Abstract: A system and method of wireless communication, in which both OOK and FSK modulation transceivers are used for communication among participating devices. On-Off Key (“OOK”) may be used to awaken a communication device, establish a communication channel, and handle transmission and reception of the control signal. In doing so, communication devices operating according to the invention may use less power than conventional communication devices. Once certain initial data is exchanged between communication devices, Frequency Shift Keying (“FSK”) may be used to provide the ability for many users to communicate in a more secure fashion, so that sensitive information, such as voice and data, may be transmitted between communication devices. In this manner, the privacy of data and voice signals may be more securely protected and transmitted by the FSK modulated signal.

Abstract: A planar antenna including a radiating plate, a ground plate and a support with the radiating plate being dimensioned according to the formula L>L/2>W, where L and W are the length and width of said radiating plate, respectively. The support serves to maintain the radiating plate and the ground plate at a certain distance from each other in a substantially parallel orientation. The length of the radiating plate is approximately half of the wavelength at the operating frequency of the antenna. An air layer substrate fills in the space between the radiating plate and the ground plate. The foregoing configuration help produce an antenna with small size and high gain suitable for communication devices requiring narrow bandwidth.