Abstract
Numerical analysis and design of millimeter-wave (mmWave) slot-coupled microstrip 90° hybrid couplers employing circular ring patches, which is operating between 18 and 40 GHz frequency range for K-Band and Ka-Band radar applications, is presented in this paper. The proposed design uses multilayer printed circuit board (PCB) technology that allows having a compact and broad bandwidth coupler. The proposed couplers use broadside coupling between microstrip patches at the top and the bottom layers via an elliptical-shaped slot in the common ground plane (mid-layer). The design uses circular ring shaped broadside coupled patches and an elliptical-shaped slot created in a common ground plane between two identical dielectric substrates. The 3 dB coupler prototype has been fabricated on two 0.127 mm thick Rogers Duroid RT5880 substrates. The circuit occupies the dimensions of less than 5 mm × 5 mm without the extension that is required to insert the connectors. Extensive parametric studies are performed to address the effect of varying the coupler parameters on the coupling values, return losses, isolations, transmission magnitudes and phases through the operational frequency bandwidth. A 3 dB/90° hybrid coupler prototype is fabricated and then tested experimentally using Agilent E8364B PNA Network Analyzer. The simulation and experimental results show a good performance in terms of bandwidth, which covers the entire desired frequency range. In addition, detailed design for different coupling values of the proposed coupler is presented in this paper. The proposed coupler can achieve different coupling values range from 3 up to 9 dB that can be used for switched beam antenna array systems.
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References
Sandrin, W. A. (1974). The Butler matrix transponder. Comsat Technical Review, 4(2), 319–345.
Pozar, D. (2005). Microwave engineering (3rd ed.). New York: Wiley.
Mongia, R., Bahl, I., & Bhartia, P. (1999). RF and microwave coupled-line circuits. Norwood, MA: Artech House.
Engen, G. F. (1977). An improved circuit for implementing the six-port technique of microwave measurements. IEEE Transactions on Microwave Theory and Techniques, MTT-25(12), 1080–1083.
Bialkowski, M. E., & Dimitrios, A. P. (1993). A step-frequency six-port network analyser with a real-time display. AEU International Journal of Electronics and Communication, 47(3), 193–197.
Choi, M. K., Zhao, M., Hagness, S. C., & van derWeide, D. W. (2005). Compact mixer-based 1–12 GHz reflectometer. IEEE Microwave And Wireless Components Letters, 15(11), 781–783.
Chin, T.-Y., Wu, J.-C., Chang, S.-F., & Chang, C.-C. (2009). Compact S-/Ka-band CMOS quadrature hybrids with high phase balance based on multilayer transformer over-coupling technique. IEEE Transactions on Microwave Theory and Techniques, 57(3), 708–715.
Bikiny, A., Quendo, C., Rius, E., Favennec, J. F., Person, C., Potelon, B., Rigaudeau, L., Moroni, P., Cazaux, J. L. (2009). Ka-band lange coupler in multilayer thick-film technology. IEEE MTT-S International Microwave Symposium Digest, Boston, MA, USA (pp. 1001–1004).
Ahmed, O. M. H., Sebak, A., & Denidni, T. A. (2012). A novel butterfly-shaped multilayer backward microstrip hybrid coupler for ultrawideband applications. Microwave and Optical Technology Letters, 54(10), 2231–2237.
Bourreau, D., Della, B., Daniel, E., Person, C., & Toutain, S. (1992). Highperformance lange coupler. Electronics Letters, 28(21), 1997–1998.
Wang, S., Tzuang, C.-K.C. (2007). Compacted Ka-band CMOS rat-race hybrid using synthesized transmission lines. In IEEE MTT-S International Microwave Symposium, pp. 1023–1026.
Tsai, K.-H., Tzuang, C.-K.C. (2010). Design and analysis of a high directivity directional coupler using synthetic coupled lines in CMOS technology. In The 40th European Microwave Conference, Paris, France, pp. 1174–1177.
Chirala, M. K., & Nguyen, C. (2006). Multilayer design techniques for extremely miniaturized CMOS microwave and millimeter-wave distributed passive circuits. IEEE Transactions on Microwave Theory and Techniques, 54(12), 4218–4224.
Tanaka, T., Tsunoda, K., & Aikawa, M. (1988). Slot-coupled directional couplers between double-sided substrate microstrip lines and their application. IEEE Transactions on Microwave Theory and Techniques, 36, 1752–1759.
Abbosh, A. M. (2007). Design of compact directional couplers for UWB applications. IEEE Transactions on Microwave Theory and Techniques, 55(2), 189–194.
IEEE Standard Letter Designations for Radar-Frequency Bands, IEEE Standard 521, 1984.
CSTMicrowave Studio. (2010). Ver. 2010 computer simulation technology. MA, USA: Framingham.
Wong, M. F., Hanna, V. F., Picon, O., & Baudrand, H. (1991). Analysis and design of slot-coupled directional couplers between double-sided substrate microstrip lines. IEEE Transactions on Microwave Theory and Techniques, 39(12), 2123–2129.
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This research is supported by King Abdul-Aziz City for Science and Technology (KACST) Technology Innovation Center in radiofrequency and photonics (RFTONICS) in the e-society hosted at King Saud University.
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Alaqeel, A., Almorqi, S., Haraz, O.M. et al. Design of Multilayered K-Band and Ka-Band Slot-Coupled Microstrip 90° Hybrid Couplers Employing Circular Ring Patch Shapes. Wireless Pers Commun 92, 653–666 (2017). https://doi.org/10.1007/s11277-016-3569-1
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DOI: https://doi.org/10.1007/s11277-016-3569-1