| Index | Thread | Archive | May-2000 | Archive | Send |
 |
  |
|
   |
|
  |
|
many aerial publications that the "coupled radiator" or "open sleeve" type feed system or whatever someone calls it was stumbled upon back in '48 by someone. In addition, Gonset sold a triband yagi back in the 50's using the coupled radiator feed scheme and more recently, HyGain was selling their Explorer tribander using the same feed method. I wonder how all that fits into the whole mix. I do seem to become confused easily however. 73, Phil, W9XX ----- Original Message ----- From: <KI7WX@aol.com> To: <johan.vandevelde@ping.be>; <Force12Talk@qth.com> Sent: Saturday, May 27, 2000 12:52 PM Subject: Re: [Force 12 Talk] Force 12 copyrights, etc. > Copyrights are different from patents, but let's leave that for lawyers. Tom > Schiller has a nice US patent which covers certain types of feed systems such > as those used by Force-12 on the C-series of tribanders. You can obtain the > entire text of this patent by going to the USPTO web site and searching there > - www.uspto.gov I've copied the abstract in below for interested parties to > save y'all some effort. > > As for infringement issues I think it's best to let Force-12 comment if they > choose to. This is their reflector after all :) > > > United States Patent 5,995,061 > Schiller November 30, 1999 > > -------------------------------------------------------------------------- ---- > -- > No loss, multi-band, adaptable antenna > > > Abstract > A no-loss, multi-band, adaptable Yagi style antenna employs a multi-element > driven cell having a center element and one or more adjacent elements on each > side of the center element. The adjacent elements of the driven cell are > electrically shorter than the center element, thereby permitting the driven > cell to be tuned to two or more frequency bands. The antenna is fed by a > feedline connected to a common feed point at the center of the center element > in the driven cell. Parasitic director elements are positioned in front of > the driven cell and are tuned to the highest band of the driven cell. > Parasitic reflector elements for one or more frequency bands are positioned > behind the driven cell, with these elements tuned to actual operating > frequencies of the antenna. The invention also provides a multi-band dipole > antenna array covering three or more frequency bands comprising a set of > dipole elements having a center element and one or more adjacent elements and > one or more adjacent elements on each side of the center element. The > adjacent elements are electrically shorter than the center element and are of > unequal lengths. The antenna is fed by a feedline connected to a common > feedpoint at the center of the center element of the set of dipole elements. > Parasitic director elements are positioned in front of the set of dipole > elements and parasitic reflector elements are positioned behind the set of > dipole elements. > > > -------------------------------------------- > Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. > Force 12 Web site: http://www.qth.com/force12 > > Submissions: send to Force12Talk@qth.com > To unsubscribe: send a blank e-mail to Force12Talk-leave@qth.com > Force12Talk Message Archive: http://www.qth.com/force12/list/force12talk > For problems with the list, contact force12@qth.com > > > -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force 12 Web site: http://www.qth.com/force12 Submissions: send to Force12Talk@qth.com To unsubscribe: send a blank e-mail to Force12Talk-leave@qth.com Force12Talk Message Archive: http://www.qth.com/force12/list/force12talk For problems with the list, contact force12@qth.com |
This Thread
|
This Author (May-2000)
|