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APUSNCURSINRSM.2017.8072275

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A Novel Ultra Compact Four-way Power Divider
with Integrated Filtering Function for WLAN
Applications
Ahmed M. Hussien, 2Yasser S. Farag, and
3
Ahmed F. Daw
1
4
Mahmoud A. Abdalla
Electronic Engineering Department
MTC College
Cairo, Egypt
4
maaabdalla@ieee.org
Electronics and Communications Department
MSA University, Cairo, Egypt
1
ahmed.mohamed132@msa.edu.eg,
2
yasser.sobhy@msa.edu.eg, 3afali@msa.eun.eg
of LR and CL then shunt combination of LL and CR connected to
the ground with via. This circuit is claim with the single band
filtering response characteristics that are required for this
proposed divider.
Abstract?A four-way ultra-compact power divider is
proposed in this paper for antenna array applications. The power
divider is constructed based on composite right/left handed
microstrip structure. The analytical analysis are presented. The
divider operates at 5.2 GHz for WLAN services. This paper
introduces equivalent circuit, 3D full wave simulation, and in
addition to that, this design realizes compactness size 20�mm2,
(0.62�186) ?2g.
Keywords?Ultra Compact divider, CRLH four way-power
divider, WLAN applications, filtering divider.
I.
INTRODUCTION
Nowadays, expanding requests in the modern wireless and
mobile communication frameworks lead to the fast
enhancement for presenting RF components with single filtering
characteristic, having more compact size .The composite right
left handed transmission line (CRLH-TL) has been applied in
many microwave components design. Power dividers are the
key segments to acknowledge numerous important RF
applications like RF power amplifier, quadrature adjusted RF
mixer, resonators. A few past reviews have been executed many
sorts of power dividers [1]-[5]. As the minimization of size of
power dividers is our interest. This paper presents a compact
four way power divider with filtering responses for suitable for
array antenna. A high selectivity is required to suppress
unwanted signals, single filtering function particulars
appropriate for WLAN applications. The whole four-way power
divider is minimum with size of 20.4�mm2.
II.
Fig. 1. Block diagram for integrated phase array antennas with power divider
and phase shifters.
DESIGN OF FOUR WAY NOVEL POWER DIVIDER
One of the hot topic for WLAN applications is the integrated
subsystem for serving this band. The block diagram is shown in
Fig.1 it shows that, the subsystem of WLAN band urgent need
mainly three components; compact power divider, phase
shifters, and array antennas. The main goal for this paper is to
present new configuration of very compact four way power
divider that is suitable for WLAN system. The main concept to
design a compact power divider is to implement matching unit
cell of CRLH transformer to match between the inputs and
outputs terminals. The equivalent circuit for CRLH unit cell is
presented in Fig.2 (a). It is constructed with- series combination
978-1-5386-3284-0/17/$31.00 �17 IEEE
Fig. 2. (a): Equavelent circuit for CRLH unit cell, (b); Layout for single CRLH
unit cell.
465
AP-S 2017
The analysis of this circuit based on microwave periodic
analysis is clam that CRLH TL has left and right handed
passbands at lower and higher frequencies, respectively. The
basic important step for designing the CRLH transformer it is
the cut-off frequencies for pass band. These values could be
calculated based on ?d to be either zero or ?, where:
cos ?d ? 1 ?
ZY
2
functions. The simulated 3D model scattering parameter phase
for the designed CRLH cell of the four way power divider is
shown in Fig.4. As appeared in the figure, the transmission
coefficients has 90 degrees was accure two times during the pass
band at 4.8 GHz, and 5.6 GHz. The compassion between the
proposed ultra-compact power divider with the recent power
dividers are presented in table (I). As tabulated, the comparison
introduces that the effective circuit size of proposed power
divider is very compact compared with the recent introduced
dividers.
(1)
cos ?d ? 1 ?
?d 2 2
?C
L ? C L ?
1
? ?? R ? R ?? ? R R ?
