Organic-based RF capacitors with ceramic-like properties Conference

Hwang, JH, Raj, PM, Abothu, IR et al. (2007). Organic-based RF capacitors with ceramic-like properties . 1866-1869. 10.1109/ECTC.2007.374052

cited authors

  • Hwang, JH; Raj, PM; Abothu, IR; Yoon, C; Iyer, M; Jung, HM; Hong, JK; Tummala, R

abstract

  • RF capacitor applications for filtering and signal matching need stringent tolerances in Temperature Coefficient of Capacitance (TCC) and Quality factor (Q). In this paper, the temperature dependence of the dielectric properties of polymer-ceramic composites was discussed, with particular emphasis on high Q polymers and paraelectric ceramic particles. This includes the important role of ceramic paraelectric particles such as Al2O3, SiO 2, Ta2O5 etc. as ceramic fillers and high Q polymers such as benzocyclobutene (BCB) in the development of high Q and low TCC dielectrics for embedded RF capacitors. High Q polymer by itself showed a negative TCC of about -250 ppm/ °C but the composite approach with Al 2O3, SiO2 and Ta2O5 fillers improved the TCC to -190, -130, +20 ppm/°C, respectively, between temperatures ranging from room temperature to 125°C. Liquid coatable high Q polymer-based composites with 3-4X improvement in dielectric constant and nearly-zero TCC of approximately within ±30 ppm/°C were developed with Ta2O5 as the inorganic filler. This effect can be ascribed to the TCC compensation between negative TCC of high Q polymer and the positive TCC of paraelectric ceramic particle selected. The distribution of the particles in the polymer matrix is also a crucial aspect of this application. ©2007 IEEE.

publication date

  • October 22, 2007

Digital Object Identifier (DOI)

International Standard Book Number (ISBN) 10

International Standard Book Number (ISBN) 13

start page

  • 1866

end page

  • 1869