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Highly Directive Lens-Less Photoconductive Dipole Antenna Array for Imaging Applications

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Terahertz Antenna Technology for Imaging and Sensing Applications

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Abstract

In this chapter, a highly directive small-gap photoconductive dipole array antenna is presented for imaging system operating at terahertz frequencies. The array antenna is formed on a single photoconductive substrate to make it compact and suitable for terahertz imaging applications. The presented photoconductive dipole array antenna improves the gain as well as directivity; therefore, it is useful to enhance the imaging capabilities to address the considerations such as limited depth-of-field (DoF), that is, the distance over which an object is considered in focus, and size, weight, and power (SWaP) of terahertz source for imaging applications. These are important considerations for applications such as standoff imaging and surveillance of moving targets where the high angular resolution as well as extended DoF is the key for successful detection of hidden explosives and illicit drugs. In addition to this, a technique of using frequency selective surface with photoconductive array antenna is also presented to further enhance the directivity of the radiating structure to yield high image resolution. Moreover, by using this technique, the radiation energy has been confined to the desired frequency band rather than spreading over a wide spectrum range.

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Authors and Affiliations

  1. Electronics and Communication Engineering, Dronacharya College of Engineering, Gurugram, Haryana, India

    Isha Malhotra

  2. Electrical and Electronics Engineering Science, University of Johannesburg, Johannesburg, South Africa

    Ghanshyam Singh

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  1. Isha Malhotra
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  2. Ghanshyam Singh
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Malhotra, I., Singh, G. (2021). Highly Directive Lens-Less Photoconductive Dipole Antenna Array for Imaging Applications. In: Terahertz Antenna Technology for Imaging and Sensing Applications. Springer, Cham. https://doi.org/10.1007/978-3-030-68960-5_7

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  • DOI: https://doi.org/10.1007/978-3-030-68960-5_7

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-68959-9

  • Online ISBN: 978-3-030-68960-5

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