Abstract
When a magnetic current antenna is parallel to a metal ground, it can produce a nearly 180° 3dB beamwidth in the E plane, which can achieve a wide-angle scanning range in the E plane. But the bandwidth of an equivalent magnetic current antenna is usually narrow. Therefore, we propose a self-complementary tightly-coupled dipole array (SC-TCDA) to achieve a wide-band magnetic current antenna, which has a wide-angle scanning range. A reflective cavity is added below the SC-TCDA. And a wide-angle impedance matching (WAIM) layer is added on the SC-TCDA. For an infinite array, the SC-TCDA can work over the band of 1.85-6.05 GHz (VSWRs<; 2.5) at the broadside, scan to ±80° in the E plane over the band of 2.2-5.95 GHz (VSWRs<; 2.5), ±40° in the H plane over the band of 1.9-6 GHz (VSWRs<; 2.5), and ±70° in the D plane over the band of 1.85-6.15 GHz (VSWRs<; 2.5). The efficiencies in different planes are greater than 80% for an infinite array. The profile of the proposed SC-TCDA is only 0.14 wavelengths at 2.2 GHz. An SC-TCDA with $16\times16$ elements is fabricated and measured. The measured and simulated results are in good agreement.
Highlights
There is a great demandfor phased arrays at present in the military and civilian areas, especially for the wide-band and wide-angle scanning phased arrays
The calculated results show that the slot array can achieve a bandwidth of 40% when scanning to 70◦ in the E plane
In Ref. [7], a dielectric lens was loaded above the connected slot array antenna, which achieved a 3:1 bandwidth and about ±30◦ scanning range
Summary
There is a great demandfor phased arrays at present in the military and civilian areas, especially for the wide-band and wide-angle scanning phased arrays. A narrow band, and the phased array achieved a scan range of ±77◦ over the band of 5.73-5.97 GHz. the above equivalent magnetic current antenna can realize wide-angle scanning in the E plane, the bandwidth is relatively narrow. [6], a slot array with an ideal feeding network was used to achieve a wide-band and wide-angle scanning. [7], a dielectric lens was loaded above the connected slot array antenna, which achieved a 3:1 bandwidth and about ±30◦ scanning range. A self-complementary tightly-coupled dipole array (SC-TCDA) is proposed, which can scan to ±80◦ in the E plane.
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