Crossed Dipole Loaded With Magneto-Electric Dipole for Wideband and Wide-Beam Circularly Polarized Radiation

Abstract

A crossed dipole that is loaded with a magneto-electric dipole to produce the wideband and wide-beam circularly polarized radiation characteristics is proposed. The crossed dipole is incorporated with double-printed vacant-quarter rings to feed the antenna. The antenna is backed by a metallic cavity to provide a unidirectional radiation pattern with a wide axial-ratio (AR) beamwidth and a high front-to-back ratio. Experimental results showed that the prototype with an overall size of mm has a dB bandwidth of 1.274-2.360 GHz and a 3-dB AR bandwidth of 1.39-1.82 GHz. The antenna showed a right-hand circular polarization (CP) radiation with a very wide 3-dB AR beamwidth ( ) and a high radiation efficiency ( ) within the operational bandwidth.

Compact Wide-Beam Circularly Polarized Antenna With Stepped Arc-Shaped Arms for CNSS Application

“…Using two pairs of radiators in square contour, 3 dB AR beamwidths of 126 • [13] and 175 • [14] are obtained, respectively. However, gains in [9][10][11][12][13][14] at 5 • elevation angle are all less than −3 dBic. In order to improve the gain at low elevation angle, some techniques have been put forward in [1,[15][16][17].…”

“…Some improved crossed dipoles are studied to broaden the beamwidth. Antennas in [8][9][10] have beamwidths of 180 • , 170 • , and 160 • , respectively. However, these antennas are bulky because they use power divider [8] and metallic cavities [9,10].…”

“…Antennas in [8][9][10] have beamwidths of 180 • , 170 • , and 160 • , respectively. However, these antennas are bulky because they use power divider [8] and metallic cavities [9,10]. Besides, microstrip antennas with a three-dimensional square ground [11] and four unequal circular patches integrated symmetrically onto corners [12] are proposed, whose 3-dB AR beamwidths are improved up to 113 • and 180 • , respectively.…”

Microstrip Magnetic Dipole Yagi Antenna With Enhanced Impedance Bandwidth and Reduced Size for Wideband Wireless Applications

“…Microstrip magnetic dipole Yagi antennas have attracted great attention due to their merits of simplicity in structure, low profile, light weight, low fabrication cost, broad bandwidth, realizing unidirectional radiation with high gain and vertical polarization, and suitability for integration with microwave circuits [1][2][3][4][5][6][7][8]. With the inherent vertical polarization characteristic, when microstrip magnetic dipole Yagi antennas are employed in the communication systems on a horizontal platform, such as ground-wave communications, transmitter and receiver can keep the same vertical polarization for good connection when the transmitter or receiver rotates on the platform.…”

Compact Circularly Polarized Crossed Dipole Antenna With Chip Inductors and Square Rings Loading for GPS Applications

“…In [9], crossed dipoles consist of a top-loaded triangular and a filleted rhombic to achieve the required input impedance relations for CP radiation. In [10][11][12][13][14][15], CP radiation is produced by crossing two dipoles through a 90 • phase delay line of a vacant-quarter printed ring. Particularly in [15], the antenna employs insertion of meander lines in the dipole arms and shaping of the dipole arm end into arrowhead subtly to obtain a compact size for GPS application, whose plane dimension is 42 mm × 42 mm.…”