Claims
- 1. An antenna for a thin portable communications receiver, comprising:
- a conductor formed into single turn rectangular loop having a first set of two parallel opposed sides up to one-quarter wavelength in length at the operating frequency and a second set of two parallel opposed sides shorter than said first set of sides, said loop terminating in connection tabs, located symmetrically about the midpoint of one of said first set of sides, for connection to the receiver; and
- a dielectric core interposed within said loop and substantially filling said loop, with said dielectric core further forming a half-wave electric dipole symmetrical about said connection tabs at the operating frequency.
- 2. The antenna according to claim 1 wherein said conductor is flat sheet metal.
- 3. The antenna according to claim 2 wherein said metal sheet is beryllium copper.
- 4. The antenna according to claim 1 wherein said dielectric core has a substantially rectangular cross section normal to the plane of said loop.
- 5. The antenna according to claim 4 wherein the width of said dielectric core is at least the width of said conductor.
- 6. The antenna according to claim 1 wherein said dielectric core has a relative dielectric constant of from 3 to 250.
- 7. The antenna according to claim 1 wherein said predetermined operating frequency is greater than 150 MHz.
- 8. The antenna according to claim 1 wherein said antenna when operating in an incident electromagnetic wave has a predominantly magnetic field response normal to the received incident electromagnetic wave.
- 9. The antenna according to claim 1 wherein said antenna when operating in an incident electromagnetic wave has a predominantly electric field response parallel to the received incident electromagnetic wave.
- 10. The antenna according to claim 1 wherein the aspect ratio between said first set of parallel opposed sides and said second set of parallel opposed sides is at least 10 to 1.
- 11. The antenna according to claim 1, wherein said antenna is tuned to a center frequency and said center frequency is stable in the presence of a human body.
Parent Case Info
This is a continuation of application Ser. No. 179,707, filed Apr. 11, 1988, now abandoned.
US Referenced Citations (4)
Non-Patent Literature Citations (2)
Entry |
"Small Antennas", by Harold A. Wheeler published in the IEEE Transactions on Antennas and Propagation, vol. AP-23, No. 4, Jul., 1975, pp. 462-469. |
"Personal Radio Antennas" by N. H. Shepard and W. G. Chaney of G. E., Lynchburg, Va., pp. 23-31, source of the publication is unknown. |
Continuations (1)
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Number |
Date |
Country |
Parent |
179707 |
Apr 1988 |
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