operating conditions are first noted. It should also be noted that these measurements were made on a number of devices of the same type and the values shown are representative of those devices that were most susceptible to interference. Table 5. Summary of Interference Threshold _______________________________Measurements on Integrated Circuits________________ Before interference estimates can be made, the coupling mechanism between the SPS microwave beam and integrated circuits must be understood. This subject is effectively treated in a report by Ditton (1975) which examines the coupling of microwave energy through shielded and unshielded wires connected to various ports of an integrated circuit, including power supply connections. The maximum power coupled into an integrated circuit by a connecting wire is given by In many instances, the connecting wire is more than a 1/2 wavelength long (a wavelength is 12.2 cm at 2.45 GHz), which means that it tends to act like a long wire antenna. Thus, the wire typically has a multilobe radiation pattern with the number of lobes increasing with increasing wire length. The complexity of this lobe structure is compounded by the fact that the wire is terminated in a mismatched (and often variable) impedance. Experiments have shown that one can expect to see a distribution of received power depending on orientation of wire of
RkJQdWJsaXNoZXIy MTU5NjU0Mg==