17-09-2012, 05:30 PM
New Dual-Frequency Microstrip Antennas for Wireless Communication
[attachment=33900]
Abstract.
The investigations on two new short-circuited microstrip patch
antennas, which are able to radiate dual frequencies at GPS and Bluetooth
frequency bands, are reported. One of these antennas is combination of two
square patch sections and the other is combination of two circular patch sec-
tions, both of which are grounded by shorted pins. Using these antennas, by
properly choosing the positions of shorted pins, good impedance matching can
be obtained at both the frequencies. The dual frequency natures of the shorted
patchs, theoretically obtained using IE3D software, are veri¯ed by measurement.
Introduction
The increasing use of wireless communication systems demands the antennas for
di®erent systems and standards with properties like compact, broadband, multiple
resonant frequencies. Because of many attractive features, microstrip patch antennas
have received considerable attention for mobile communication handset terminals.
In wireless communications, for di®erent systems and standards di®erent frequency
bands are allocated, two of which are Global Positioning System (GPS, 1.575 GHz
Band) and Bluetooth (2.4 GHz Band). The challenge is to design reduced size and
moderate gain multi-frequency antenna for wireless terminals.
Computed and Measured Results
The Method of Moment using IE3D software is used for the analysis and design
of the short circuited dual-frequency microstrip antenna. The antenna was fabricated
on Glass Epoxy substrate with dielectric constant 4.36 and height 1.57 mm and mea-
surement was done using Vector Network Analyzer (N5230A, Agilent Technologies).
The antennas were fed by SMA connectors at the common corner of the two patches
as shown in Fig. 1 and Fig. 2 and the section 1 and section 2 of the antennas were
short circuited using very thin copper wires (of about 0.2 mm diameter). The one end
of the shorted wire was connected with the patch and the other end was connected
with the ground plane. The positions of the shorting posts were determined using
Genetic Algorithm (GA) optimizer of IE3D software.
Conclusion
Theoretical and experimental investigations on new short-circuited dual-frequency
microstrip antennas are reported. The resonance frequency and impedance matching
depend on the positions of shorted posts. The results are supported by measurements.
The antennas can be used for multi-band wireless communications.
[attachment=33900]
Abstract.
The investigations on two new short-circuited microstrip patch
antennas, which are able to radiate dual frequencies at GPS and Bluetooth
frequency bands, are reported. One of these antennas is combination of two
square patch sections and the other is combination of two circular patch sec-
tions, both of which are grounded by shorted pins. Using these antennas, by
properly choosing the positions of shorted pins, good impedance matching can
be obtained at both the frequencies. The dual frequency natures of the shorted
patchs, theoretically obtained using IE3D software, are veri¯ed by measurement.
Introduction
The increasing use of wireless communication systems demands the antennas for
di®erent systems and standards with properties like compact, broadband, multiple
resonant frequencies. Because of many attractive features, microstrip patch antennas
have received considerable attention for mobile communication handset terminals.
In wireless communications, for di®erent systems and standards di®erent frequency
bands are allocated, two of which are Global Positioning System (GPS, 1.575 GHz
Band) and Bluetooth (2.4 GHz Band). The challenge is to design reduced size and
moderate gain multi-frequency antenna for wireless terminals.
Computed and Measured Results
The Method of Moment using IE3D software is used for the analysis and design
of the short circuited dual-frequency microstrip antenna. The antenna was fabricated
on Glass Epoxy substrate with dielectric constant 4.36 and height 1.57 mm and mea-
surement was done using Vector Network Analyzer (N5230A, Agilent Technologies).
The antennas were fed by SMA connectors at the common corner of the two patches
as shown in Fig. 1 and Fig. 2 and the section 1 and section 2 of the antennas were
short circuited using very thin copper wires (of about 0.2 mm diameter). The one end
of the shorted wire was connected with the patch and the other end was connected
with the ground plane. The positions of the shorting posts were determined using
Genetic Algorithm (GA) optimizer of IE3D software.
Conclusion
Theoretical and experimental investigations on new short-circuited dual-frequency
microstrip antennas are reported. The resonance frequency and impedance matching
depend on the positions of shorted posts. The results are supported by measurements.
The antennas can be used for multi-band wireless communications.