Wideband linear and dual-polarized antenna based on Huygens' source principle

Abstract

A Huygens source principle is used to design a wideband antenna. An electric dipole and a slot are located above a ground plane to have unidirectional broadside radiation with high front to back ratio. A symmetry radiation patterns are obtained. Linear and dual polarized antennas are designed and tested. The antennas achieve more than 50% bandwidth for both cases. The dually polarized antenna achieves around 30 dB isolation between the two ports.

Design and Testing of Simple, Electrically Small, Low-Profile, Huygens Source Antennas With Broadside Radiation Performance

“…Its simulated directivity is 4.70 dBi, which was very close to the maximum analytical value: 4.77 dBi [36]. In contrast to the electrically large Huygens source antennas reported in [41] and [43] which have a 1.33×1.33 λ 0 2 radiating cross-section, the one introduced here is only 0.0329 λ 0 2 in transverse size, a 53.80 times reduction. Similarly, in contrast to the electrically large magnetoelectric dipole antenna reported in [42] whose radiating cross-section is 0.63×0.41 λ 0 2 , it is 7.86 times smaller.…”

“…Fig. 3 Orthogonal design concepts of a Huygens source antenna that radiate along the +Z-axis as their broadside direction [35], [40], [41], [44], [46]. The electric and magnetic fields due to electric dipole are labeled: E e , H e ; those due to the magnetic dipole are labeled: E m , H m .…”

“…Fig. 9 Design concept of the Huygens source antenna with broadside radiation along the -Z-axis [35], [40], [41], [44], [46]. Consequently, the same configuration shown in Fig.…”

“…On the other hand, the magnetoelectric dipole antennas [40]- [43], due to the inherent physical mechanisms of each of their electric and magnetic dipole combinations and the presence of the associated ground plane, inescapably make their electrical size not small (i.e., ka = 2πa/λ 0 > 1.0, where a is the radius of the smallest sphere that completely encloses the entire antenna system at λ 0 [9]). For example, the indispensable large ground plane needed to decrease the patch size and produce the equivalent magnetic dipole behavior in [41,43] yields an antenna that has ka~5.91; and the requisite 180° phase delay between the two slots of the antenna reported in [42] makes the entire system ka~2.66.…”

Wideband Magnetic-Electric Antenna With Linear Single or Dual Polarization

“…In this paper, the proposed structure makes a dielectric substrate that supports the microstrip line outside the parallel plate region and behind the dipole. As such, the dielectric does not contribute to radiation of the antenna [13], which causes a reduction in the antenna bandwidth and efficiency. In addition, such a structure simplifies the excitation mechanism and at the same time retains excellent characteristics of the wideband complementary antenna element.…”