technological and educational institute of central...
TRANSCRIPT
TECHNOLOGICAL AND EDUCATIONAL INSTITUTE
OF CENTRAL MACEDONIA, SERRES, GREECE
DEPARTMENT OF COMPUTER ENGINEERING
TELFOR 14, 25 - 27 November 2014, Belgrade, Serbia
3-WAY WIDE-BAND PLANAR
POWER DIVIDER
Stelios Tsitsos, Hristos T. Anastassiu, and Anastasios D. Papatsoris
Presentation Outline
Introduction
Circuit Analysis
Implementation and Results
Conclusions
This research work has been co-financed by the European Union (European Social Fund –
ESF) and Greek national funds through the Operational Program "Education and Lifelong
Learning" of the National Strategic Reference Framework (NSRF) - Research Funding
Program: ARCHIMEDES III Investing in knowledge society through the European Social
Fund.
TELFOR 14, 25 - 27 November 2014, Belgrade, Serbia
Introduction
Power dividers are key elements in modern RF front-end
communication systems
They are used in various applications:
Power division and/or combination in antenna arrays distribution
networks
Microwave mixers, amplifiers and oscillators
High speed digital integrated circuits
TELFOR 14, 25 - 27 November 2014, Belgrade, Serbia
Introduction
Wilkinson-type dividers are widely used
However n-way Wilkinson dividers are non-planar for n≥3
Why? 3-D floating common node makes planar implementation very difficult
Known planar structures in literature:
provide only even number of output ports
or too complicated: multi-section or coupled lines
TELFOR 14, 25 - 27 November 2014, Belgrade, Serbia
Introduction (cont.)
This work: simple and compact 3-way planar power divider
is presented
Demonstrates good return loss and isolation characteristics
Wide-band operation (2-4 GHz)
Expandable to n-way structure
Practical characteristic impedance values, easy
implementation, design flexibility
TELFOR 14, 25 - 27 November 2014, Belgrade, Serbia
Proposed 3-way, wide band
power divider Proposed power divider key features :
Employs λ/4 transmission lines and isolation resistors R
Equal splitting
Additional λ/4 transmission lines in ports 1, 3 for impedance matching and
wide band functionality
Fig. 1 Proposed 3-way wide band power divider
TELFOR 14, 25 - 27 November 2014, Belgrade, Serbia
0
2
21
Z
ZZ in
0
2
3
3Z
ZZ in
Circuit Analysis 1/6
Fig. 2 Circuit of the BLOCK (shown in Fig. 1) with a voltage applied at port 2
02
2
2
21
2
10
2
21
2
10
2
)2(Z
RZZZZZ
RZZZZZ inC
2
210
2
21
2ZZZ
ZZZ inA
2
2
2
21
2
10 2
Z
ZZZZZ inB
2
2
2
21
2
10
2
21
2
10
2
)2(
RZZZZZ
RZZZZZ inC
TELFOR 14, 25 - 27 November 2014, Belgrade, Serbia
Matching at port 2:
Apply V2
Ports 3, 4
grounded
Apply V4
Ports 2, 3
grounded
Symmetric
Circuit Analysis 2/6
Fig. 3 Circuit of the BLOCK (shown in Fig. 1) with a voltage applied at port 3
TELFOR 14, 25 - 27 November 2014, Belgrade, Serbia
Matching at port 3:
2
21
2
0
2
2
2
10
4
2
2
21
2
10
2
2
42
)2(
ZZZZZZRZ
ZZZZRZ
0
2
3
Z
Z
2
210
2
21
2ZZZ
ZZZ inA
2
2
2
21
2
10 2
Z
ZZZZZ inB
2
21
2
0
2
2
2
10
4
2
2
21
2
10
2
2
42
)2(
ZZZZZZRZ
ZZZZRZZ inC
Apply V3
Ports 2, 4
grounded
Implementation
TELFOR 14, 25 - 27 November 2014, Belgrade, Serbia
02
2
2
21
2
10
2
21
2
10
2
)2(Z
RZZZZZ
RZZZZZ inC
2
21
2
0
2
2
2
10
4
2
2
21
2
10
2
2
42
)2(
ZZZZZZRZ
ZZZZRZ
0
2
3
Z
Z
Design equations:
Z1
(Ohms)
Z2
(Ohms)
Z3
(Ohms)
R
(Ohms)
63.40 37.30 39.30 77.77
Table 1: Electrical parameter values for the circuit of Fig. 1.
Solution example:
(not unique)
Fabrication
Fabricated on PCB using
TACONIC substrate
Typical dielectric constant
εr=2.2
Commercial 100 Ohms
microwave resistors used
to achieve necessary
isolation between output
ports.
Fig. 4 Fabricated power divider
TELFOR 14, 25 - 27 November 2014, Belgrade, Serbia
Results
Scattering parameters measured using an Agilent E5071C VNA
over the frequency range 1 – 5 GHz. Simulations by Keyside ADS.
Fig. 5 Measured vs. simulated results for (a) Input return loss (b) Output return loss of
fabricated power divider
(a) (b)
TELFOR 14, 25 - 27 November 2014, Belgrade, Serbia
(a) (b)
TELFOR 14, 25 - 27 November 2014, Belgrade, Serbia
Fig. 6 Measured vs. simulated results for output return loss of
fabricated power divider
Results
TELFOR 14, 25 - 27 November 2014, Belgrade, Serbia
Fig. 7 Measured vs. simulated results for insertion loss of
fabricated power divider
Results
TELFOR 14, 25 - 27 November 2014, Belgrade, Serbia
Fig. 8 Measured vs. simulated results for port isolation of
fabricated power divider
Results
Conclusions
In this work a planar 3-way wide-band power divider with a simple and
compact structure was designed, simulated, fabricated and tested
The mathematical analysis and the extraction of the design equations
were based on transmission line theory
Measured results showed good agreement with predicted data.
The proposed structure provides design flexibility and can be
expanded to an n-way divider
TELFOR 14, 25 - 27 November 2014, Belgrade, Serbia
Thank you
for your attention!
TELFOR 14, 25 - 27 November 2014, Belgrade, Serbia