3-WAY WIDE-BAND PLANAR POWER DIVIDER

Transcription

1 TECHNOLOGICAL AND EDUCATIONAL INSTITUTE OF CENTRAL MACEDONIA, SERRES, GREECE DEPARTMENT OF COMPUTER ENGINEERING 3-WAY WIDE-BAND PLANAR POWER DIVIDER Stelios Tsitsos, Hristos T. Anastassiu, and Anastasios D. Papatsoris TELFOR 4, 5-7 November 4, Belgrade, Serbia

2 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 4, 5-7 November 4, Belgrade, Serbia

3 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 4, 5-7 November 4, Belgrade, Serbia

4 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 4, 5-7 November 4, Belgrade, Serbia

5 Introduction (cont.) This work: simple and compact 3-way planar power divider is presented Demonstrates good return loss and isolation characteristics Wide-band operation (-4 GHz) Expandable to n-way structure Practical characteristic impedance values, easy implementation, design flexibility TELFOR 4, 5-7 November 4, Belgrade, Serbia

6 Proposed 3-way, wide band Proposed power divider key features : power divider Employs λ/4 transmission lines and isolation resistors R Equal splitting Additional λ/4 transmission lines in ports, 3 for impedance matching and wide band functionality in in 3 3 Fig. Proposed 3-way wide band power divider TELFOR 4, 5-7 November 4, Belgrade, Serbia

7 Circuit Analysis /6 Fig. Circuit of the BLOCK (shown in Fig. ) with a voltage applied at port ) ( R R inc ina inb ) ( R R inc TELFOR 4, 5-7 November 4, Belgrade, Serbia Matching at port : Apply V Ports 3, 4 grounded Apply V4 Ports, 3 grounded Symmetric

8 Circuit Analysis /6 Fig. 3 Circuit of the BLOCK (shown in Fig. ) with a voltage applied at port 3 TELFOR 4, 5-7 November 4, Belgrade, Serbia Matching at port 3: 4 4 ) ( R R 3 ina inb 4 4 ) ( R R inc Apply V3 Ports, 4 grounded

9 Implementation Design equations: inc ( ) R R R ( 4 R 4 ) 3 Solution example: (not unique) 3 R (Ohms) (Ohms) (Ohms) (Ohms) Table : Electrical parameter values for the circuit of Fig.. TELFOR 4, 5-7 November 4, Belgrade, Serbia

10 Fabrication Fabricated on PCB using TACONIC substrate Typical dielectric constant εr=. Commercial Ohms microwave resistors used to achieve necessary isolation between output ports. Fig. 4 Fabricated power divider TELFOR 4, 5-7 November 4, Belgrade, Serbia

11 Results Scattering parameters measured using an Agilent E57C VNA over the frequency range 5 GHz. Simulations by Keyside ADS. (a) (b) Fig. 5 Measured vs. simulated results for (a) Input return loss (b) Output return loss of fabricated power divider TELFOR 4, 5-7 November 4, Belgrade, Serbia

12 Results (a) (b) Fig. 6 Measured vs. simulated results for output return loss of fabricated power divider TELFOR 4, 5-7 November 4, Belgrade, Serbia

13 Results Fig. 7 Measured vs. simulated results for insertion loss of fabricated power divider TELFOR 4, 5-7 November 4, Belgrade, Serbia

14 Results Fig. 8 Measured vs. simulated results for port isolation of fabricated power divider TELFOR 4, 5-7 November 4, Belgrade, Serbia

15 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 4, 5-7 November 4, Belgrade, Serbia

16 Thank you for your attention! TELFOR 4, 5-7 November 4, Belgrade, Serbia