Abstract
In this work, an ultra-thin microwave absorber with a Jerusalem cross (JC) resonator exhibiting a broad low-frequency absorption bandwidth was successfully designed and fabricated. The system is composed of a perfect electric conductor-magnetic-periodic metal three-layer structure. The top metal layer consists of a periodic JC, which can be used to obtain dual-bands and low-frequencies in L-band, S-band, and C-band applications. The simulations show that the magnetic absorber with a thickness of 2 mm exhibits two absorption peaks at 1.4 and 4.7 GHz, with a reflectivity of −10 and −8 dB, respectively. The L-band RL (reflection loss) of −4 dB bandwidth has 91% (1–1.91 GHz), whereas the S-band and the C-band of −4 dB bandwidth have 47% (2.87–5.68 GHz). The total thickness of the absorber measures only 1/100λ at 1.5 GHz. When a magnetic harmonic TM is polarized at an incidence angle of 75°, an average RL of −10 dB in the 1–8 GHz range is obtained. The equivalent L–C circuit and the power loss density clarify the mechanism behind the absorption. Such a low-frequency absorber can be used in various applications to quench microwave energy.
Highlights
Microwave absorbers have triggered significant interest due to their widespread applications in the field of electromagnetic radiation control, in particular in electromagnetic interference, stealth technology, and electromagnetic compatibility
A metamaterial absorber based on a spherical-like carbonyl iron powders (CIPs) filled rubber plate was experimentally tested and simulated
The JCMA structure exhibits a broader absorption band at low frequencies for a constant thickness when compared to the SJCMA one
Summary
Microwave absorbers have triggered significant interest due to their widespread applications in the field of electromagnetic radiation control, in particular in electromagnetic interference, stealth technology, and electromagnetic compatibility. With the current development of modern stealth and detection technologies, microwave absorbers with high performance in broader and lower frequency bands are required in many applications. Traditional magnetic absorbing materials exhibit large thickness, large areal density, a fixed narrow absorption band, and singleband absorption. The working frequency band of warning radars lies in the UHF (30–300 MHz) and in the VHF (300 MHz–3 GHz) range. For this reason, the thickness of such L-band absorbers reaches the centimeter, which cannot be used in practical applications
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