High-Efficiency Angled-Dipole Antennas for Millimeter-Wave Phased Array Applications

A high-efficiency microstrip-fed endfire angled-dipole antenna has been developed for millimeter-wave phased array applications. The antenna is built on both sides of a Teflon substrate (epsiv r = 2.2) and this allows a wideband feed from the single-ended microstrip line to the differential dipole....

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2008-10, Vol.56 (10), p.3136-3142
Main Authors: Alhalabi, R.A., Rebeiz, G.M.
Format: Article
Language:English
Subjects:
24 GHz
60 GHz
Antenna arrays
Antenna feeds
Antennas
Applied sciences
Automotive components
automotive radars
Broadband antennas
Dipole antennas
Efficiency
Exact sciences and technology
Gain
Ground plane
Linear antenna arrays
Microstrip antenna arrays
Microstrip antennas
Microstrip lines
Millimeter wave communication
millimeter-wave (mm-wave) antenna arrays
millimeter-wave antennas
millimeter-wave communication systems
Mutual coupling
Noise levels
Phased arrays
planar antennas
Radar systems
Radiocommunications
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
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Summary:A high-efficiency microstrip-fed endfire angled-dipole antenna has been developed for millimeter-wave phased array applications. The antenna is built on both sides of a Teflon substrate (epsiv r = 2.2) and this allows a wideband feed from the single-ended microstrip line to the differential dipole. The design results in wide radiation patterns for scanning purposes with a gain of around 2.5 dB at 20-26 GHz and a cross-polarization level of < -15 dB at 24 GHz. A mutual coupling of < -23 dB is measured between adjacent elements with 6.8 mm center-to center spacing (0.50-0.54 lambda 0 at 22-24 GHz). A variant of the angled-dipole antenna with a magnetic ground plane edge was also developed, and shows a measured gain of > 6 dB at 23.2-24.6 GHz and very low mutual coupling between elements ( 93% when referenced to the microstrip line feed (including mismatch loss). The usefulness of these antennas as phased array radiators is demonstrated by several eight-element linear arrays at 22-24 GHz with scan angle up to 50 degrees. The application areas are in automotive radars and high data-rate communication systems.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2008.929506