Impedance matching for omnidirectional and polarization insensitive broadband absorber based on carbonyl iron powders

Effect of Surface Structure and Composition on the Electromagnetic Properties of Ti3C2Tx MXenes for Highly Efficient Electromagnetic Wave Absorption

“…With the fast development of electronic equipment and wireless communication, electromagnetic pollution is becoming increasingly serious, which may not only influence device performance but also do harm to the surrounding environment. − To eliminate the ensuing problems caused by electromagnetic interference, one way is to develop highly effective shielding strategy. − On the other hand, high performance electromagnetic wave absortion materials have been developed to improve this problem by eliminating adverse electromagnetic waves. − Under the premise of impedance match, the microwave absorbing materials can transform electromagnetic energy into thermal energy through magnetic loss and electrical loss . In addition, there has been an urgent demand for lightweight, low-thickness, strong-absorption, and broad-band electromagnetic wave absorbers in practical application …”

“…15 In addition, there has been an urgent demand for lightweight, low-thickness, strongabsorption, and broad-band electromagnetic wave absorbers in practical application. 16 Recently, great efforts have been devoted to research on two-dimensional (2D) materials for electromagnetic shielding and microwave absorption, such as graphene, 17 molybdenum disulfide, 18 and titanium carbide (MXene), 19 because they are lightweight, have large surface area, enable multifunctional processing, and have unique physicochemical properties. 20 For graphene-based absorbing materials, there are two effective strategies to improve the microwave absorption performance.…”

A Multiple-Bands Metamaterial Absorber Based in X, Ku and K-Band

“…From that point forward, various kinds of Single-Band [11][12][13][14][15] and Multiple-Band [16][17][18][19][20] MA contemplates were designed. Moreover, polarization-independent [21][22][23][24][25] and Tunable Perfect Metamaterial Absorbers (PMA) [26][27][28][29][30] were structured in the Gigahertz, Megahertz, and also in Terahertz. Mehmat et al [31] have proposed an Absorber which consists of a split ring resonator (SRR) and it has the perfect absorption between 4 and 16 GHz.…”

Gain‐improved VHF broadband whip antenna loaded with radiation blades

“…However, in the trend of miniaturisation of antennas, whip antennas with limited height often belong to electrically small antennas in short wave band, whose input impedance is very sensitive to frequency, especially in low‐frequency band, the input resistance is small and the input reactance is large, which is difficult to match the impedance of feeder, and results in a narrow working band of antennas. In order to improve the bandwidth of whip antenna, scholars have proposed such methods as top load [2], RLC network load [3–5], matching network [3, 6–10] and fractal antenna [11, 12]. At present, loading and matching network technology are widely used, but the introduction of resistance brings new losses to the antenna and reduces the efficiency of the antenna.…”