Title

Comparison Of Dipole, Bowtie, Spiral And Log-Periodic Ir Antennas

Keywords

Antenna efficiency; Antenna-coupled detectors; Infrared antennas; Microbolometer

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 μm 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 right reserved.

Publication Date

6-1-2005

Publication Title

Infrared Physics and Technology

Volume

46

Issue

5

Number of Pages

418-428

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.infrared.2004.09.002

Socpus ID

18444371455 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/18444371455

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