Cellular telephone antenna

Communications: radio wave antennas – Antennas – Microstrip

Patent

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Details

343713, 343830, H01Q 138

Patent

active

050418386

ABSTRACT:
An planar antenna for use with a cellular telephone has a dielectric substrate with conductive coatings on its two major surfaces. A coaxial cable extends through a central aperture in the substrate with a shield of the cable connected to coating on one surface and a center conductor of the cable connected to coating on the other substrate surface. A number of shunts extend through the substrate electrically connecting the coatings on the two surfaces at points along a line that runs through the central aperture. Another shunt extends through the substrate electrically connecting the coatings on the two surfaces at a point which is not along the line of the other shunts. The position of the last shunt is non-uniformly spaced with respect to the other shunts and is selected to alter an electrical characteristic of the antenna to a desired value.

REFERENCES:
patent: 2947987 (1960-08-01), Dodington
patent: 2996713 (1961-08-01), Boyer
patent: 3735414 (1973-05-01), Rosenbluth
patent: 3914676 (1975-10-01), Jones, Jr.
patent: 4051480 (1977-09-01), Reggia et al.
patent: 4089003 (1978-05-01), Conroy
patent: 4185289 (1980-01-01), DeSantis et al.
patent: 4305078 (1981-12-01), Jones, Jr. et al.
patent: 4329689 (1982-05-01), Yee
patent: 4386357 (1983-05-01), Patton
patent: 4401988 (1983-08-01), Kaloi
patent: 4701763 (1987-10-01), Yamamoto et al.
Paper written by inventors listed on Pat. No. 4,051,480 entitled "Conformal Dielectric-Filled Edge-Slot Antennas With Inductive-Post Tuning", IEEE Transactions on Antennas and Propagation, Sep. 1979.
"Flush-Mounted Antenna for Mobile Application", Electronics, D. R. Rhodes, Mar. 1949.

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