A miniaturized bandpass filter fabricated on high dielectric constant ceramic substrates

Abstract

A four‐pole open‐loop resonator bandpass filter fabricated on high dielectric constant (Zn0.9Mg0.1)TiO3 ceramic substrates is presented. The full‐wave simulator IE3D is utilized to calculate the coupling coefficients of each basic coupling structure and simulate S‐parameters of the designed bandpass filters. The center frequency of designed bandpass filter is fo = 2.45 GHz and the fractional bandwidth is 4%. The center frequency of the fabricated bandpass filter is at 2.47 GHz and the fractional bandwidth is 5%. The measured insertion loss and return loss of the filter is −3.68 and −14.92 dB, respectively. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2087–2090, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22698

Wide‐band double‐ring resonator with transmission zeros and resonances using high permittivity aluminum nitride substrate

“…The bias points of the active mixer transistors were optimized to maximize the efficiency and to obtain an adequate conversion gain. For the FETs of the resistive mixer, the bias point should be adjusted to minimize the conversion loss [5].…”

“…In the recent years, much more passive devices of wideband are intensively investigated and a number of compact wideband filters have been proposed. Especially, using high permittivity substrates are the new research topic, such as Arlon 25FR [1], Al 2 O 3 ceramic [2,3], Al 2 O 3 and 85MZCLT ceramic [4], (Zn 0.9 Mg 0.1 )TiO 3 ceramic [5], Zr 0.8 Sn 0.2 TiO 4 ceramic [6], multilayer liquid crystal polymer [7], MGTA 1.5 NB 0.5 O 6 ceramic [8], Al 2 O 3 and 9MCT-CLT with V 2 O 5 [9], Al 2 O 3 and 0.8(Mg 0.95 Zn 0.05 )TiO 3 -0.2Ca 0.61 Nd 0.26 TiO 3 [10], and Al 2 O 3 and 94MCT þ V 2 O 5 [11] substrates.…”