Fabrication and characterization of two-pole X-band HgBa2CaCu2O6+δ microstrip filters

Abstract

Articles you may be interested inTriple-band high-temperature superconducting microstrip filter based on multimode split ring resonator

Fabrication of Three-Pole ${\rm HgBa}_{2}{\rm CaCu}_{2}{\rm O}_{6+\delta}$ Hairpin Filter and Characterization of Its Third Order Intermodulation

“…Sample degradation due to the photolithographic process can therefore be minimized. Recently, we have fabricated Hg-1212 two-pole X-band microstrip filters and showed lower insertion loss of 0.70 0.04 dB at 110 K than that of YBCO and Cu at 77 K [12]. These results have shown that Hg-1212 may present a promising alternative material for passive microwave applications at high operation temperatures above 77 K.…”

“…In addition, the sensitivity of the Hg-1212, when containing certain amount of impurity phases, to water or water-based chemicals used in the standard photolithography process makes processing of Hg-1212 devices challenging. With the development of a cation exchange process [14], [15], the fabrication and processing difficulties have been greatly eased and some interesting microwave properties have been demonstrated in Hg-1212 films and devices [3], [12], [13]. For example, it has been shown that Hg-1212 has a comparable microwave surface resistance and power handling capability at 110 K to that of YBCO and Tl-2212 at 77 K [3], [13].…”

Converting Hg-1212 to Tl-2212 via Tl–Hg cation exchange in combination with Tl cation intercalation

“…By translating the precursor's crystalline lattice to the Hg-HTS film, the major difficulties in epitaxy of Hg-HTS films, which is caused by the severe reaction of Hg vapour with substrates and the volatility of Hgrelated compounds, have been circumvented. Epitaxial Hg-1212 films on both oxide and metal substrates have been obtained with superior physical properties demonstrated for dc and rf applications [11][12][13][14]. Nevertheless, the microscopic mechanism of the cation exchange has been under debate and understanding this mechanism is of great importance to application of the cation-exchange method to other volatile compounds.…”

Double-sided Tl2Ba2Ca2Cu3O10 thin films based high temperature superconducting filter operating above 100 K

“…Up to date, two-pole X-band microstrip filter on a singlesided HgBa 2 CaCu 2 O 6þd (Hg-1212) film of 5 mm  10 mm could work at 110 K. 6 However, the growth of large-area epitaxial Hg-based HTS thin films with uniformity is difficult. Compared to the Hg-based HTS thin films, large-area doublesided Tl-based HTS thin films (Tl-2212) have been prepared successfully on different substrates.…”