lower frequency is slightly shifted up
from 2.43 to 2.54 GHz, and the higher
frequency is markedly shifted up from
5.05 to 5. 41 GHz. The measured return losses for various slit lengths S2
are shown in Figure 3 with S1 = 6
TABLE III
NAR27594IsHalfPINSwitchAd:Layout 1 6/4/09 3:00 PM Page 1
RESONANCE CHARACTERISTICS FOR DIFFERENT L3 LENGTHS
L3 (mm) 1st Resonant
Frequency (GHz)
1st Bandwidth
(%)
2nd Resonant
Frequency
(GHz)
2nd Bandwidth
(%)
7. 53 2.41 16. 6 5.05
5. 53 2.41 14. 11 5. 75
3. 53 2.41 12.03 5. 98
11. 49
13.04
6. 85
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mm. The resonance characteristics
of these antennas are listed in Table
2. The higher resonance frequency is
markedly shifted up from 5.05 to 6. 76
GHz when S2 is increased. Figure 4
shows the measured return losses for
different lengths L3, with S1 = 6 mm
and S2 = 1 mm. When L3 decreases,
the higher frequency is markedly
shifted up from 5.05 to 5. 98 GHz. It
can be found that the length L3 determines the higher frequency, which is
approximately a quarter of a guided
wavelength. The related results are
also listed in Table 3. Figure 5 shows
the measured and simulated return
losses of the proposed antenna, with
S1 = 6 mm, S2 = 1 mm and L3 = 7. 53
mm. The small frequency shift between the measured and simulated
results is caused by the manufacturing
tolerances.
The far-field radiation patterns
were measured and calibrated in a
STUT anechoic chamber. Figure 6
shows the measured radiation patterns
at 2.4 and 5.2 GHz in both the x-z and
y-z planes. Since the feed line is located parallel to the y-axis, the y-z plane
radiation pattern of the proposed antenna has nulls in +y-direction and -y-direction. It is noted that the radiation
pattern in the x-z plane of the antenna
is with omni-directional radiation
characteristics. Figure 7 shows the
measured antenna peak gain against
frequency. The antenna gain is 2.77
5
Shown here
is the SP2T
PIN Switch
4
GAIN (dBi)
3
2
1
0
2.7 2.6 2.5 2.4 2.3 2.2 2.1
FREQUENCY (GHz)
(a)
8
435 Moreland Road
Hauppauge, NY 11788
Tel: 631.231.1700 • Fax: 631.231.1711
e-mail: nardaeast@L-3com.com
www.nardamicrowave.com/east
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GAIN (dBi)
6
4
2
0
6.0 5. 8 5. 6 5. 4
FREQUENCY (GHz)
5.2 5.0
s Fig. 7 Measured antenna gain at (a) 2.4
GHz and (b) 5.2 GHz.
