Front-to-back ratio

About: Front-to-back ratio is a research topic. Over the lifetime, 292 publications have been published within this topic receiving 3314 citations.

Wideband Microstrip Yagi-Uda Array Antenna with High Gain and F/B Ratio for 5 GHz Wi-Fi Band Applications

Abstract: A wideband inset feed microstrip Yagi-Uda array antenna on photonic crystal substrate with high gain and front to back (F/B) ratio for 5 GHz Wi-Fi band has been proposed. At first, a microstrip Yagi-Uda array antenna has been designed on Rogers RT/Duroid 5880 (lossy) having dielectric constant of 2.2 and tangent loss of 0.0009. Later on, few numbers of cylindrical air gaps has been introduced in the substrate and the length and width of patch somewhat has been readjusted without changing overall size of the antenna. In that case the performance of the antenna is enhanced in terms of IEEE gain (9.816 dB), directivity (10.15 dBi), bandwidth (396.2 MHz), efficiency (96.71%) and F/B ratio (29.094 dB) though return loss somewhat decreases. So the proposed antenna possesses very high front to back ratio as well as high gain and wide bandwidth. A vivid comparison between the microstrip Yagi-Uda array antennas without air gaps and with air gaps have also been presented in this paper.

Unidirectional Magneto-Electric Dipole Antenna for Base Station: A Review

Abstract: Unidirectional base station antenna design using Magneto-Electric Dipole (MED) has created enormous interest among the researchers due to its excellent radiation characteristics like low back radiation, symmetrical radiation at E-plane and H-plane compared to conventional patch antenna. Generally, dual polarized antennas are used to increase channel capacity and reliability of the communication systems. In order to serve the evolving mobile communication standards like long term evolution LTE and beyond, unidirectional dual polarized MED antenna are required to have broad impedance bandwidth, broad half power beamwidth, high port isolation, low cross polarization level, high front to back ratio and high gain. In this paper, the critical electrical requirements of the base station antenna and frequently used frequency bands for modern mobile communication have been presented. It is followed by brief review on broadband patch antenna and discussion on complementary antenna concepts. Finally, the performance of linearly polarized and dual polarized magneto-electric dipole antennas along with their feeding techniques are discussed and summarized. Also, design and modeling of developed MED antenna is presented.

Double side intermediate frequency flat panel antenna

Abstract: The utility model relates to an antenna, and especially relates to an intermediate frequency flat plate antenna with the band of 1710MHZ to 2500MHZ The existing intermediate frequency flat plate antenna cannot meet the existing demand due to low national standard of front to back ratio The double side intermediate frequency flat plate antenna provided by the utility model comprises an antenna base plate (1) and sides (2) The sides (2) are located on both sides of the antenna base plate (1), and are fixedly connected with the antenna base plate (1) The double side intermediate frequency flat plate antenna is characterized in that two sides (2) are arranged on each side of the antenna base plate (1); the heights of two sides (2) are different; the heights of two sides (2) on each side of the antenna base plate (1) are different; and the height of the outer side (3) is higher than the height of the inner side (4) According to the intermediate frequency flat plate antenna structure provided by the utility model, the front to back ratio exceeds the national standard; the structure is simple; simple improvement is carried out based on the existing structure; and the effect is obvious

3D-printed High-Directivity H-plane Horn Antenna with High Front-to-back Ratio Using Soft and Hard Walls

Abstract: We employ hard and soft walls to improve antenna directivity and front-to-back ratio of an H-plane horn antenna. Design of this class of antenna has been limited by fabrication methods. While machining methods limit fabrication of 3D designs with complex interior shapes, SIW technology restricts the design to planar structures, foregoing benefits of 3D designs and forcing use of dielectric materials that are lossy. With the advent of 3D-printing technology for antenna and microwave devices, however, 3D hard and soft walls can be integrated in an H-plane horn antenna, improving its performance, which is not possible with conventional fabrication methods. Here, an H-plane horn antenna is designed and 3D-printed at X-band. Using hard and soft walls, directivity and front-to-back ratio are improved by 2.25 dB, and 13.7 dB, respectively, compared to an standard H-plane horn antenna, while the bandwidth covers X-band with lower return loss. The measurement results of the 3D-printed and conductive coated antenna are in good agreement with simulations.

Novel singly-fed rectangular microstrip patch elements for circular polarisation

Abstract: This paper presents two novel types of singly-fed circularly polarised microstrip radiating elements that use multilayer substrates. The antenna elements are designed to operate in S-band with a centre frequency of 2.45 GHz. The measured impedance bandwidths (VSWR/spl les/2) are 23% and 14% while the computed 3-dB axial-ratio bandwidths are 7% and 2% respectively. Important radiation characteristics such as gain bandwidth, cross polarisation and front-to-back ratio of these elements have also been examined and compared.