A novel hybrid loaded vivaldi antenna with broadened relative bandwidth

Abstract

A novel Vivaldi antenna hybrid loaded with patches, resistors, and the split‐ring resonator (SRR) structure has been presented in this letter, since the resistors and the SRR structure are deemed to be capable of extending the low‐end bandwidth limitation and improving the impedance characteristics at the lower frequency. As contrast, the hybrid loaded and resistor loaded Vivaldi antennas design are numerically and experimentally demonstrated, showing the benefits of the adopted structure in extending the relative bandwidth to 168.22% and 160.77%, reducing the low‐end operating frequency of 69.8% and 57.8%, respectively. Compared with traditional Vivaldi antennas, the hybrid loaded Vivaldi antenna indicates the feasibility of extending the relative working bandwidth and reducing the low‐end working frequency while maintaining preferable miniaturization characteristics. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2037–2041, 2016

Non‐reflecting tapered slotline antenna with linear phase responses of both reflection and transmission for short‐pulse applications

“…Table 1 compares the proposed NRTSA and other UWB antennas. The proposed NRTSA has wider impedance bandwidth and linear phase responses of both reflection and transmission compared with References 3–6,19,21–23,30–32, and a high level of pulse waveform fidelity compared with References 5,23,32. In terms of the end‐fire realized gain and radiation efficiency, the proposed NRTSA characterizes a low radiation efficiency comparatively but a high realized gain compared with References 30,31.…”

“…Tapered slotline antenna (TSA) is prospective for the ultrawideband (UWB) short-pulse applications for its moderate realized gain, stable end-fire radiation pattern, and traveling wave characteristic. [1][2][3][4][5][6][7][8] Increasing requirements for UWB short-pulse antennas are put forward, including low late-time ring level, 2 short pulse duration, 5 and small waveform distortion. 7 Therefore, both impedance matching and shortpulse radiation performance of the TSA should be further investigated to meet these demands.…”

“…16 The subsequent researches improve upon the impedance bandwidth and radiation efficiency based on the Wu-King profile. 17,18 Aiming at reducing the port reflection of the TSA, the resistive loading technique 3,4,6 and absorptive material loading method are introduced. 19 The authors have been advanced in reducing the port reflection of the UWB antennas for short-pulse applications with resistive loading technique.…”

Wideband miniaturized antipodal Vivaldi antenna

“…[9][10][11][12][13][14] But this method will work badly, once the antenna which needs a compact size operates at a very low frequency. In work by Chen and colleagues, [15][16][17][18] resistive loading was adopted to absorb part of the energy when the electric current passes through and reflects back, by symmetrically welding chip resistors at the slots that are etched in the radiation arms, so this method can significantly improve the impedance matching performance at low frequency and greatly reduce the size of the antenna as well. However, determining the number, position, and value of the resistors is a challenging job, too many resistors would cause a gain decrease on the whole frequency band, and inappropriate position and value of the resistors may result in impedance mismatching.…”

Efficient RF energy harvest with a novel broadband Vivaldi rectenna

“…Vivaldi antenna with an exponential tapered geometry is widely used in many applications due to its characteristic of ultra-wideband performance. [10][11][12] Besides, the configuration of rectifier also has different types, such as single-diode rectifier, 13 voltage doubler rectifier 14 and fullwave Greinacher rectifier. 15 To realize the impedance matching between antenna and rectifying circuit, a matching network is of great importance which can also improve the RF to DC conversion efficiency at low-input power levels.…”