volume | PIER Journals

Abstract

A new high isolation lumped-element 180º hybrid, using electronically adjustable filters with varactor diodes, are proposed. This design is very simple and is based on only two configurable low order (N = 2) filters. Due to the limited tuning frequency range of varactor diodes, maximum near-octave frequency coverage of 2.5-5 GHz was planned in the high isolation hybrid. An impressive simulated typical isolation in the range of >60dB was achieved. One of the typical applications of developed hybrids could be the conversion of 70MHz IF to microwave frequencies, with broadband mixers in single-conversion converters, and with very high LO rejection (>60 dB).

1. March, S., "A wide band stripline hybrid ring," IEEE Trans. on Microwave Theory & Tech., Vol. 16, No. 6, 361, Jun. 1968.
doi:10.1109/TMTT.1968.1126693 Google Scholar

2. Kang, I.-H. and K. Wang, "A broadband rat-race ring coupler with tightly coupled lines," IEICE Trans. on Commun., Vol. E88-B, No. 10, 4087-4089, Oct. 2005.
doi:10.1093/ietcom/e88-b.10.4087 Google Scholar

3. Chiu, L., Q. Xue, and C. H. Chan, "A compact wideband parallel- strip 180^o hybrid coupler," Microwave and Optical Technology Letters, Dec. 2008. Google Scholar

4. Zubillaga, I. G., "Single side-band modulator with suppressed carrier --- SSBSC --- By direct conversion of 70MHz intermediate frequency to ultra-wide band of microwave range (2.5 to 10.5 GHZ),", Ph. Doctoral Thesis, Tenun-University of Navarra,Dec. 2008, http://dspace.unav.es/dspace/handle/10171/18734. Google Scholar

5. Parisi, S. J., "A lumped element rat-race coupler," Applied Microwaves, 84-93, Aug./Sep. 1989. Google Scholar

6. Staudinger, J. and J. Costa, "Lumped-element networks compose wide-bandwidth balun," Microwaves & RF, 1993. Google Scholar

7. Giannini, F. and L. Scucchia, Dual-Band 180^o Lumped-element Hybrid: Mixer Application, Wiley Interscience, 2004.

8. Kuylenstierna, , D. and P. Linner, "Design of broad-band lumped-elements baluns with inherent impedance transformation," IEEE Trans. on Microwave Theory & Tech., Vol. 52, No. 12, Dec. 2004. Google Scholar

9. Vendik, I., D. Kholodnyak, P. Kapitanova, M. A. Hein, S. Humbla, R. Perrone, and J. Mueller, "Tuneable dual-band microwave devices based on a combination of left/right-handed transmission lines," Proceedings of the 38th European Microwave Conference EuMA, 2008. Google Scholar

10. Kapitanova, P., D. Kholodnyak, and I. Vendik, "Tuneable lumped-element directional coupler using metamaterial transmission lines," Proceedings of the 39th European Microwave Conference, EuMA , 2009. Google Scholar

11. Hartley, R. V. L., "Modulation system," US Patent 1666, 206, 1923. Google Scholar

12. Parisi, S. J., "Monolithic, lumped element, single sideband modulator," IEEE MTT-S Digest, 1992. Google Scholar

13. Smv2019-smv2023 series hyperabrupt junction tuning varactors, Data-Sheet Skyworks Solutions Inc., 2011, www.skyworksinc.com. Google Scholar

Dr. Iñaki Gurutzeaga

Dr. Ane Insausti

Dr. Egoitz Celayeta

Dr. Beatriz Sedano