Challenges of the naval electromagnetic environment for the EMC engineer

Raghu, K.

doi:10.1109/icemic.2003.237780

Cited by 6 publications

(2 citation statements)

References 2 publications

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“…Here we present a modular antenna topology, a capacitively coupled disk loaded monopole, that allows for quick and easy change of network configuration, without any need for exposing the metallic components to the environment (presented with a different matching structure and a reflector in [30]). Modifying systems without exposing metallic components is especially useful in harsh and corrosive environments like the deck of a ship or in coastal cities, where salt water can quickly degrade materials if not properly sealed [31] after installation. Modular systems provide advantages to maritime operators and city planners allowing them to reuse previous infrastructure, when older systems are replaced.…”

Section: Capacitively Coupled Disk Loaded Monopolementioning

confidence: 99%

Indirect Applications of Additive Manufacturing for Antennas

Lundquist

Linkous

Hasni

et al. 2023

IEEE Open J. Antennas Propag.

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We report the fabrication methodology of stereolithography (SLA) printed molds for metal and resin cast antennas. In the first method, a conical horn created using metal cast molds printed from a glassfilled resin utilizes a casting technique allowing for low-cost 3D printing to fabricate metal antennas, reducing the losses incurred by metallized plastics, while still producing complex geometries quickly. This metal cast conical horn is compared to a horn constructed using a more traditional 3D printing method. The second casting method demonstrates the interchangeability between creating parts via SLA printing with a glassfilled resin and using the same resin cast into a reusable Polydimethylsiloxane (PDMS) mold. We demonstrate this method by casting an interchangeable slug for a capacitively coupled, mechanically reconfigurable disk loaded monopole. Simulated and experimental data are presented for S11, and Gain. Simulated BW, directivity, gain and efficiency as a function of frequency are presented. The results indicate that the 3D printed metal casting process produces antennas with a higher gain and lower return loss than metallized resin antennas. The method is suitable for difficult geometries requiring resolution of at least 50 µm. The capacitively coupled disk loaded monopole demonstrates the versatility of 3D printing in antenna fabrication.INDEX TERMS 3D printed antenna, disk loaded monopole, conical horn, metal casting, resin casting

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Section: Capacitively Coupled Disk Loaded Monopolementioning

confidence: 99%

Indirect Applications of Additive Manufacturing for Antennas

Lundquist

Linkous

Hasni

et al. 2023

IEEE Open J. Antennas Propag.

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“…N order to improve the combat capability, modern warships need to equip multiple antennas to be responsible for target recognition, fire control tracking, navigation, electronic reconnaissance countermeasure, wireless communication and many other functions. As a result, there are too many antennas on the shipborne platform system, which brings a series of problems 1,2 such as equipment shielding, electromagnetic interference (EMI), radar cross section (RCS) enlargement and so on. To this end, the researchers proposed multifunction radio frequency (RF) technology.…”

Section: Introductionmentioning

confidence: 99%

Metasurface‐enabled isolation between antenna arrays

Zhang

Wang

Han

et al. 2022

Int J RF Mic Comp-Aid Eng

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In this article, we propose a method of achieving broadband decoupling between large antenna arrays using magnetic metasurface (MM). To realize broadband isolation performance, the MM consists of four sub-regions composed periodic arrays of split-ring resonators (SRRs). The four sub-regions can achieve negative permeability in sequential frequency ranges, which can together cover the whole X-band by proper combinations. When the MM is placed between the antenna arrays, the propagation of the coupled electromagnetic waves will be suppressed due to the negative permeability, so the isolation between the antenna arrays will be enhanced. For simplicity, the broadband decoupling performance of MM is verified by using patch antenna elements. Prototypes were fabricated and measured. Both simulated and measured results show that when the distance between the two antenna elements is about half a meter, the isolation can be enhanced by at least 25.0 dB in the whole X-band, which convincingly verifies our method. This work provides an alternative to enhancing isolation between broadband antenna arrays and may find applications in electromagnetic compatibility of integrated masts, base stations, and so on.

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