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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...
In this paper, a power divider is proposed. The presented divider consists four varactors and two microstrip lines. The divider has four ports, port 1, port 2, port 3 and port 4. Port 1 is the input port, and port 3, 4 are output ports. Besides, port 2 is the isolated port. When the capacitance of the four varactors is 0, the power is outputted in port 4. When the capacitance of the four varactors...
In this paper, a new millimeter-wave transmit/receive antenna module for radar sensors was proposed. This antenna was designed operating at 24 GHz and intended for obstacle detection and short-range automotive applications. The transmitting part was implemented by a microstrip array antenna with 48-elements and improved with the concern of nonhomogeneous weights for amplitudes excitation. The receiving...
In this letter, a novel folded monopole antenna with an ultrawideband (UWB) bandwidth and omnidirectional radiation performance has been proposed. An inverted “S”-type structure was formed by folding the planar monopole, which not only realizes dimension reduction, but also contributes to a decrease in the size of the ground plane; the proposed monopole antenna, meanwhile, has a more circular radiation...
The microstrip antenna is widely used in our life now for its low profile, simple structure, low cost and omnidirectional radiation patterns. But the drawbacks of this kind antenna also sometimes confine their applications, especially the narrow bandwidth. In this paper, a microstrip antenna with the defected ground structure (DGS) is proposed. The bandwidth of an original antenna without DGS is significantly...
This paper propose a new kind of circular polarization antenna, i.e. CPA , composed of fold crossed dipole. The fold dipoles are vertical in space, and there is 90 degree phase difference between their feeding current. With the software CST Microwave StudioR , we conclude that there is almost no difference between fold and non-fold crossed dipole about their properties, except their size, the size...
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