SAMPE Journal - July/August 2017 - 32
Feature
Figure 2. Photographs of (a) copper pasted broadband antenna (CPBA) and
(b) silver ink printed broadband antenna (SPBA).
where PT is the maximum tensile
load of the specimen, b and h are
width and thickness of the specimen.
The three-point bending test was
performed using the same machine
as for the tensile test, the loading rate
was set at 10 mm/min. The length
and width of the specimen were
100mm and 15mm respectively, the
span-to-depth ratio was 16:1. The
bending strength (sB) is calculated
with the following equation:
where PB is the maximum bending
load, l is the span length, b and h are
width and thickness of the specimen.
Moreover, partial radiation patches
with length of 50mm were introduced
in the center of the test specimens,
five specimens were tested for each
sample.
Results and Discussion
Return Loss
The simulated and measured
return losses of the broadband
antennas are shown in Figure 3. The
bandwidth of the silver ink printed
broadband antenna was 125MHz
Figure 3. The measured and simulated return loss of the broadband antenna.
32
from 1.462 GHz to 1.587GHz which
successfully covered the GPS and
Beidou frequency band. However,
the copper pasted broadband
antenna did not achieve the -10dB
requirement in the frequency band
from 1.491GHz to 1.524GHz. In
addition, both two antennas showed
decrease of the resonant frequencies
compared with the simulated
results. The possible reason was that
the copper foil and the glass fabric
bounded weakly and delaminate
was caused during the curing
process, that increased the height
of the substrate and decreased the
resonant frequency. Furthermore,
the deformation of the copper foil
during composite fabrication process
decreased the accuracy of the U-slot
dimensions, then, influenced the
impedance matching and the return
loss. For the silver ink printed
broadband antenna, the possible
reason for resonant frequency may
because that the silver ink infiltrated
into the space of the glass fabric and
increase the dielectric constant of the
substrate.
Radiation Pattern
Figure 4 shows the measured and
simulated radiation patterns of the
broadband antennas. It can be seen
that the measured results in E and
H planes, which are two reference
planes of the antenna, exhibited the
typical linear microstrip antenna
radiation pattern. In the E and H
planes, the highest amplitude was
at around 0 and 180 degrees for both
copper pasted antenna and silver ink
printed antenna. At the same time,
the measured radiation patterns had
good agreement with the simulated
radiation patterns for both E plane
and H plane, indicating the desired
radiation directivity of the designed
antennas were obtained through this
study.
Tensile Properties
In the tensile test, three types of
composite samples which were with
no radiation patch (NRP), copper
pasted radiation patch (CPRP) and
SAMPE Journal, Volume 53, No. 4, July/August 2017
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