Tunable Frequency Selective Surface Based on a Sliding 3D-Printed Inserted Dielectric

Abstract

A novel mechanically tunable frequency selective surface (FSS) based on a sliding 3Dprinted inserted dielectric is presented in this paper. This paper first introduces the working mechanism of the tunable FSS, which indicates that the variable capacitance is the key to tunability. Based on this, we design an all-metal bandpass FSS with a certain thickness and a matching cross-shaped inserted dielectric. By changing the insertion depth of the dielectric, the resonance frequency can be adjusted. To optimize the performance, an improved structure based on a hollow support and a tripole slot is proposed. A tunable range from 3.24 to 5.52 GHz (53%) and good angular stability is obtained in the simulation. To verify this idea, we fabricate a cross slot prototype by 3D printing and mechanical engraving. Measured results show that this prototype has a continuous tunable range of 3.61 to 5.89 GHz (34.4%). INDEX TERMS Frequency selective surface (FSS), tunable, 3D printing, dielectric.

Design and Characterization of the Fully Metallic Gap Waveguide-Based Frequency Selective Radome for Millimeter Wave Fixed Beam Array Antenna

“…Therefore, despite the advances in 3D printing technology, which could for fixed beam array antenna (AA) designed in [20] with and without the dual GW-cavity FSS radome. resolve the manufacturing challenge, this form of 3D FSS is still mainly employed for low frequency applications [9]. Utilizing the SIW technology to design the FSS with superior filtering performance for high frequency is a better alternative.…”

“…One of the most used techniques is to increase the order of the FSS filter by realising the FSS with multilayer structures [3], [7]. Recently, it has also been suggested that the FSS can be designed in 3D to improve its filtering capability [8], [9]. These FSS structures do promise superior performance in terms of, e.g., high-order filtering response and larger bandwidth, particularly at the low frequency bands like the X-band.…”

“…Furthermore, the utilisation of 3D FSS structures poses a considerable challenge in manufacturing since the dimension of the FSS structures are considerably reduced at the mmWave bands. As a result, most if not all of these works [8], [9], have mainly found applications in the X-band or below.…”

Independently Tunable Closely Spaced Triband Frequency Selective Surface Unit Cell Using the Third Resonant Mode of Split Ring Slots

“…communication systems or radar applications. Therefore, AFSSs are an attractive solution to enhance flexibility, security, and efficiency of the upcoming generations of wireless communication systems [3][4][5][6][7].Recently, multiband FSSs have been developed by virtue of their versatility in multifrequency/multistandard system implementations [8][9][10][11][12][13]. Often, multiband communication systems use channels or services that are closely spaced in frequency.…”

“…communication systems or radar applications. Therefore, AFSSs are an attractive solution to enhance flexibility, security, and efficiency of the upcoming generations of wireless communication systems [3][4][5][6][7].…”