Holographic-Inspired Multibeam Reflectarray With Linear Polarization

Karimipour, Majid; Komjani, Nader

doi:10.1109/tap.2018.2823776

Cited by 50 publications

(22 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that in reflector-based holograms, Z ( x , y ) accommodates with the input impedance concept, which is the ratio of tangential electric field to tangential magnetic field of the space wave near the reflecting surface. This is why, as opposed to conventional holographic structures, we treat a space wave instead of a surface wave in reflector-based holograms 39 . Specifically, as expressed in leaky wave structures, if object waves are of pencil beam type, the relevant near field distribution of the waves will be in form of rect function with a uniform profile, and hence, the hologram for multiple object beams is characterized with the superposition of the corresponding rect functions.…”

Section: Resultsmentioning

confidence: 99%

Shaping Electromagnetic Waves with Flexible and Continuous Control of the Beam Directions Using Holography and Convolution Theorem

Karimipour

Komjani

Aryanian

2019

Sci Rep

Self Cite

View full text Add to dashboard Cite

In this article, several versatile electromagnetic (EM) waves are presented with predefined shapes and directions based on the holography and convolution theorem. Inspiring the holography theory, a reflective interferogram is characterized by interfering the near field distributions of the object and reference waves. In this regard, the interference pattern on the hologram could be viewed as the inverse Fourier transform of the object and reference waves. Therefore, the capability of steering the EM shaped beam is realized using the convolution theorem (as an interesting property of the Fourier transform), which makes a link between the hologram impedance-pattern and far-field pattern domains. The main advantage of incorporating the holography concept and convolution theorem is realizing arbitrary shaped-beam EM waves with the possibility of flexible manipulation of the beam directions without employing any optimization algorithm and mathematical computation. It is demonstrated that the method could implement a combination of simple beams (such as collimated beams) and complex beams (such as cosecant squared, flat top, isoflux beams, etc.) with each beam possessing arbitrary direction by the same design topology. To experimentally verify the concept, a prototype of the hologram with three separate beams including two tilted cosecant squared shaped beam and one broadside pencil beam is fabricated and measured. The measured results show a significant agreement between theoretical findings.

show abstract

Section: Resultsmentioning

confidence: 99%

Shaping Electromagnetic Waves with Flexible and Continuous Control of the Beam Directions Using Holography and Convolution Theorem

Karimipour

Komjani

Aryanian

2019

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…Considering the holographic technique, the reflecting surface (which is called the hologram) of reflectarray acts as a continuous impedance surface similar to the one reported in [24]. Specifically, the authors in [21] showed that the developed reflectarray based on the holographic method provided remarkable 1-dB gain bandwidth due to applying subwavelength unit cells. In doing so, some proper impedance unit cells were employed to sample locally the predefined impedance distribution on the hologram surface, which was enforced by the holographic theory.…”

Section: Introductionmentioning

confidence: 88%

“…In most cases, the reference wave is considered as the secondary wave [25]. It is customary that the hologram surface is described by the surface impedance or admittance quantities [21]. Since in reflectarray antenna we deal with space waves, instead of surface wave (the last wave is the case of leaky wave antenna, in which the excitation is surface wave), the hologram surface should be described based on the input impedance or admittance quantity.…”

Section: Hologram Descriptionmentioning

confidence: 99%

“…In this paper, we propose an assessed approach based on the holographic theory to design a dual-band broadband multi-beam reflectarray. The holographic-inspired approach is a novel attitude towards the reflectarray functionality which has been lately reported in our works [21][22][23] to develop several versatile pencil beam radiation patterns. Considering the holographic technique, the reflecting surface (which is called the hologram) of reflectarray acts as a continuous impedance surface similar to the one reported in [24].…”

Section: Introductionmentioning

confidence: 99%

“…In doing so, some proper impedance unit cells were employed to sample locally the predefined impedance distribution on the hologram surface, which was enforced by the holographic theory. We aim to extend the idea proposed behind the potential paper of Karimipour and Komjani [21] and design a broadband dual-band multi-beam reflectarray. The main advantage of the proposed method is the realisation of all the requirements needed for dualband operation by employing only one set of single-layered unit cells with minimal complexity.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Broadband, dual‐band reflectarray with dual orthogonal polarisation for single and multi‐beam patterns

Karimipour

Komjani

Aryanian

2019

IET Microwaves, Antennas & Propagation

Self Cite

View full text Add to dashboard Cite

Two single‐layered broadband dual‐band dual orthogonal polarisation reflectarrays are designed and developed in the X‐ and Ku‐bands. The well‐known holographic technique is employed such that one antenna generates a single radiation beam in two bands and another generates a five‐beam pattern in two bands simultaneously. For both antennas, a subwavelength Jerusalem‐Shaped unit cell is employed to independently realise two impedance distributions for each band and, consequently, not only broaden the operational bandwidths for both bands, but also limit the mutual coupling between two sets of impedances. As a typical case, an X/Ku band 20 cm × 20 cm five‐beam dual‐band reflectarray with dual linear polarisation is designed and fabricated for the experimental verification. The measurement results show that the fabricated antenna has 21% 1‐dB gain bandwidth (from 8.5 to 10.5 GHz) with vertical polarisation and has 8.8% 1‐dB gain bandwidth (from 14.65 to 16 GHz) with horizontal polarisation. Furthermore, the maximum measured aperture efficiencies in the X‐ and Ku‐bands are 57 and 69%, respectively.

show abstract

Metallic cross bow‐ties on low‐cost substrate as a broadband reflectarray antenna

Asgari

Shahzadi

2022

Int J RF Mic Comp-Aid Eng

View full text Add to dashboard Cite

In this article, a center-fed reflectarray antenna constituted of subwavelength cross-bow-tie elements on FR4 substrate is proposed. The additional freedom degree of such element allows obtaining more linear phase range needed to design a broadband reflectarrays. Using this type of element, a low-cost singlelayer reflectarray for X-band (9.3-11.6 GHz) is designed. Such an array is illuminated by a designed horn antenna with small aperture size and maximum gain 13.3 dBi in the central frequency. To verify the obtained numerical results, the simulated structure is fabricated and successfully measured. In spite of utilizing thick lossy substrate, the measurements on a 270 mm Â 270 mm and F/D = 0.98 reflectarray show a maximum gain of 27.03 dBi with a 1-dB gain bandwidth of 22%, and an efficiency of 45% at 10.5 GHz.

show abstract

Holographic-Inspired Multibeam Reflectarray With Linear Polarization

Cited by 50 publications

References 33 publications

Shaping Electromagnetic Waves with Flexible and Continuous Control of the Beam Directions Using Holography and Convolution Theorem

Shaping Electromagnetic Waves with Flexible and Continuous Control of the Beam Directions Using Holography and Convolution Theorem

Broadband, dual‐band reflectarray with dual orthogonal polarisation for single and multi‐beam patterns

Metallic cross bow‐ties on low‐cost substrate as a broadband reflectarray antenna

Contact Info

Product

Resources

About