Abstract
This paper presents a low-profile log-periodic meandered dipole array (LPMDA) antenna with wideband and high gain characteristics. The antenna consists of 14 dipole elements. For compactness, a meander line structure is applied to each dipole element to reduce its physical length. As a result, a compact and wideband LPMDA antenna is realized, exhibiting a wide impedance bandwidth of 1.04–5.22 GHz (ratio bandwidth of 5.02:1) for || < −10 dB. To enhance the antenna gain performance while maintaining the wideband behavior, the LPMDA antenna is integrated with a new design of an artificial magnetic conductor (AMC) structure. The designed AMC is realized by combining three AMC structures of different sizes to form a cascaded multi-section AMC structure, of which its overall operating bandwidth can continuously cover the entire impedance bandwidth of the LPMDA antenna. The proposed AMC-backed LPMDA antenna is experimentally verified and its measured −10 dB reflection bandwidth is found to be in the range of 0.84–5.15 GHz (6.13:1). At the main beam direction within the operating frequency bandwidth, the gain of the proposed AMC-backed LPMDA antenna ranges from 7.15–11.43 dBi, which is approximately 4 dBi higher than that of an LPMDA antenna without an AMC. Moreover, the proposed antenna has a low profile of only 0.138. ( is the free-space wavelength at the lowest operating frequency).
Highlights
The rapid development of modern wireless communication systems has increased the demand for wideband and high-gain antennas [1,2,3,4]
We propose a low-profile, high-gain, and wideband log-periodic meandered dipole array (LPMDA) antenna with an artificial magnetic conductor (AMC) backing
Our proposed AMC-backed LPMDA antenna has a low profile of 0.138λ L, a very wide ratio bandwidth of 6.13:1 for |S11 | < −10 dB, and a high gain exceeding 7.15 dBi over the entire operating frequency band, demonstrating its potential to be useful for aircrafts, missile, and unmanned aerial vehicles (UAVs)
Summary
The rapid development of modern wireless communication systems has increased the demand for wideband and high-gain antennas [1,2,3,4]. An H-plane ridged substrate-integrated waveguide (SIW) horn antenna mounted on a large ground plane was introduced [12] This antenna provided a wide bandwidth of 2.73:1 with a VSWR of less than 2.5 by employing an arc-shaped horn aperture loaded with a dielectric material and a wideband coaxial probe to three-step ridged SIW transition. Our proposed AMC-backed LPMDA antenna has a low profile of 0.138λ L , a very wide ratio bandwidth of 6.13:1 for |S11 | < −10 dB, and a high gain exceeding 7.15 dBi over the entire operating frequency band, demonstrating its potential to be useful for aircrafts, missile, and UAVs. In this study, the commercially available software ANSYS high-frequency structure simulator (HFSS) is used to conduct all of the simulations. The following sections describe in detail the antenna geometry and discuss the experimental results to verify the feasibility of the proposed antenna
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