Pulsed electronic article surveillance systems

In combination, in an electronic article surveillance system having successive transmitting and receiving periods and having a preselected operating frequency:

• a) a transmitting antenna and a receiving antenna separate from said transmitting antenna and having receiving antenna output terminals;
• b) means connected to said receiving antenna output terminals for limiting voltage thereacross;
• and
• c) suppressing means separate from said transmitting antenna and connected to said receiving antenna output terminals and for suppressing the presence in said receiving antenna of signals which would be generated in the receiving antenna by the voltage limiting means.

An electronic article surveillance system, comprising:

• a) a transmitting antenna;
• b) drive means for exciting said transmitting antenna at a preselected frequency;
• c) a receiving antenna separate from and in electromagnetically coupled relation with the transmitting antenna and having receiving antenna output terminals;
• d) means connected to said receiving antenna output terminals for limiting voltage thereacross;
• and
• e) suppressing means separate from said transmitting antenna and connected to said receiving antenna output terminals for suppressing the presence of signals in said receiving antenna which are harmonics of said preselected frequency.

An electronic article surveillance system, comprising:

• a) a transmitting antenna;
• b) drive means for exciting said transmitting antenna;
• c) a receiving antenna separate from said transmitting antenna and electromagnetically coupled therewith;
• and
• d) means separate from said transmitting antenna and connected to said receiving antenna for improving the quality of transmissions from said system.