Spiral Coil Loaded Short Wire Antenna
AssigneeBadger Meter, Inc.
InventorJin Hao
Life of this patent
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Abstract
A antenna (10) comprises a straight stem portion (11) and a spiral coiled portion (12) for providing the necessary length, but being compact enough for assembly in a pit tube (23) of a transmitter assembly (20) for subsurface enclosures for fluid meters.
Claims14
An antenna comprising an elongated member having a total length of approximately 0.277λ, where λ corresponds to a frequency, f, in a range from about 450 Mhz to about 470 Mhz, the elongated member having a straight stem part comprising about 20% of the total length and a coiled upper part of about 80% of the total length, the upper part being coiled in a spiral pattern.
An assembly for positioning in a subsurface enclosure for transmitting radio signals carrying meter data information, the assembly comprising:
- a housing;
- a component for suspending the housing from a top portion of the subsurface enclosure;
- an antenna comprising an elongated member having a total length of approximately 0.277λ, where λ corresponds to a frequency, f, in a range from about 450 Mhz to about 470 Mhz, the elongated member having a straight stem part comprising about 20% of the total length and a coiled upper part of about 80% of the total length, the upper part being coiled in a spiral pattern.
Dependencies are inferred from the claim text.