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![Basic geometry of back fire antenna [1].](publication/275068124/figure/fig1/AS:1088884335214593@1636621664750/Basic-geometry-of-back-fire-antenna-1_Q320.jpg)
Backfire antenna 0.265
λ
for bandwidth enhancement is proposed and investigated. The proposed antenna is fed by a 50 Ω coaxial feed. The bandwidth of proposed antenna for S and C band is investigated. The performance of backfire antenna is investigated by performing numerical calculation by using various mathematical formulas to determine necessary...
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Slots are incorporated in ground plane of a simple rectangular patch antenna designed in C-band on FR-4 substrate with dielectric constant εr = 4.3 and height, h = 1.5 mm. The presence of slots shows multi frequency characteristics with enhanced bandwidth and directivity as compared to simple patch antenna without modified ground plane. The S11 par...
Citations
... SBF designs have been reported in the low end of the microwave spectrum (e.g., S-band), midrange as Wi-Fi antennas, X-band antennas, and even up to millimeter-wave Manuscript designs [10]- [12]. The early designs were fundamentally narrowband, and therefore, research has been conducted to extend the bandwidth of operation [6], [13]. The designs scale with frequency and can be adapted to a variety of functions [14]. ...
... From this summary table, we note that small volume antennas can achieve high-impedance bandwidth, but at the cost of low peak gain (e.g., [6], [13]). Some of the designs with the highest gain had the lowest reported bandwidth (e.g., [16], [19], [20]). ...
We present two designs that improve the gain and cross-polarization performance of the waveguide-fed short backfire (SBF) antenna by introducing a choke (SBF-2) and by loading the cavity with a metallic ring feature (SBF-2-Ring). A series of parametric simulation studies on antenna dimensions provides information on how to improve the antenna gain and cross-polarization performance while simultaneously extending the impedance bandwidth. For SBF-2, the peak gain was 16.6 dBi, the minimum cross-polarization ratio was −23.8 dB, and the maximum impedance bandwidth was 27.3%, with a gain bandwidth of 19.2%. For SBF-2-Ring, the peak gain was 15.8 dBi, the minimum cross-polarization ratio was −29.1 dB, and the maximum impedance bandwidth was 43.5%, with a gain bandwidth of 31.8%. The concepts were verified by designing, fabricating, and testing two prototypes in the microwave C-band. Excellent agreement between simulation and measurement was achieved. The measured gain for SBF-2-Ring was >14 dBi for 4.7–6.2 GHz and the worst case cross polarization in the diagonal plane was
$< -22$
dB for 5.3–5.8 GHz. Cross-polarization in the principal planes has significantly greater bandwidth and the worst case analysis is presented to give limitations on the performance.
... Such structure design of an antenna bandwidth is 14.20% [2]- [3] similarly by changing, parasitic element or stacking the position and length of the slit or parasitic element investigator operated in different band [6]. The parasitic element used at a distance of a 0.5λ of an exciting patch the investigate to come close to a bandwidth of 52.8% [7] II. ANTENNA ANALYSIS ...
This article present a compact proposed patch antenna for impedance matched for simple two horizontal slot is placed in a active patch with a via hole in sandwiched between radiated patch and bottom plane of an microstrip patch antenna for a band of 4 to 12Ghz application. The planned antenna is synthesized by using glass reinforced epoxy laminated material (FR4) and electromagnetic 3D view (IE3D) software. The software based design is suitable for a band of 3.3//5.5 Wi-Max and 5.3/5.8 WLAN frequency band. It is also suitable for satellite application The ground and exciting patch is separated by 1.5mm thickness. The proposed antenna parameter is design for 10Ghz..For such design the achieved Bandwidth for an antenna is 53 % at a VSWR<2, acceptable return loss (S11) = - 22.5dB, and the directivity of an antenna is 6 dBi. The antenna is appropriate for an application of X band. The designs of an antenna and its result have been discussed in detail.
... The reflector antennas have been widely used in various wireless systems, they may be used for long-range point-to-point applications, say WLAN, WISP, and satellite links. Although the backfire antenna suffers from narrow bandwidth different methods have been proposed to widen the bandwidth of the back reflector [1,2,4]. A multiplate reflector structure was designed to widen the operation bandwidth of the unidirectional antenna. ...
... The antenna was designed with two reflectors, one rectangular and the other circular. The antenna bandwidth can be enhanced approximately 12 times (from 4.5 to 52.8 %) [4]. ...
... The low Fig. 1 Basic geometry of backfire antenna [1] value of dielectric constant increases the fringing field at the patch periphery and thus increases the radiated power. A small value of loss tangent is always preferable in order to reduce dielectric loss and surface-wave losses and which increases the efficiency of the antenna [4,5]. ...
A novel back-reflector antenna for bandwidth enhancement is presented. The proposed antenna is designed by using two reflectors: one is the main reflector with a U-shaped slot at four truncated shape corners and the second is a subreflector with square spiral shaped antenna. The proposed antenna is designed for 10 GHz and we achieved a bandwidth of 129 % for VSWR < 2, minimum return loss = −28.44 dB, and maximum directivity 7.061 dBi. The antenna, which is suitable for C, X, and Ku, is used.
This thesis presents research into microwave remote sensing technologies for Arctic Science applications. In the first part of my thesis, I created and verified procedures for measuring the dielectric of a small volume of oil with cavity resonator and dielectric probe techniques. I designed and fabricated a cavity resonator and utilized a dielectric probe to demonstrate the technique and to generate new measurement results for three types of oil products. The measurement results are needed in dielectric mixture modelling and simulations of the normalized radar cross-section (NRCS) of oil-contaminated sea ice. I utilized five existing dielectric mixture models and the measured dielectric constants of three types of oil to model both clean and oil-contaminated sea ice. I simulated and compared their NRCS (three different types of contamination with three different amounts). The simulation results showed that I could distinguish between the clean and oil-contaminated sea ice based on the NRCS magnitudes. The simulation results demonstrate that for higher incidence angles, distinguishing clean sea ice from oil-contaminated sea ice with VV polarization is easier than HH polarization. In the second part of my thesis, I designed C-band Short Back-fire antennas that can be used for remote sensing applications. I simulated and characterized six different designs of Short Back-Fire antennas. The first design, SBF-1, is an optimum case of the conventional SBF antenna. In SBF-2, I improved the realized gain and bandwidth of the first one by adding a cylindrical choke to the main reflector. In the third design, I filled the choke with Teflon. In the subsequent designs, I increased the bandwidth and realized gain of SBF-1 and SBF-2 by adding a ring beside the rim and by adding a choke to the rim. To validate the simulations, I fabricated and tested SBF-1 and SBF-2. The measurement results show good agreement between the simulations and the actual measurements.
