Correction: Mariappan, S.G. et al. Polymer Magnetic Composite Core Based Microcoils and Microtransformers for Very High Frequency Power Applications. Micromachines, 2016, 7, 60

Saravana Guru Mariappan; Ali Moazenzadeh; Ulrike Wallrabe

doi:10.3390/mi7060100

In the published paper [1], there are two errors in Table 5, both of which correspond to the reported results of a paper authored by Macrelli et al. in 2014 [48]. The correct value of the inductance per DC resistance of this paper is 73256 nH

/ Ω

, and the correct value of the core volume is 4.32 mm

^{3}

. Therefore, Table 5 should read as follows:

Table 5. Survey on the state of the art microtransformers (pure RF microinductors are excluded). All the devices except the ones which marked with (*) were characterized using 50 Ω load.

The authors apologize for any inconvenience caused by these errors. The manuscript will be updated online and the previous version will remain available on the article webpage.

Reference

Mariappan, S.G.; Moazenzadeh, A.; Wallrabe, U. Polymer Magnetic Composite Core Based Microcoils and Microtransformers for Very High Frequency Power Applications. Micromachines 2016, 7, 60. [Google Scholar] [CrossRef]

Table 5. Survey on the state of the art microtransformers (pure RF microinductors are excluded). All the devices except the ones which marked with (*) were characterized using 50 Ω load.

**Table 5.** Survey on the state of the art microtransformers (pure RF microinductors are excluded). All the devices except the ones which marked with (*) were characterized using 50 Ω load.
Refferences	Citation	L/ $R_{D C}$	$η_{m a x}$	$F_{η m a x}$	κ	Core Volume	Layout	Core Material
Refferences	Citation	(nH/Ω)	(%)	(MHz)	(%)	(mm $^{3}$ )	Layout	Core Material
Rassel et al., 2003	[37]	100	10 $^{*}$	0.5	90	0.025	Solenoid	NiFe
Yamaguchi et al., 1993	[38]	357	29 $^{*}$	20	90	3.77	Planar	CoFeSiB
Allen et al., 2003	[39]	371	32	26	85	3.99	Planar	NiFe
Meyer et al., 2010	[40]	52.6	40	50	63	-	Stack planar	Air
Brunet et al., 2002	[41]	900	40 $^{*}$	2	-	1.45	Planar	NiFe
Xu et al., 1998	[42]	720	45	10	90	0.520	Solenoid	NiFe
Sakakibara et al., 1996	[43]	106	50	10	93	10	Planar	CoZrRe
Kurata et al., 1994	[44]	24	50	100	92	0.042	Solenoid	CoFeSiB
Tang et al., 2001	[45]	154	63	8	95	-	Planar	Air
Wang et al., 2007	[8]	840	63	10	93	0.355	Planar	NiFe
Raimann et al., 2012	[11]	142.3	65	45	86	1.6	Solenoid	Ferrite
Moazenzadeh et al., 2013	[15]	175.6	68	54	94	0.674	Solenoid	Air
Moazenzadeh et al., 2014	[16]	5714	71	1.11	98	7.5	Solenoid	CoFeNiSiB
Moazenzadeh et al., 2013	[46]	395	74	32	98	0.720	Solenoid	CoFeNiSiB
Wu et al., 2015	[47]	195.5	-	-	98	0.2	Planar	Air
Macrelli et al., 2014	[48]	73256	-	-	90	4.32	Toroid	MnZn
Khan et al., 2015	[49]	16.2	∼55	-	75	0.044	Fractal shaped	Air
Tra_10_W65 *	This work	158	84	61	96	1.6	Solenoid	NiFeZn+epoxy

* Tra_X_WY represents the transformer made of X number of turns in primary and secondary coil wound around the composite core made of Y% of magnetic powder.

© 2016 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license ( http://creativecommons.org/licenses/by/4.0/).

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