Abstract: An RF transponder comprises a transponder integrated circuit, an antenna connected to the transponder integrated circuit, and at least one parasitic element adapted to interact electrically with the antenna and thereby affect antenna impedance. The orientation of the parasitic element with respect to the antenna is selected to achieve a desired operational frequency band for the RF transponder. Specifically, the spacing between the antenna and the parasitic element is selected to achieve the desired operational frequency band. For example, a first selected spacing may enable an operational frequency band suitable for a first geographic region (e.g., the United States), a second selected spacing may enable an operational frequency band suitable for a second geographic region (e.g., Europe), and a third selected spacing may enable an operational frequency band suitable for a third geographic region (e.g., Japan).

Abstract: A system useful in providing communications with automatic data collection (ADC) devices employs an antenna located in a potentially hazardous environment, a radio circuit located in a non-hazardous environment, and a coupling apparatus to provide an interface between the antenna and the radio circuit that prevents electrical discharges from occurring in the potentially hazardous environment.

Abstract: Field Configurable Radiation Antenna Device for fixed dipole antenna comprising of a hollow tube and at least one pair of directional vanes is described. The beam direction of the antenna can be changed by operationally connecting multiples pairs of directional vanes to the hollow tube and by rotating the directional vanes relatively outer peripheral surface of the hollow tube. Such adjustments allow the user to tune the antenna to meet new or unforeseen coverage issues.

Abstract: An adjustable reflector system for fixed dipole antenna comprising of reflector and several supporting devices is described. The beam direction of the antenna can be changed by rotating the reflector about the Y-axis and/or adjusting the reflector about X axis and Z-axis. Such adjustments allow the user to fine tune the antenna to meet new or unforeseen coverage issues. The plurality of the of the reflector's shapes is disclosed (flat, curved, etc.).

Abstract: Field Configurable Radiation Antenna Device for fixed dipole antenna comprising of a hollow tube and at least one pair of directional vanes is described. The beam direction of the antenna can be changed by operationally connecting multiples pairs of directional vanes to the hollow tube and by rotating the directional vanes relatively outer peripheral surface of the hollow tube. Such adjustments allow the user to tune the antenna to meet new or unforeseen coverage issues.

Abstract: An adjustable reflector system for fixed dipole antenna comprising of reflector and several supporting devices is described. The beam direction of the antenna can be changed by rotating the reflector about the Y-axis and/or adjusting the reflector about X axis and Z-axis. Such adjustments allow the user to fine tune the antenna to meet new or unforeseen coverage issues. The plurality of the of the reflector's shapes is disclosed (flat, curved, etc.).

Abstract: A zero loss bias “T” is provided for use in an RF receiver front end in order to bias a received RF signal with a DC current. The zero loss bias “T” permits a DC current to be introduced into an RF signal path of a filter having filter characteristics sufficient to pass frequencies only in a desired passband without associated losses to the RF signal. The filter may be provided by an LC filter having a ground coupling point. DC current is coupled to the RF signal path of the filter via the ground coupling point.