초록 ▼

This invention discloses a small slot antenna incorporated within a flat circuit board and having a three dimension omni-directional radiation pattern. In one embodiment, the antenna is formed as an L shaped slot along two edges of the circuit board of a miniature radio transceiver. The antenna is i

This invention discloses a small slot antenna incorporated within a flat circuit board and having a three dimension omni-directional radiation pattern. In one embodiment, the antenna is formed as an L shaped slot along two edges of the circuit board of a miniature radio transceiver. The antenna is ideally suited for use in applications where radio frequency inventory tags (operating in the high VHF to low UHF frequency ranges of 400 to 500 mHz) are associated with items for which a high level of inventory control is required. It is important that such tags be able to communicate with vertical and horizontal polarized signals with reasonable gain. This invention features a low cost for manufacture and has application in radio communications in general wherever there is a requirement for a small transceiver with an integrated, orientation insensitive antenna.

대표청구항 ▼

[ We claim:] [1.] A combination omni-directional slot antenna and electronic circuitry comprising:a circuit board having a first selected dimension and a second selected dimension substantially perpendicular to said first dimension;electronic circuitry mounted to said circuit board, said electronic

[ We claim:] [1.] A combination omni-directional slot antenna and electronic circuitry comprising:a circuit board having a first selected dimension and a second selected dimension substantially perpendicular to said first dimension;electronic circuitry mounted to said circuit board, said electronic circuitry including at least one of receiving and transmitting circuitry and a first impedance matching network;a first slot antenna arm formed in said circuit board parallel to said first dimension;a second slot antenna arm formed in said circuit board parallel to said second dimension, one end of said first slot antenna arm joined to a selected location of said second slot antenna arm such that said first slot antenna arm is substantially perpendicular to said second slot antenna arm and forms said first omni-directional slot antenna, said first impedance matching network connected between said first omni-directional slot antenna and said at least one of said receiving and transmitting circuitry; andan antenna ground plane formed on said circuit board and surrounding both said first and second slot antenna arms.