28-10-2016, 10:22 AM
1461847671-MultibandMicrostrip4GAntennaDesign.pdf (Size: 1.16 MB / Downloads: 4)
Introduction
Recent high traffic demands in wireless communications cause need of more advanced
transmitting, modulating and receiving technologies in communications. Also enormous
increase of mobility requests more capacity and low latency. 4G LTE technology provides
required needs. In Turkey most of telecommunication systems will be compatible with LTEAdvanced
in April, 2016. Antenna design is important part of this new generation
technology. In this project it will be designed and implemented microstrip antenna which
works multiple frequencies allocated for operator companies that are 1.8 Ghz and 2.6 Ghz
and can radiates minimum 6dB.
Antenna Requirements
Again in Turkey there was 4G frequency allocation tender and there will be used following
frequency bands 800Mhz, 900Mhz, 1800Mhz, 2100Mhz and 2600 Mhz. So our designed
antenna should work proper with these needs. Below, it can be seen different antenna
examples from literature for 4G applications. Design parameters should also be proper for
mobile phone equipment. Our chosen antenna’s maximum size are 20mm of width, 50mm
of length and 1.2mm of thickness and has substrate material FR4 proxy. Thereby, these
parameters allow usage of antenna in any modern mobile phone easily.
Simulation Modelling
So, firstly ground rectangular prisma is drawn in HFSS software as material of FR4_epoxy
and perfect e field property added to it. Then patch geometry is drawn above ground as
designed measures for aimed working frequencies for 4G. Feed line is drawn and united
with patch. Perfect e field property also added this united patch. Then at the beginning of
feed line rectangular lumped port added. After all, for observing radiation pattern relatively
big box that has material of air added in structure. Its five faces selected and radiation
property is given. Finally, frequency setup range of 1,5 Ghz to 3 Ghz is set.
Conclusion
In figure 4, it is seen that designed antenna is working at 1800 Mhz having s parameter
-18dB and at 2600 Mhz having s-parameter -22,5 dB. In 1800 Mhz it would be better in dB
but antenna works at exactly aimed frequencies. According to the radiation pattern and gain
figures there is a good agreement between modeling results and real lab experiments. In
figure 10 there is nearly 5.6 dB gain in z direction in expected shape. Finally, our main
expectations like working frequency range and bandwidth, radiation power and gain with
good directivity are satisfied slightly different from exact aim. Thus, this antenna can be
used in mobile phones for 4G communications.