? [? LR C R ? 2
? LL C R ? C L LL ? 4C L LL ?
?2
(2)
Finally, the cuttoff frequencies will be resented as:
? 1
f c1 ? min ?
? 2?
?
? 1
f c 2 ? max ?
? 2?
?
1
1
,
2
LL C R ?
1
LL C R
,
1
2?
?
?
?
?
(3)
?
?
LR C L ??
(4)
1
LR C L
1
Based on the above equations (3), and (4) the cuttoff
frequencies are selected to be 5 GHz for lower cut off and 6.5
GHz at the higher cut-off. The layout of the CRLH unit cell is
presented in Fig.2 (b).
Fig. 4. Magnitude and phase responses for purposed integrated filtered CRLH
power divider.
The proposed layout of the CRLH filtered power divider are
illustrated in Fig. 3 with the total all compact size equals 20�mm2 (0.62�186) ?2g. The design of this proposed power
divider has been designed on Rogers substrate with a thickness
of 1.52 mm, a dielectric constant of 3.55.
TABLE I.
COMPARISON WITH EXISTING POWER DIVIDERS
Proposed
Effective circuit size
(?2g)
0.62�186
[2]
0.54�45
17
15
[3]
0.62�186
13
6.42
[4]
0.92�4
20
6.18
[5]
0.87�35
15
6.44
Ref
Return loss
(dB)(center)
Insertion loss
(dB)
6.4
6.19
IV. CONCLUSION
This paper has presented ultra-compact four way power
divider integrated with filtering for WLAN applications,
compatible with phase array antennas subsystems. The created
results outcomes represent transmission coefficients equals ? 6.4
dB, and the return loss equals 17 dB at 5.2 GHz. Additionally,
the proposed size is equal 20�mm2 (0.62�186) ?2g.
Fig. 3. Four-way ultra-compact power divider layout for WLAN applications.
III.
RESULTS OF PROPOSED POWER DIVIDER
REFERENCES
The designed lumped element CRLH structure has been
realized using distributed elements in asymmetric loading
configuration to minimize the power divider size. The
dimensions are designed based on the equivalent circuit model
lumped components values. An extra tuning has been carried out
using 3D electromagnetic full wave simulation.
[1]
[2]
[3]
The four way power divider presents return loss 10 dB
extended from 5 GHz till 6.5 GHz, and reach to 22.5 dB at 5.2
GHz as shown in Fig.4. The insertion loses is 6.4 dB from 5 GHz
to 6 GHz. Moreover, the passband filter support WLAN
applications based on the introduced design with bandwidth
equal 1.3 GHz. The utilized CRLH TLs are intended to have a
function impedance transformer, in order, to achieve a matching
[4]
[5]
466
Ahmed F. Daw, Mahmoud A. Abdalla, and Hadia M. Elhennawy "DualBand Divider Has Rejection Band at 5 GHz", Microwaves and RF
Magazine, Vol. 11, no.1, Nov. 2016.
T. Zhang, W. Che, H. Chen and W. Feng, "A Compact Four-way Dualband Power Divider Using Lumped Elements," in IEEE Microwave and
Wireless Components Letters, vol. 25, no. 2, pp. 94-96, Feb. 2015.
N. Gao, G. Wu and Q. Tang, "Design of a Novel Compact Dual-Band
Wilkinson Power Divider With Wide Frequency Ratio," in IEEE
Microwave and Wireless Components Letters, vol. 24, no. 2, pp. 81-83,
Feb. 2014.
M. J. Park, "Two-Section Cascaded Coupled Line Wilkinson Power
Divider for Dual-Band Applications," in IEEE Microwave and Wireless
Components Letters, vol. 19, no. 4, pp. 188-190, April 2009.
M.-J. Park and B. Lee, ?A dual-band Wilkinson power divider,? IEEE
Microw. Wireless Compon. Lett., vol. 18, no. 2, pp. 85?87, Feb. 2008.
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