An Ultrawideband Conformal Capsule Antenna With Stable Impedance Matching

Keywords

Conformal capsule antenna; inner wall; slot antenna; wideband

Abstract

An ultrawideband conformal capsule slot antenna, which has a simple configuration and a stable impedance matching characteristic, is described in this paper. In the past, wideband outer-wall antennas have been proposed for capsule-type applications. However, this paper shows that the outer wall is not a good choice for placing capsule antennas, since such a choice exhibits a high specific absorption ratio, low gain, and low efficiency. Instead, the antenna proposed in this paper is conformal to the inner wall of a capsule shell, and it provides a wide impedance bandwidth ranging from 1.64 to 5.95 GHz (113.6%). Furthermore, the impedance matching remains stable even with a change in the operating environment. Since in a typical application scenario a capsule will move through the digestive system, and thus experience varying environments, a wide bandwidth and stable performance are both very desirable attributes of the antenna, whose design is discussed in this paper. Moreover, the proposed antenna continues to maintain a stable impedance match even when a battery is added inside the capsule, or when there is a change in the battery size and/or its position. Given these advantages, we argue that slot antennas are well suited for incorporation into capsule antennas for the present application.

Publication Date

10-1-2017

Publication Title

IEEE Transactions on Antennas and Propagation

Volume

65

Issue

10

Number of Pages

5086-5094

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/TAP.2017.2741027

Socpus ID

85028512053 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85028512053

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