05198826 is referenced by 65 patents and cites 8 patents.

A wide-band loop antenna consists of a main loop antenna conductor and a sub-loop antenna conductor. The main loop antenna conductor is provided on a dielectric plate to extend from one terminal of a pair of feed terminals to another one of the terminals so as to form a one-turn open loop. The loop antenna conductor is provided on the dielectric plate so as to extend along the main antenna conductor to provide a one-turn open loop and is connected to the pair of feed terminals to constitute a synthesized antenna together with the main antenna conductor. Short-circuting conductors are provided to connect the main antenna conductor with the sub-antenna conductor for shifting a resonance frequency of the synthesized antenna outside the operating band to obtain a wide-band frequency characteristic. In a modification, the sub-antenna conductor forms a closed loop serving as a parasitic antenna which improves an impedance characteristic of the main antenna conductor.

Title
Wide-band loop antenna with outer and inner loop conductors
Application Number
7/581893
Publication Number
5198826
Application Date
September 13, 1990
Publication Date
March 30, 1993
Inventor
Michiaki Ito
Nogaoka
JP
Agent
Woodcock Washburn Kurtz Mackiewicz & Norris
Assignee
Nippon Sheet Glass
JP
IPC
H01Q 21/00
H01Q 1/38
View Original Source