Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
A 4-wire helical antenna unit comprising: a 4-wire helical antenna having a base portion, said 4-wire helical antenna comprising cylindrical portions having different diameters coaxially connected by a tapered portion to form an antenna supporting member having a conductor pattern formed on the surface thereof; coupling and conversion circuits; and a shield plate having an area greater than the cross-sectional area of the base portion of said antenna; wherein an antenna-side face of said shield plate is provided with a layer of material for absorbing electromagnetic waves, and wherein said shield plate is disposed between said base portion and said circuits.
Claim 2
Dependent Claim
101 words
A 4-wire helical antenna unit comprising: a 4-wire helical antenna having a base portion, said 4-wire helical antenna comprising cylindrical portions having different diameters coaxially connected by a tapered portion to form an antenna supporting member having a conductor pattern formed on the surface thereof; coupling and conversion circuits; and a shield plate having an area greater than the cross-sectional area of the base portion of said antenna; wherein an antenna-side face of said shield plate is provided with a layer of material for absorbing electromagnetic waves, and wherein said shield plate is disposed between said base portion and said circuits.
Claim 3
Dependent Claim
27 words
A 4-wire helical antenna unit as claimed in claim 1, in which said antenna supporting member has two ends, wherein one end comprises a tapered end portion.
Claim 4
Dependent Claim
120 words
A 4-wire helical antenna element comprising: an antenna supporting member made of a dielectric material, having first and second cylindrical portions and first and second tapered portions, said first tapered portion being provided at a top end of said first cylindrical portion, and said second tapered portion being provided between said first and second cylindrical portions, said second cylindrical portion having a greater diameter than said first cylindrical portion, and said first and second cylindrical portions formed so as to be coaxially aligned with each other; and a plurality of conductors, each comprising a metal helical winding formed on a surface of said antenna supporting member, each said helical winding completing less than two turns about said antenna supporting member.
Claim 5
Dependent Claim
120 words
A 4-wire helical antenna element comprising: an antenna supporting member made of a dielectric material, having first and second cylindrical portions and first and second tapered portions, said first tapered portion being provided at a top end of said first cylindrical portion, and said second tapered portion being provided between said first and second cylindrical portions, said second cylindrical portion having a greater diameter than said first cylindrical portion, and said first and second cylindrical portions formed so as to be coaxially aligned with each other; and a plurality of conductors, each comprising a metal helical winding formed on a surface of said antenna supporting member, each said helical winding completing less than two turns about said antenna supporting member.