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.

Dual-Band Coplanar-Waveguide-Fed Slot-Coupled Rectangular Dielectric Resonator Antenna

Abstract: Dual band antennas are important in communication systems which operate in more than one frequency band. This paper presents a new dual band coplanar waveguide- fed- slot coupled rectangular dielectric resonator antenna operating at the two frequency bands centered at 5.4 and 6.8 GHz. The use of DR allows for unidirectional radiation with a front to back ratio of more than 10 dB. The designed antenna is linearly polarized with a cross polarization level more than 26 dB lower than the co-polarization level.

A novel high gain K-band H-plane SIW horn antenna using dielectric loading

Abstract: A K-band dielectric loading substrate integrated waveguide(SIW) H-plane horn antenna has been proposed in this paper. The Substrate integrated waveguide technology allows to construct some types of antennas in a planar way. However, when the substrate thickness is much thinner than the wavelength, the poor matching, undesired back radiation and low gain of SIW horn antenna appear. The new structure entirely overcomes these limitations. It consists of a printed transition which improves the matching performance and front-to-back ratio (FTBR). The dielectric loading which is integrated with the horn in the same single substrate improves the gain of antenna. The measurement results show that the antenna obtains high gain (7dBi), good matching (19.6 GHz–22.9GHz) and good FTBR(21dB).

Effect of Partial Ground Plane Removal on the Radiation Characteristics of a Microstrip Antenna

Abstract: This study presents a new, simple method for reducing the back-lobe radiation of a microstrip antenna (MSA) by a partially removed ground plane of the antenna. The effect of the partial ground plane removal in different configurations on the radiation characteristics of a MSA are investigated numerically. The partial ground plane removal reduces the backlobe radiation of the MSA by suppressing the surface wave diffraction from the edges of the antenna ground plane. For further improving the front-to-back (F/B) ratio of the MSA, a new soft-surface configuration consisting of an array of stand-up split ring resonators (SRRs) are placed on a bare dielectric substrate near the two ground plane edges. Compared to the F/B ratio of a conventional MSA with a full ground plane of the same size, an improved F/B ratio of 9.7 dB has been achieved experimentally for our proposed MSA.

Printed backfire wideband circularly polarised tapered gap loop antenna

Abstract: A new type of broadband printed loop antenna is presented. The antenna produces backfire linearly polarised signals over a wide band of frequencies 1.2 to 2.2 GHz, with <3 VSWR. The front-to-back ratio of the antenna is 22 dB; its on-axis cross-polarisation level is around −25 dB at 1.5 GHz and is better than –16 dB over the entire frequency band. Backfire radiation is achieved by using a novel wide printed rectangular loop radiating element with integral tapered gaps. These gaps provide the phasing necessary for the radiating elements of the antenna to enable backfire radiation in the plane of the loop. Two such printed tapered gap loops are arranged in an orthogonal configuration to produce broadband circularly polarised radiation. Here for a VSWR ≤3 the bandwidth is more than an octave (1.1 to 2.4 GHz) with an axial ratio of <4 dB. Simulated and measured results are presented for both configurations.

Novel compact circularly polarized antenna with high front-to-back ratio for UHF RFID reader applications

Abstract: A novel compact single feed circularly polarized disk patch antenna with high front-to-back ratio for radio frequency identification (RFID) reader in the ultra high frequency (UHF) is proposed. A perturbation is induced by two cuts for the circular polarization. Four silts on the disk are used to miniaturize the size of the antenna. Furthermore, the backward radiation is reduced by the slits and the ground with proper size. The simulated and the measured results show that good performance of the proposed design is obtained, and the proposed antenna can be used in the special situation where each of the two back to back antennas is in charge of their own positive semi sphere.