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A novel main beam angle control microstrip antenna is designed and fabricated by loading a monolayer transmissive phase gradient metasurface (PGM). The anomalous refraction effects of the PGM are able to introduce predefined wave vector to control the radiation direction. The resonant frequencies of the four different PGM loaded antennas are kept at 9 GHz when the height of the cavity is fixed. However,...
Based on the requirement of phased-array antenna, a novel C broadband phased-array antenna element is designed and implemented. A new structure is applied: 4 cell antennas are combined through two-stage passive combiner, between which a band pass filter is added to restrain the out-of-band signals. Simulation and test data shows that the SWR is less than 1.5 within 22% of the band width, gain of the...
The paper has proposed a low-profile broadband UHF base station antenna based on lumped-element matching network with the combination of a height compressed conical antenna and a matching network. The proposed antenna is applied in base station communication systems with the frequency range from 300MHz to 870MHz. Compared with the traditional UHF base station antenna, the proposed antenna has a lower...
This paper studies a simple and novel annular-ring slotted microstrip patch antenna loaded by a surface mount chip capacitor for circularly polarized (CP) radiation. By connecting the capacitor with a proper value across the annular-ring slot at an appropriate position, the fundamental resonant mode of the microstrip patch antenna can be degenerated into two orthogonal modes with equal amplitude and...
This paper presents a wideband antenna consisting of two series-fed fan-shaped bowtie dipole antenna elements and an integrated tapered balun for through-the-wall imaging radar (TWIR) applications. The two fan-shaped bowtie dipole antenna elements with different radii and same flare angle are connected using a coplanar stripline and backed by a ground reflector. The balun realized by a tapered microstrip...
A novel reader antenna based on electromagnetic coupling between three meander open-ended microstrip lines for ultra-high-frequency (UHF) radio frequency identification (RFID) near-field applications is proposed in this paper. Meander line units are introduced to generate a strong uniform magnetic-field distribution over a large interrogation with no null zones. The antenna can be adapted to appropriate...
In this paper, a wideband segmented line dipole antenna with stable radiation patterns in E-plane was proposed and simulated. The configuration of the segmented line helps to reduc the phase lag of the following current which flows toward the same direction consequently. According to the simulated results, the designed antenna covers a wide impedance bandwidth of about 1.34 GHz (2.16–3.5 GHz, 47%)...
A low profile quadrifilar helix antenna based on top-loaded technology for global navigation satellite system is presented in this paper. The top-loaded technology can both be used to reduce the profile of the wire form quadrifilar helix antenna and the printed form. An S-band top-loaded quadrifilar helix antenna has been simulated and possesses the characteristic of wide beam width, high gain at...
A novel compact slotted dielectric substrate loaded broadband Vivaldi antenna is proposed. This antenna consists of a typical antipodal SIW Vivaldi antenna and two pieces of FR4 substrate with uneven thickness and periodic slots, two pieces of FR4 substrate is symmetrically loaded on Vivaldi antenna above and under respectively. The effects of different thickness distribution and slots on substrate...
The generation mechanism of harmonic and spurious emission in the phased array radar transmitting channels are analyzed. The channels components' influence on the phase of the harmonic and spurious emission are presented. The phase of harmonic and spurious emission at the stimulating ports of antenna elements are presented as well. The beam direction of harmonic and spurious emission in line array...
This study presents a newly modified unidirectional bowtie antenna with dual-band operation. The proposed antenna consists of two bowtie dipole elements, a square loop, a parallel-strip line (changed from a microstrip line), and a ground plane. The dual-wideband operating characteristics of this antenna are achieved by means of the square loop. Experimental results show that the proposed antenna has...
A novel split ring slot antenna with multiband characteristics is proposed in this paper. The antenna consists of a split ring slot and a ring slot on top surface as the radiator. A novel split ring slot antenna is proposed to realize polarized radiation based on the SIW cavity. Three patch-like radiation patterns and one monopolar radiation pattern at four different frequencies are excited by the...
A dual-band combined Mic-Dip antenna (Microstrip antenna and Dipole antenna) is proposed in this paper. The combined antenna, including the microstip antenna and the dipole antenna, is working for lower and upper band, respectively. To widen impedance bandwidth for the two operation bands, the coupling feed is employed for Mic-Dip antenna, which can achieve operating bandwidth of about 9.14 % ranging...
This paper describes the design of a low profile and wideband antenna array with circular polarization. The antenna consists of 2 × 2 elements. Loop coupled structure and sequential rotation feeding technique are used to obtained wideband VSWR and axial ratio performances. The proposed antenna array is analyzed with HFSS software. The VSWR, Axial Ratio, and Radiation Patterns of the array are presented...
A miniature and wideband helix antenna with gradient radius is proposed in this paper. The contour of the antenna is as a cone with small bottom and large top radius. An extra microstrip line is connected to the bottom end of the helix for impedance matching. The antenna is modeled and simulated. The simulated results show that the antenna can cover the bandwidth of 40% in X-band. It's expected this...
Two antennas with bidirectional same-sense circularly polarization are presented in this paper. The first antenna consists two back-to-back patches with a common ground and a stepped microstrip feeding line. The two patches are behaving as a cavity by coupling through a slot on the common ground, providing bidirectional patterns with the same-sense circular polarization. Based on the dual-patch cavity...
In this paper, we have presented two designs of dual-polarized antennas with omnidirectional radiation patterns in the azimuthal plane. For the first design, the vertical polarization is provided by a monopole with a co-planar waveguide feed; and the horizontal polarization is provided by a slot-coupled folded dipole structure. In order to reduce the antenna dimensions, the second design uses another...
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