Abstract
This paper proposes a broadband metamaterial aperture antenna (BMAA) with a large capacity, low correlation coefficients and high radiation efficiency for coincidence imaging in the terahertz band. The BMAA consists of a random modulated metamaterial aperture and a stripline structure as the feed system. Firstly, a metamaterial element complementary electric-inductor-capacitor (cELC) is designed and a metamaterial aperture is formed via randomly-distributed metamaterial elements with different resonant frequencies. By leveraging the amplitude and the phase modulation characteristics of the metamaterial elements, the BMAA can generate radiation patterns with low correlation coefficients in the range 240-340 GHz. In order to improve the feed efficiency, a stripline structural unit (SSU) is designed and analyzed using an even-odd mode analytical method, and a broadband feed system is designed by cascading SSUs. The performance of the BMAA, including the reflection coefficient, the radiation efficiency and the correlation coefficients of the radiation patterns at different frequencies are then evaluated. The BMAA can solve problems that exist for coincidence imaging, including a narrow working band, lack of measurement modes and low radiation efficiency and offers better results. Finally, a coincidence imaging experiment is implemented using the proposed BMAA and the original image is reconstructed successfully. All results are validated through simulations.
Highlights
With the rapid development of radio technology in recent years, bandwidth availability in the electronic-magnetic spectrum has become more and more scarce
DESIGN OF METAMATERIAL ELEMENT AND APERTURE In a metamaterial aperture, a broadband guided electromagnetic wave transmitted by the stripline structure will be coupled by complementary electric-inductor-capacitor (cELC) resonating at different frequencies [30]–[33], where each cELC can be regarded as an element of the antenna array with a specific amplitude and phase modulation characteristic
In this paper, a broadband metamaterial aperture antenna (BMAA) design was proposed which has a large capacity, low correlation coefficients and high radiation efficiency for coincidence imaging in the terahertz band
Summary
With the rapid development of radio technology in recent years, bandwidth availability in the electronic-magnetic spectrum has become more and more scarce. Zhu proposed a wideband frequency-polarization-diverse reflection metamaterial aperture in the Ka band, which can be used to generate uncorrelated measurement modes from different polarization incident plane waves [28]. All these studies have contributed to a new design paradigm for designing the broadband metamaterial aperture antenna (BMAA) in coincidence imaging. Metamaterialbased coincidence imaging requires large numbers of uncorrelated measurement modes, which requires the metamaterial aperture antenna to have a wide bandwidth and low correlation coefficients between radiation patterns of different frequencies.
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