An RF signal can be radiated effectively if the linear dimension of the antenna is comparable with the wavelength of the operating frequency. In an RFID application utilizing the VLF (100 kHz – 500 ...

This document describes the principles of antenna tuning for the contactless reader IC CLRC663, MFRC630, MFRC631, SLRC610. A practical example is given to tune an ID2±10 antenna for all baud rates ...

A newly licensed amateur radio operator’s first foray into radios is likely to be a VHF or UHF radio with a manageable antenna designed for the high frequencies in these radio bands. But these radios ...

All-American type T-1 toroidal antenna coil in original package. Marked: "[Indian head logo] / All-American / Patent Appld. For / Antenna Coupler / Type T-1 / Toroid Coil / All-American Radio Corp. / ...

Marked: "De Forest Coil / Antenna / Pat. 2-17-03 / 10-11-04 / 12-15-05 / 4-22-06 / Other Patents Pending". This antenna is a plug-in unit for use with De Forest D-17 and D-12 Radiophone receivers. A ...