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Progress In Electromagnetics Research C
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REALIZATION OF A COMPACT BRANCH-LINE COUPLER USING QUASI-FRACTAL LOADED COUPLED TRANSMISSION-LINES

By M. Nosrati and B. S. Virdee

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Abstract:
An extremely compact branch-line coupler operating at 900 MHz is presented without the use of viaholes, multilayered technique, or air-bridged. The technique presented here uses the concept of fractals to load a coupled transmission-line in order to realize a compact quarter-wavelength transmission-line, which forms the couplers arms. It is shown that the proposed branch-line coupler's performance is analogous to a conventional branch-line coupler with the benefit of substantially reduced physical dimensions by a factor of 78%. The measured result of the fabricated microstrip branch-line coupler is compared with the simulation data. The agreement of the measurement and simulated confirms the theory and validates the proposed coupler design.

Citation:
M. Nosrati and B. S. Virdee, "Realization of a Compact Branch-Line Coupler Using Quasi-Fractal Loaded Coupled Transmission-Lines," Progress In Electromagnetics Research C, Vol. 13, 33-40, 2010.
doi:10.2528/PIERC10031303

References:
1. Hettak, K., G. A. Morin, and M. G. Stubbs, "Compact MMIC CPW and asymmetric CPS branch-line couplers and Wilkinson dividers using shunt and series stub loading ," IEEE Trans. Microwave Theory & Tech., Vol. 53, 1624-1635, 2005.
doi:10.1109/TMTT.2005.847052

2. Liao, S.-S. and P.-T. Sun, "A novel compact-size branch line coupler," IEEE Trans. Microwave Theory & Tech., Vol. 15, 588-590, Sep. 2005.

3. Vogel, R. W., "Analysis and design of lumped and lumped-distributed element directional coupler for MIC and MMIC applications," IEEE Trans. Microwave Theory & Tech., Vol. 41, 2116-2125, 1993.
doi:10.1109/22.260695

4. Hirota, T., A. Minakawa, and M. Murauchi, "Reduced-size branch-line and rate-race hybrids for uniplanar MMICs," IEEE Trans. Microwave Theory & Tech., 270-275, 2002.

5. Chan, Y.-H. and J.-S. Hong, "Compact wide-band branch-line hybrids," IEEE Trans. Microwave Theory & Tech., Vol. 54, 704-709, 2006.
doi:10.1109/TMTT.2005.863051

6. Nosrati, M., "An extremely miniaturized microstrip branch-line coupler," Microwave and Opt. Tech. Lett., Vol. 51, 1403-1406, 2009.
doi:10.1002/mop.24365

7. Shamsinejad, S., M. Soleimani, and N. Komjani, "Novel enhanced and miniaturized 90o coupler for 3g eh mixers," Progress In Electromagnetics Research Letters, Vol. 3, 43-50, 2008.
doi:10.2528/PIERL08012702

8. Nosrati, M. and S. K. Valashani, "A novel compact branch-line coupler using four coupled transmission lines," Microwave and Opt. Tech. Lett., Vol. 50, 1712-1714, 2008.
doi:10.1002/mop.23460

9. Hayati, M. and M. Nosrati, "Loaded coupled transmission line approach of left-handed (LH) structures and realization of a highly compact dual-band branch-line coupler ," Progress In Electromagnetics Research C, Vol. 10, 75-86, 2009.
doi:10.2528/PIERC09041508

10. Nosrati, M. and A. Najafi, "Bandwidth enhancement and further size reduction of a class of elliptic-function low-pass filter using modified hairpin resonators," Progress In Electromagnetics Research C, Vol. 5, 187-194, 2008.
doi:10.2528/PIERL08111805

11. Nosrati, M., T. Faraji, and Z. Atlasbaf, "A compact composite broad stop-band elliptic-function low-pass filter for ultra wide-band applications using interdigital capacitors," Progress In Electromagnetics Research Letters, Vol. 7, 87-95, 2009.
doi:10.2528/PIERL09011707

12. Malherbe, J. A. G., Microwave Transmission Line Filters, 24-26 and 71-79, Artech House, 1979.


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