Biomedical Engineering Reference
In-Depth Information
13GHzwith
x
-linearpolarization.Thesourceisplaced16mmbelow
the channel entrance. A 15 mm long dipole antenna is placed at
the channel exit to measure the transmitted amplitude and phase.
By aligning the dipole antenna along either
x
-or
y
-direction, the
transmitted amplitude of either
x
-or
y
-polarization as well as the
relative phase between the
x
-and
y
-polarization can be measured.
A photograph of the sample is shown in Fig. 5.10(b). The thickness
of the sample is 160 mm, and we design
a
=
16 mm,
b
=
4 mm,
=
d
11.32 mm so that the working frequency of robust transport
behavior is around 10 GHz. Photographs of the chiral channel are
shown in Fig. 5.10(c).
5.3.4
Band Structure, Transmissions, and Polarization
The projected band structure along the
z
-direction as well as the
four guided modes in the full bandgap is shown in Fig. 5.11(a). Two
of them are LH polarized and two are RH polarized, as indicated
by blue and red colors, respectively. There is a polarization gap
(indicated by light blue) in which only LH-polarized guided mode
Figure 5.11
(a) Band structure, (b) simulated transmission spectrum, and
(c)measuredtransmissionspectrumforthechiralchannel.In(a),bluesolid
lines stand for LH-guided modes, and red solid lines stand for RH-guided
modes. Black colors stand for projected pass bands.
