third means for providing a magnetic field in said substrate between said microstrip lines and said ground such that signals are coupled between {HEAD ~ said microstrip lines} in a particular direction, wherein said third means includes a magnet disposed on said first surface of said substrate over a resonator circuit connecting said {TAIL ~ microstrip lines}, and a pole piece disposed on said second surface of said substrate beneath said ground 
third means for providing a magnetic field in said substrate between said microstrip lines and said ground such that signals are coupled between { HEAD ~ said microstrip lines } in a particular direction , wherein said third means includes a magnet disposed on said first surface of said substrate over a resonator circuit connecting said { TAIL ~ microstrip lines } , and a pole piece disposed on said second surface of said substrate beneath said ground
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH