Comparison of dipole, bowtie, spiral and log-periodic IR antennas

    Authors

    F. J. Gonzalez;G. D. Boreman

    Comments

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    Abbreviated Journal Title

    Infrared Phys. Technol.

    Keywords

    microbolometer; infrared antennas; antenna efficiency; antenna-coupled; detectors; Instruments & Instrumentation; Optics; Physics, Applied

    Abstract

    Antenna-coupled microbolometers use planar lithographic antennas to couple infrared radiation into a bolometer with sub-micron dimensions. In this paper four different types of infrared antennas were fabricated on thin grounded-substrates and coupled to microbolometers. Dipole, bowtie, spiral and log-periodic IR antenna-coupled detectors were measured at 10.6 μ m and their performance compared. A new method to calculate the radiation efficiency based on the spatial and angular response of infrared antennas is presented and used to evaluate their performance. The calculated radiation efficiency for the dipole, bowtie, spiral and log-periodic IR antennas was 20%, 37%, 25% and 46% respectively. A dipole-length study was performed and shows that the quasistatic value of the effective permittivity accurately describes the incident wavelength in the substrate at infrared frequencies for antennas on a thin substrate. © 2004 Elsevier B.V. All rights reserved.

    Journal Title

    Infrared Physics & Technology

    Volume

    46

    Issue/Number

    5

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    418

    Last Page

    428

    WOS Identifier

    WOS:000229553800010

    ISSN

    1350-4495

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