Alignment procedure for radiation pattern measurements of antenna-coupled infrared detectors

Krenz, Peter M.

doi:10.1117/1.3365959

Cited by 8 publications

(4 citation statements)

References 13 publications

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“…A CO 2 laser operating at 10.6 μm is chopped at 1.5 kHz and focused at F/8 onto the antenna, which is connected to a five axis goniometer [25]. The device is connected to a current preamplifier and monitored with a lock-in amplifier that is referenced to the frequency of the mechanical chopper.…”

Section: Resultsmentioning

confidence: 99%

Directional control of infrared antenna-coupled tunnel diodes

Slovick¹,

Bean²,

Krenz³

et al. 2010

Opt. Express

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Directional control of received infrared radiation is demonstrated with a phased-array antenna connected by a coplanar strip transmission line to a metal-oxide-metal (MOM) tunnel diode. We implement a MOM diode to ensure that the measured response originates from the interference of infrared antenna currents at specific locations in the array. The reception angle of the antenna is altered by shifting the diode position along the transmission line connecting the antenna elements. By fabricating the devices on a quarter wave dielectric layer above a ground plane, narrow beam widths of 35° FWHM in power and reception angles of ± 50° are achieved with minimal side lobe contributions. Measured radiation patterns at 10.6 μm are substantiated by electromagnetic simulations as well as an analytic interference model.

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Section: Resultsmentioning

confidence: 99%

Directional control of infrared antenna-coupled tunnel diodes

Slovick¹,

Bean²,

Krenz³

et al. 2010

Opt. Express

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show abstract

“…The laser is mechanically chopped at 1.5 kHz and focused at F/8 onto the phased-array antenna, which is connected to a five-axis goniometer [20]. The rectified current from the diode is passed through an external current preamplifier and monitored with a lock-in amplifier that is referenced to the frequency of the mechanical chopper.…”

Section: Resultsmentioning

confidence: 99%

Angular Resolution Improvement of Infrared Phased-Array Antennas

Slovick

Bean

Boreman

2011

Antennas Wirel. Propag. Lett.

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Measured and simulated angular response patterns at 10.6 m demonstrate considerable improvement in angular resolution with a four-element phased-array antenna versus that of a two-element array. Due to propagation loss in the transmission line that connects the antenna elements, further resolution improvement is minimal with a six-element phased array. Additional measurements of a two-element array with increased metal thickness indicate that further improvement in angular resolution is possible by reducing propagation loss in the transmission line. With the combination of additional antenna elements and reduced propagation loss, substantial improvement in the angular resolution of off-broadside performance is also observed. All devices use a metal-oxide-metal tunnel diode as the detector element.Index Terms-Dipole antennas, directional antennas, infrared detectors, phased arrays.

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“…In this configuration, the Fraunhofer diffraction pattern of the spatially incoherent field is generated in the focal plane of the F/1 lens [22]. The phased-array antenna is mounted to a five-axis goniometer located in the focal plane of the F/1 lens [23]. The rectified current from the MOM diode is passed through an external current preamplifier and monitored with a lock-in amplifier that is referenced to the frequency of the mechanical chopper.…”

Section: Fabrication and Measurementmentioning

confidence: 99%

Infrared antenna measurement of the spatial coherence function

Slovick¹,

Bean²,

Florence³

et al. 2011

Opt. Express

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The degree of coherence of a partially coherent monochromatic optical field is measured with a dual-dipole phased-array antenna coupled to a metal-oxide-metal tunnel diode detector. For a two-element phased-array, the degree of coherence is a measure of the correlation of electric fields received by the antennas as a function of the element separation. To extract the coherence function from the measured antenna response, a calibration method is developed to remove propagation loss and device nonuniformity. Measurements at 10.6 µm are substantiated by electromagnetic simulations and compared to the result derived from the Van Cittert-Zernike theorem.

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Alignment procedure for radiation pattern measurements of antenna-coupled infrared detectors

Cited by 8 publications

References 13 publications

Directional control of infrared antenna-coupled tunnel diodes

Directional control of infrared antenna-coupled tunnel diodes

Angular Resolution Improvement of Infrared Phased-Array Antennas

Infrared antenna measurement of the spatial coherence function

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