate the open ended dielectric loaded radiator from the slotted dielectric loaded cavity. The resultant product is a multi-frequency, monolithic conical dielectric loaded cavity antenna.

Claims

1. In the projectile of the class wherein a signal is generated within a projectile to be transmitted from an antenna, the improvement comprising:

a. a dielectric material shaped to conform to the nose cone of said projectile and adapted to be part of its exterior wall structure;

b. a metallic coating deposited on the inside surface of said dielectric and extending to cover a portion of the outside surface so as to leave the tip of said nose cone exposed to define an open end dielectric loaded radiator;

c. a slot shaped aperture in said coating located at the base of said nose cone to expose a portion of said dielectric and thereby define a slotted dielectric loaded cavity; and

d. a plurality of metallic coated holes in the metallic coated portion of said nose cone circumferentially disposed to electrically separate the open end dielectric loaded radiator from the slotted dielectric loaded cavity.

2. The invention defined in claim 1 further Comprising means for connecting an input signal to said open end dielectric loaded radiator, and means for connecting a separate input signal to said slotted dielectric loaded cavity.

3. The invention defined in claim 2 further comprising a second slot shaped aperture to define a second slotted dielectric loaded cavity, and means for connecting an input signal thereto.

4. The invention defined in claim 3 further comprising a metallic coated short circuit hole associated with each of said means for connecting an input signal.