Communications: radio wave antennas – Antennas – With electrical shield
Reexamination Certificate
2005-05-17
2005-05-17
Vannucci, James (Department: 2828)
Communications: radio wave antennas
Antennas
With electrical shield
C343S744000
Reexamination Certificate
active
06894656
ABSTRACT:
A standard slow wave meander line having sections of alternating impedance relative to a conductor plate is provided with a top shield connected to the conductor plane for the purpose of lowering the resonant frequency of narrow band antennas and lowering the low frequency cutoff limit of wide band antennas due to a higher delay per unit length occasioned by the use of the top shield. The shielded meander line may be utilized as a coupling device to truncated antennas such as a whip antenna or grounded loop antenna for the purposes of loading the antenna so as to provide lower frequency performance. Since the propagation constant of the meander line structure depends upon the number of high impedance/low impedance transitions per unit length, the utilization of the top shield results in more phase shifts per unit length and thus more delay per unit length, with the symmetric double sided version having double the number of transitions per unit length. When configured to provide a miniature antenna, the utilization of the top shield both lowers the cutoff frequency and eliminates down firing typical of wireless phone antennas due to the ground plane effect. Moreover, the top shield provides a uniform low VSWR over wide bandwidths and by virtue of lowering the operating frequency solves a skip-induced blackout problem due to the lower frequencies that can now be used. Further, for frequency switched meander lines, voltage stress is reduced when using the top shield. Finally, reducing the volume requirement by over 30% permits mobile use where real estate is at a premium.
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Apostolos John T.
McKivergan Patrick
BAE Systems Information and Electronic Systems Integration Inc.
Long Daniel J.
Tendler Robert K.
Vannucci James
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