If the radii of the ith stage helical line are different from which in other stages, the geometric parameters such as [r.sub.1], [r.sub.2], [r.sub.3], [delta], p and [psi] in (1)~(5) can be substituted by [r.sub.1i], [r.sub.2i], [r.sub.3i], [[delta].sub.i], [p.sub.i] and [[psi].sub.i] respectively.
According to (8), the current density waves in the (i + 1)th stage helical line are determined by the current density waves in the ith stage line.
Properties of the helical line
with internal anisotropic shields are revealed using the multiconductor line method and the CST software package Microwave Studio.
The axis of fibrous ribbon is located through helical line and the axis of yarn lay along fibrous ribbon.
The angle Beta of helical line is twist angle as shown in Fig.
Antenna is made up with coaxial supply line, metal ground, helical line radiator whose coil number is few and a loaded metal disk which is apart from the helical line.
As is shown, at a typical frequency 2.4 GHz, the length of the first circle helical line is 0.82[lambda].
The improvement of the construction of the screw in a classical approach (2), (3), (6) consists in changing its constructional parameters such as length, diameter, pitch and multiplication factor of the helical line
, height and width of the flow helical channel, and taper angle of the flow channel helical line
The Helix Scanning function allows a cylinder to be probed in a continuous helical line
as one element.
3(b)) decreases if the distance between helices decreases and it can be sufficiently lower than the input impedance of the helical line
with the plane symmetry.
In the initial design, the input impedance of the LTCC chip antenna is capacitive, hence several closer turns of helical lines
are used as an inductor for input impedance matching.