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