Showing papers on "Front-to-back ratio published in 2006"
TL;DR: In this article, a technique for reducing the dimensions of the cavity of a cavity-backed slot antenna (CBSA) is presented, which facilitates proper fabrication and integration of miniaturized slot antennas on multilayer substrates.
Abstract: A technique for reducing the dimensions of the cavity of a cavity-backed slot antenna (CBSA) is presented, which facilitates proper fabrication and integration of miniaturized slot antennas on multilayer substrates. This is accomplished by replacing the solid metal around the traditional slot antennas with a specific metallic pattern that can be viewed as a series of parallel strip lines placed around the slot antenna. This metallic pattern is then modified by designing the parallel strips in a compact fashion to reduce the overall antenna dimensions and obtain a reduced-size CBSA. It is shown that, for a simple straight slot antenna, the overall occupied volume of the modified cavity backing the slot antenna can be reduced by more than 65% without affecting the high radiation efficiency of the antenna. A number of traditional cavity backed slot antennas and the proposed modified CBSAs are designed, fabricated, and measured. The reduced-size CBSAs show a very low input VSWR, low cross-polarized radiation levels, and high radiation efficiency. Despite their small ground plane size, the proposed cavity backed slot antennas have front-to-back ratio (FTBR) values in the range of 6-7 dB
92 citations
Patent•
22 Feb 2006
TL;DR: In this paper, the utility model of a base station antenna with a high front-to-back ratio was shown to achieve irradiating performance with a front and back ratio of over 35dB under the condition that the size of the reflecting plate is unchanged.
Abstract: The utility model relates to a base station antenna, particularly a directional base station antenna with a high front to back ratio and used for cellular mobile communication systems The utility model comprises a metallic reflecting plate and a plurality of radiating unit modules, wherein the radiating unit modules are installed on the same side of the metallic reflecting plate, and are discretely arranged on the same straight line of the metallic reflecting plate; in addition, both sides of the metallic reflecting plate which are parallel to the direction in which the radiating unit modules are provided with folded edges Therefore, under the condition that the size of the metallic reflecting plate is basically unchanged, the utility model realizes irradiating performance with a high front to back ratio, which causes the front and back ratio of the base station antenna to reach over 35dB, and simultaneously, a newly reformed structure of the utility model is very simple and can be installed and repaired conveniently Compared with other reforming methods, the utility model can reduce the cost
2 citations
01 Jan 2006
TL;DR: In this paper, the EBG(electromagnetic band-gap) high-impedance surface structure is utilized as a high-IMpedance ground plane for slots on rectangular waveguide to raise the front to back(F/B) ratio.
Abstract: This paper deals with the method to raise the front to back(F/B) ratio on the pattern for the slots antenna of rectangular waveguideThe EBG(electromagnetic band-gap) high-impedance surface structure is utilized as a high-impedance ground plane for slots on rectangular waveguide to raise the front to back(F/B) ratio,and detailed analysis is made to study the influence of EBG high-impedance surface characteristic on the radiation properties of the slots array antenna of rectangular waveguide by using the simulation methodThe electric parameters of the designed example antenna are measuredThe experimental results show that this method is effective
1 citations
01 Jan 2006
TL;DR: In this paper, the authors show how the design of integrated arrays can significantly benefit from Planar Circularly Symmetric (PCS) Electromagnetic Band Gap (EBG) structures.
Abstract: This paper shows how the design of integrated arrays can significantly benefit from Planar Circularly Symmetric (PCS) Electromagnetic Band Gap (EBG) structures. Using this technology, a phased array that scans up to 40o in one dimension and that is characterized by relatively large bandwidth (BW ≈ 15%) is designed, manufactured and tested. The specific advantages coming from the use of PCS-EBGs are two fold. On one hand the losses associated to surface waves are significantly reduced. On the other hand each element of the array has a larger effective area that leads to a higher gain for the complete array when compared with a standard technology. Additional benefits are the low cross-polarization levels, the good front to back ratio, considering that the antenna does not include a backing reflector, and the low profile.