Abstract
Fresnel zone plate (FZP) lens antenna, consisting of a set of alternative transparent and opaque concentric rings arranged on curvilinear or flat surfaces, have been widely used in various fields for sensing and communications. Nevertheless, the state-of-art FZP lens antennas are limited to a single band due to the frequency-dependent feature, which hinders their use in multi-band applications. In this work, a shared aperture dual-band FZP metalens antenna is proposed by merging two single-band FZP metalens antenna operating at distinct frequency bands seamlessly into one. Instead of using conventional metallic conductors, double-screen metagrids are devised in this work to form the concentric rings. Because the metagrids show distinct transmission/reflection properties at different frequencies, the performance of one set of concentric rings operating at the one band will not be affected by the other operating at the different band. In addition, to compensate for the phase shift introduced by the metagrids, an additional dielectric ring layer is added atop the FZP taking advantage of additive manufacturing. Thus, the radiation performance of the dual-band FZP lens antenna is comparable to that of each single FZP metalens antenna. For proof-of-concept, an antenna prototype operating at the dual band, 75 and 120 GHz with a frequency ratio of 1.6, is fabricated using an integrated additively manufactured electronics (AME) technique. The measured peak gains of 20.3 and 21.9 dBi are achieved at 75 and 120 GHz, respectively.
Highlights
M ILLIMETER-WAVE and terahertz (THz) technologies create a new era of many emerging research areas, such as high-resolution imaging, high-speed big data communications, and ubiquitous sensing [1]–[6]
The prototype of the proposed Fresnel zone plate (FZP) metalens antenna is shown in Fig. 8, which has a circular aperture with a radius of 32.5 mm
The results demonstrate that the proposed dual-band FZP metalens solution is still effective when the ratio of the portions of regions I, II, III, and IV changes
Summary
M ILLIMETER-WAVE (mm-wave) and terahertz (THz) technologies create a new era of many emerging research areas, such as high-resolution imaging, high-speed big data communications, and ubiquitous sensing [1]–[6]. Many state-of-art mm-wave metalenses and transmitarrays are limited to a single band [15]–[22]. State-of-the-art works using additive manufacturing are either dielectric printing (coated with metal if required) or directly metal printing. Lenses or transmitarrays using conductive and dielectric integrated additively manufactured electronics (AME) technique have not been reported. A reconfigurable FZP lens antenna at the microwave region was proposed by using pin diodes to control different states of metasurface to realize dual-band operation [45], but still. A shared aperture dual-band singlepolarization FZP metalens antenna is proposed. Concentric opaque rings of FZP metalens antennas operating at low-band and high-band are formed using double-screen metagrids, which show distinct transmission/reflection properties at. For proof-of-concept, a dual-band FZP metalens antenna operating at 75 and 120 GHz is fabricated using an integrated AME technique. It is noted that the design is only chosen as a demonstrative example, and it has the potential to be configured to other frequencies with different frequency ratios
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