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 Title: |
US4504834:
Coaxial dipole antenna with extended effective aperture
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Garay, Oscar M.; N. Lauderdale, FL
Siwiak, Kazimierz; Sunrise, FL
Balzano, Quirino; Plantation, FL
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| Assignee: |
Motorola, Inc., Schaumburg, IL
other patents from MOTOROLA, INC. (386735) (approx. 18,357)
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| Published / Filed: |
1985-03-12
/ 1982-12-22
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| Application Number: |
US1982000452167
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| IPC Code: |
Advanced:
H01Q 9/16;
H01Q 9/32;
Core:
H01Q 9/04;
IPC-7:
H01Q 9/16;
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| U.S. Class: |
Current:
343/749;
343/792;
343/802;
Original:
343/749;
343/792;
343/802;
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| Field of Search: |
343/790-794,745,750,802,807,702,822,825,828,900,895,722,749,752,820,821,850,859,860,865,898,899,904,905
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| Priority Number: |
| 1982-12-22 |
US1982000452167 |
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| Abstract: |
A coaxial dipole antenna includes a first radiator which is approximately one quarter wavelength long. A second radiator exhibits length less than one quarter wave length and is coupled to the feed port by a reactive element which has an electrical reactance which is insufficient to increase the electrical length of the second radiator to one quarter of the wavelength. The length of a dipole antenna is substantially shortened while an effective aperture of one half wavelength is maintained by causing a portion of the transceiver housing to radiate in phase with the antenna.
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| Attorney, Agent or Firm: |
Miller, Jerry A. ;
Gillman, James W. ;
Roney, Edward M. ;
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| Primary / Asst. Examiners: |
Lieberman, Eli; Wimer, Michael C.
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| Maintenance Status: |
E3 Expired Check current status
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Designated Country: |
AU DK EP JP NO CH DE FR GB LI NL SE
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| Family: |
Show 13 known family members
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First Claim:
Show all 14 claims |
What is claimed is:
1. A wide bandwidth shortened dipole antenna for use with portable transceivers, comprising:
- a feed port including a first and a second input terminal;
- a first radiator coupled at one end to said first input terminal and extending outward from said feed port in a first direction, said first radiator exhibiting electrical length of approximately one quarter of a predetermined wavelength;
- a sleeve radiator extending outward from said feed port in a direction substantially diametrically opposed to said first direction and exhibiting electrical length less than one quarter of said wavelength;
- a conductor physically longer than said sleeve radiator with a portion of said conductor disposed within said sleeve radiator, said conductor being electrically attached to said second input terminal, said conductor having a predetermined capacitance between said conductor and said sleeve radiator for extending the antenna's effective radiating aperture by exciting in-phase radiation by said conductor; and
- a reactive element coupling the end of said sleeve radiator closest to said feed port with said second input terminal, and having an electrical reactance sufficient to increase the electrical length of said sleeve radiator to one quarter of said wavelength.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 54 U.S. patent(s) that reference this one
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