Liquid crystal dual-mode band-pass filter with improved performance

• Autorzy: Torrecilla J. , Marcos C. , Urruchi V. , Sánchez-Pena J. M. , Chojnowska O.

Identyfikatory

DOI

10.1515/oere-2015-0020

• Języki publikacji: EN

Abstrakty

EN

Over the last twenty years, there has been a growing interest in the design of tunable devices at microwave frequencies by using liquid crystals technology. In particular, the use of liquid crystals with high dielectric anisotropy allows manufacturing voltage-controlled devices to operate in a wide frequency range. In this work the frequency response of a liquid crystal band-pass filter with dual-mode microstrip structure has been studied in depth by using a simulation software tool. A reshaping of a conventional dual-mode square patch resonator band pass filter with a square notch, studied in the literature, has been proposed with the goal of improving the filter performance. The main features achieved are a significant increase in the return loss of the filter and a narrowing of a 3-dB bandwidth. Specifically, a reduction in the filter bandwidth from 800 MHz to 600 MHz, which leads to a return loss increase from 6 dB to 12.5 dB, has been achieved. The filter centre frequency can be tuned from 4.54 GHz to 5.19 GHz.

Słowa kluczowe

EN

dual-mode filter; inverted microstrip structure; liquid crystal; tunable filter

• Wydawca: Stowarzyszenie Elektryków Polskich ; Polska Akademia Nauk ; Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
• Czasopismo: Opto-Electronics Review
• Rocznik: 2015
• Tom: Vol. 23, No. 2
• Strony: 121--125
• Opis fizyczny: Bibliogr. 11 poz., rys., wykr.

Twórcy

autor

Torrecilla J.

• Grupo de Displays y Aplicaciones Fotónicas, Dpto. Tecnología Electrónica, Universidad Carlos III, 15 C/Butarque, St., E28911 Leganés, Madrid, Spain

autor

Marcos C.

• Grupo de Displays y Aplicaciones Fotónicas, Dpto. Tecnología Electrónica, Universidad Carlos III, 15 C/Butarque, St., E28911 Leganés, Madrid, Spain

autor

Urruchi V.

• Grupo de Displays y Aplicaciones Fotónicas, Dpto. Tecnología Electrónica, Universidad Carlos III, 15 C/Butarque, St., E28911 Leganés, Madrid, Spain

autor

Sánchez-Pena J. M.

• Grupo de Displays y Aplicaciones Fotónicas, Dpto. Tecnología Electrónica, Universidad Carlos III, 15 C/Butarque, St., E28911 Leganés, Madrid, Spain

autor

Chojnowska O.

• Institute of Chemistry, Military University of Technology, 2 Kaliskiego St., 00-908 Warsaw, Poland

Bibliografia

• 1. M. Stems, R. Rchner, D. Schneiderbanger, S. Martius, and L. P. Schmidt, “Novel tunable hexaferrite bandpass filter based on open-ended finlines”. Proc. IEEE MTT-S-lnt. Microwave Symp., pp. 637-640, Atlanta, 2008.
• 2. K. Entcrsari and G. Rcbeiz “A 12-18-GHz three-pole RF MEMS tunable filter”, IEEE Trans. Microw. Theory Techn. 53, 2566-2571 (2005).
• 3. P.J. Collings and M. Hird, Introduction to Liquid Crystals Chemistry and Physics, Taylor & Francis, 1997.
• 4. N. Martin, P. Laurent, C. Person, P. Gelin, and F. Hurct, “Size reduction of a liquid crystal-based, frequency-adjustable patch antenna” 34th Eur. Microw. Integral 1-3, 825-828, (2004).
• 5. S. Muller, P. Scheele, C. Weil, M. Wittek, C. Hock, and R. Jakoby, “Tunable passive phase shifter for microwavc applications using highly anisotropic liquid crystals”, IEEE MTT-S Int. Microwave Sym/i., Vol. 2, 1153-1156, New Deli, 2004.
• 6. F. Goelden, A. Gaebler, O. Karabey, M. Goebel, A. Manabe, and R. Jakoby, “Tunable band-pass filter based in liquid crystal”, German Microw. Conf., pp. 98-101. Berlin, 2010.
• 7. R. Mao and X. Tang, “Novel dual-mode bandpass filters using hexagonal loop resonators”, IEEE T. Microw. Theory 54, 3526-3533 (2006).
• 8. S. Luo, L. Zhu and S. Sun, “A dual-band ring-resonalor bandpass filter based on two pairs of degenerate modes”, IEEE Trans. Microw. Theory Techn. 58, 3427-3432 (2010).
• 9. S. Li, H. Cai, W. Wu, Y. Li, and Z. Wang, “New dual-mode microstrip bandpass filter with a square notch", IEEE ICCT, 656658 (2010).
• 10. J. Torrccilla, E. Avila, C. Marcos, V. Urruchi, J.M. Sanchez-Pena, J. Arias, and M.M. Sanchcz-López, “Microwave tunable notch filter based on liquid crystal using spiral spurline technology” , Microwave Opt. Technol. Lett. 55, 2420-2423 (2013).
• 11. J. Torrccilla, E. Avila, C. Marcos, V. Urruchi, J.M. Sanchcz-Pena, J. Arias, and M.M. Sanchez-López, “Dielectric permittivity estimation of liquid crystals at microwave frequencies based on the characterization of a spiral spurline notch filter”, XXVIII Simposiun National Union Cientijica International de Radio URSI, Santiago, (2013).

Uwagi

EN

Authors acknowledge Centro de Materiales y Dispositivos Avanzados para TIC (Universidad Politecnica de Madrid) for the use of their facilities to manufacture the device. Authors thank funding support from Comunidad de Madrid (grant no. FACTOTEM2 S2009/ESP/1781) and the Spanish Ministerio de Economi'a y Competitividad (grant no. TEC2009-13991-C02-01).