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Electrically small Huygens dipole antennas are reported that are low profile, broadside radiating, have high radiation efficiencies, and are either linear (LP) or circularly (CP) polarized. The Huygens behavior, i.e., a high front-to-back ratio with a cardioid-like pattern, is realized by exciting two (LP) or two pairs (CP) of complementary electric and magnetic dipole radiators, simultaneously having...
In this paper, a miniaturized wideband dual-polarized antenna loaded with parasitic loops and straight dipoles has been proposed for 2G/3G/4G base-station applications. Firstly, by loading four parasitic loops to the corners of regular crossed loop dipoles, a miniaturized structure and enhanced impedance bandwidth can be obtained. Then, based on the miniaturized structure, two straight dipoles are...
A compact log periodic antenna (LPDA) is presented in this paper. In this paper, a slotted second iteration of LPDA is demonstrated for size reduction that used for UHF digital TV band application. The proposed antenna operates from 0.5GHz to 1.5GHz for the reflection coefficient ≤ −10dB and maintain the gain of more than 5dBi. The antenna is designed on FR4 Epoxy dielectric substrate with the thickness...
The development of left-handed circularly polarized (LHCP) X-band printed antenna for microsatellite data communication is presented. The antenna which takes a circular shape with ellipse-shaped truncation is designed to resonate at the frequency of 8.2GHz with the minimum axial ratio bandwidth of 400MHz. The proposed antenna is deployed on a 1.6mm thick NPC-H220A dielectric substrate. The realized...
In this paper, the size of a log-periodic dipole array antenna is reduced using partially applied folded planar helix dipole elements. The proposed antenna shows almost no gain deterioration in the entire operating bandwidth even though its size is reduced by 39 %. Due to its reduced size and lightweight characteristics, it is expected that the proposed antenna could be effectively utilized in the...
With compact folded method, a kind of folded crossed dipole ultra wideband antenna is proposed with omnidirectional radiation characteristics on the horizontal direction in this paper. The antenna is comprised of orthogonal crossed semicircular metal discs with twice 90° folded on both ends. Horizontal size is reduced obviously compared with original crossed semicircular disc antenna. This antenna...
Scattering performance of a reflectarray using a log-periodic dipole array (LPDA) element is demonstrated numerically and experimentally. The LPDA element and the reflectarray are designed using method of moments (MoM). The designed 10 × 1 reflectarray was fabricated using a 3D printing technology. A bistatic radar cross section (BRCS) of the designed reflectarray was measured in a radio anechoic...
Integrating the concept of Antipodal Vivaldi antenna (AVA) and planar disc-shaped dipole, a half space radiation UWB antenna is proposed in this letter. The antenna adopted approximately 1/4 of the disc-shaped dipole as its radiator, fed by the AVA's exponential slot structure. The proposed antenna has an ultra-wide bandwidth and nearly half space radiation pattern. This character makes it applicable...
A compact square-shaped circularly polarized antenna is presented for pico-satellite application. Four dipole antennas are integrated with a phase delay line on a Rogers RO4003C to operate at 2.4 GHz with a dimension of 0.724λg (55mm) × 0.724λg (55mm) × 0.0112λg (0.85mm) based on the lowest guided wavelength. Reflection and radiation performance exhibited are acceptable, with an impedance bandwidth...
This Antenna Sensor for partial discharge (PD) detection has been widely proven in Gas-Insulated Substation (GIS) monitoring. The electromagnetic wave produced from PD activity which occurs at a frequency of 300 MHz to 3000 MHz This paper present design of the long bowtie antenna. Its development from the original bowtie antenna to acquire more bandwidth. Simulation using the finite element method...
This paper proposes a new frequency selective surface (FSS) using interdigital slot structure. By using the interdigital slot unit cell, the size can be reduced from A/2 of conventional one to A/8. Moreover, the proposed interdigital slot FSS can be applied with a dipole antenna to resonate at 1.8 GHz, resulting in a high gain of 8.43 dB. The radiation pattern is directional and bandwidth is about...
This paper presents artificial magnetic conductor (AMC) structure employed for low-profile antenna operates in Wi-Fi 5 GHz band for wearable internet of things (IoT) devices. A proposed AMC structure comprises of a combination of ring slots. This structure can improve the impedance bandwidth of a planar dipole antenna when the size of AMC surface is approximately half wavelength. The simulation results...
A planar reversed log-periodic near-field antenna is proposed for ultra-high frequency (UHF) radio frequency identification (RFID) application in this letter. The proposed antenna is composed of two planar reversed log-periodic dipole antenna (LPDA) units. The concept of two closely spaced, oppositely directed currents (ODCs) and the design guideline of LPDA are adopted to achieve strong and uniform...
A broadband circularly polarized antenna with wide axial-ratio beamwidth utilizing a wideband power divider network is presented. The vertical and horizontal paired-dipoles are used as the antenna elements, which are excited by a 1-to-4 sequential broadband feeding network. Through a rational design of the spacing between two parallel dipoles and the feeding network, an antenna with broad impedance...
A coax-feed low profile dual-polarized circular patch antenna with high impedance surface (HIS) reflector is presented. The proposed antenna contains two pairs of H-shaped slots on the two bow-tie shaped patches separately, which keep the cross polarization under −39 dB. By introducing two short pins, the isolation between the two ports remains more than 40 dB in the whole bandwidth. Low profile and...
A substrate integrated waveguide (SIW) H-plane horn antenna loaded with dipole array is proposed. The horn antenna works with the gain from 9.0 to 11.7 dBi, high front-to-back ratio and stable radiation patterns in the entire Ka-band.
A wideband microstrip endfire antenna is designed for applications in base station and satellite communication. Utilizing substrate integrated waveguide technology, vertically polarized wave is generated by the driven element of the antenna. And a parasitic microstrip patch with one edge opened and the other three edges shorted is introduced as the magnetic dipole to improve the impedance matching...
A 28 GHz, planar, electrically small Huygens source antenna is presented. The proposed antenna is composed of electric Egyptian axe dipole (EAD) and magnetic capacitively loaded loop (CLL) near-field resonant parasitic (NFRP) elements with a coax-fed dipole radiator. It has broadside radiating and planar performance characteristics. To confirm its efficacy for on-body applications, the specific absorption...
A low-profile wideband unidirectional dipole antenna with U and L-shaped slots loaded is proposed. A prototype with a thickness of 0.175λ was fabricated and measured. The proposed antenna achieves a wide impedance bandwidth of 57% (S11≤ −10 dB) from the frequency of 1.56 to 2.79 GHz. The cross polarization is less than −21 dB over the operating bandwidth. The antenna has an average gain of 8.6 dBi...
A novel polarization reconfigurable aperture-coupled magneto-electric (ME) dipole antenna is presented. By electronically controlling the state of switches between square patches and an additional strip of the ME dipole, the antenna is capable of switching the polarization among one linearly polarized (LP) and two orthogonal circularly polarized (CP) states. An overlapped bandwidth of 16% from 5.07...
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