An impedance transformer (IT) with a ultra-high impedance transforming ratio (UHITR) is presented in this letter. The UHITR is obtained by controlling coupling coefficients of cascaded open-circuited coupled lines. Two transmission poles have appeared in the passband for an under-matched region. For the validation, the IT with impedance transforming ratio of 10 was designed at a center frequency of 2.6 GHz. From the experiment, insertion and return losses at were determined as 0.55 dB and 21.47 dB, respectively. Within the operating band from 2.515 to 2.73 GHz, the insertion and return losses were better than 0.8 dB and 18 dB, respectively. The out-of-band suppression characteristics are higher than 20 dB from dc to 1.92 GHz and better than 18 dB from 3.28 to 7.2 GHz.
DBPA shows better performance at the two bands simultaneously compared with the prior works.
CONCLUSIONIn this article, a novel and simple concurrent DB matching technique is proposed. By combining a traditional single-band MN with a DSL-based network in cascade, the impedance matching can be realized simultaneously at two distinct bands. The fabricated DBPA achieves almost same performance at the two bands. The proposed DB matching technique could be easily extended to the concurrent triband and even MB applications by adding a triband/MB DSL-based network to the right side of the proposed DBMN.
parameter prediction with an effective fitting error of e P 5 10.69%.
CONCLUSIONFrom the proposed small-signal model based on the CPW deembedded submodel method, reliable parasitic parameter sets were successfully extracted at various effective gate widths (20-140 mm) of the 0.1-mm MHEMTs in our frequency range of 0.5-110 GHz. This extraction method gave the best extraction accuracy in terms of the S-parameter prediction among the models reported to date with a e N of 11.22% without optimization and a further enhanced e P of 10.69% when the R ch optimization scheme was used.
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