Patent ID: 8847600

Claim:
An apparatus for estimating a property of an earth formation penetrated by a borehole, apparatus comprising: a carrier configured to be conveyed through the borehole; a transducer disposed at the carrier and configured to transmit and/or receive electromagnetic energy into and/or from the earth formation to estimate the property; wherein: the transducer comprises a plurality of inductively coupled elements in a series, each element configured to transmit and/or receive electromagnetic energy, and at least a first connection to a first element in the plurality and a second connection to a second element in the plurality with at least one of the first element and the second element being disposed between end transducer elements in the series; each element in the plurality of inductively coupled elements is electrically connected to an adjacent element; and the second connection is configured as a changeable connection that is configured to couple to fixed taps or to slide continuously the elements or a combination thereof.