Design of a 3-D Integrated Wideband Filtering Magneto-Electric Dipole Antenna
2019
A new design of 3-D integrated wideband filtering magneto-electric dipole antenna with high selectivity is presented. The proposed antenna is mainly composed of a horizontal planar dipole and a vertically oriented shorted patch antenna. A pair of C-slots is etched on the planar dipole to obtain sharp skirt selectivity near both band-edges. In addition, a slotline loaded with the patch antenna provides good impedance matching. The proposal exhibits a quasi-elliptic gain response with three introduced radiation nulls without additional filtering circuits. To verify the design concept, a prototype is fabricated and measured. The result exhibits an impedance bandwidth of 55.4% with $\text {SWR}\le 1.5$ from 1.58 to 2.79 GHz. Moreover, the low back radiation levels (
${\le } -16$ dB), stable radiation patterns with low cross polarization levels (
${\le } -26$ dB), and an average antenna gain of 7.8 dBi are achieved within the operating band. In addition, an out-of-band suppression level, better than 17 dB, is reached.
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