Latvian Patent No. 14622 “Zigzag antenna, which constructively mated with the coaxial cable.” Inventors: M.Greitāns, V.Aristovs, G.Šūpols. Owner: Institute of Electronics and Computer Science. Published: 02.20.2013.
http://www.lrpv.gov.lv/sites/default/files/media/vestnesis/20130220.pdf