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In this paper, a full solid angle scanning cylindrical-and-conical (CYLCON) conformal phased array antenna (PAA) is designed. First, a microstrip Yagi antenna with low profile and small size is proposed and discussed. Second, a cylindrical conformal Yagi antenna array consisting of 24 aforementioned 8-element Yagi antennas is designed and optimized. Simulation results show that the Yagi antenna array...
A novel half Maxwell fish-eye (HMFE) lens is presented, which can be employed to broaden the beamwidth. The novel HMFE lens is a deformation of traditional one. To verify the proposed principle, a common circularly polarized microstrip antenna with a 100mm-diameter ground working at 7.8GHz is chosen as a radiating source. The radiation patterns of the antenna with and without the novel HMFE lens have...
In this paper, the design of focused sparse array has been discussed. Sparse array technique has been used to depress the sidelobe level (SLL) in the focal plane when the averaged distance between adjacent antennas is beyond one wavelength. Numerical result reveals that sparse array technique can depress SLL in focal plane effectively without extending the focal spot size. Finally, a focused array...
A cylindrical conformai microstrip Yagi antenna working around 10 GHz with endfire radiation and vertical polarization is proposed. The presented Yagi antenna has advantages of low profile, small size and high endfire gain. Each element of the Yagi antenna is a microstrip antenna (MSA) with one edge shorted, which can be regarded as a half MSA (HMSA). Furthermore, a cylindrical conformal Yagi array...
A full-solid-angle (FSA) scanning planar phased array is proposed in this paper. The identical array element is consisting of two identical back-to-back microstrip antennas, which can be controlled independently by a power control unit. To verify the proposed principle, a 4 × 4 elements planar array is designed and simulated. The simulated results demonstrate that the main beam of the array can cover...
To broaden the beamwidth of microstrip antenna (MSA), a method of loading parasitic dipoles is proposed. Its equivalent analysis model has been proposed based on the cavity model. Numerical results reveal that the dipole can act as director or reflector according to its length and the distance between the patch and dipole. Then, the effect of parameters of a pair of parasitic dipoles on beamwidth...
The design of a circularly polarized (CP) microstrip antenna with wide beamwidth working at 1.268GHz is proposed. The wide beamwidth is achieved by introducing a substrate larger than the ground and an annular dielectric superstrate with a metal ring. The effects of the substrate, superstrate and ring on radiation pattern and circular polarization are discussed. Simulation results show the proposed...
In this paper, the optically transparent microstrip antenna made of transparent ITO (Indium Tin Oxide) films is investigated. The present transparent microstrip antenna comprises a thin sheet of quartz glass substrate with two conductive ITO film coatings and is fed through a coaxial probe. As an example, an X-band transparent microstrip antenna is designed, fabricated and measured. To discuss the...
Firstly, a novel slow-wave microstrip structure (SWMS) is proposed, which is composed of two-layer metamaterial. Then, a high gain compact resonant antenna based on the present SWMS is designed, fabricated, simulated and measured. The length, width and height of the proposed antenna are only 1/9 λ0, 1/9 λ0, and 1/36 λ0, respectively. The patch area of proposed antenna is only 14.6% of a conventional...
A wide beamwidth circularly polarized microstrip antenna is presented, which is composed of multi-layers and fed through a single coax probe. Proper perturbation is introduced by two truncated corner on the patch to generate a circularly polarized wave. Meanwhile, plated-through pins to the ground, connected by the square ring, are used to realize the wide beamwidth radiation. Finally, an antenna...
In this paper, the transmission and radiation properties of carbon nanotube (CNT) array are investigated experimentally. It has been found that the transmission of the waveguide is improved by installing the CNT array in the rectangular waveguide, indicating the CNT arrays can transport microwave energy efficiently. By comparing the radiations of microstrip Yagi-Uda antenna and microstrip patch with...
Firstly, the paper designs a novel broad beamwidth microstrip antenna at 16GHz, whose 3dB beamwidth is up to 170 degrees. Then a conformal phased array on conical surface is designed by means of the present broad beamwidth microstrip antenna. To achieve effective beam scanning in whole elevation and rolling planes, the whole rolling plane has been divided into six sections. Numerical results show...
Based on the sharp relationship between Ang(S21) of CRLH-TLs and working frequency, CRLH-TLs TDLs with large time delays are proposed. Meanwhile, sawtooth-shaped PMLs are selected to realize tiny time delays. Finally, a 9-bit time delay module consisting of CRLH-TLs, sawtooth-shaped PMLs and OMLs as well as eighteen SPDTs is designed and fabricated. By selecting different states of SPDTs, time delays...
Based on the theoretical analysis of microstrip antenna (MSA) loaded with a shorting-pin, a novel MSA with broad beamwidth is proposed. In the structure, multiple layers are used to achieve high radiation efficiency, while a conducting cylinder and a coupling aperture are applied to excite multiple modes to obtain broad beamwidth. Finally, a novel MSA is designed and fabricated as an example. The...
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