Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 68, Issue 12, Pages 7969-7977Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2020.3000831
Keywords
Absorption; Impedance; Equivalent circuits; Integrated circuit modeling; Resistance; Frequency selective surfaces; Broadband antennas; Absorption band; absorptive transmission; reflection surface (ATRS); band-absorptive frequency-selective rasorber (FSR); dual-polarized; equivalent circuit model; lowpass band
Funding
- National Natural Science Foundation of China [61722107, 61701152]
- Open Fund of the State Key Lab of Millimeter Waves of China [K201914]
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A dual-polarized broad band-absorptive frequencyselective rasorber (FSR) is proposed in this article. The FSR has a lowpass band with low insertion loss and a broad absorption band. It is a two-layer structure formed by a lossy surface cascaded an absorptive transmission/reflection surface (ATRS), in which the ATRS is constructed by one substrate with a resistive square loop on its top side and a double square loop on its bottom side. The working mechanisms of the proposed ATRS and FSR are completely studied by using their equivalent circuit models. The ATRS retains dual stopbands of the double square loop and suppresses the unwanted transmission pole of the double square loop. Then a broadband absorptive FSR is achieved. A sample of the proposed FSR is fabricated and measured. The measured results show that the proposed FSR has a lowpass band up to 860 MHz (vertical bar S-21 vertical bar >= -1 dB) and a broad absorption band with bandwidth of 95.3% from 3.84 to 10.83 GHz (vertical bar S-11 vertical bar <= -10 dB and vertical bar S-21 vertical bar <= -10 dB).
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