Dielectric Phase-Correcting Structures for Electromagnetic Band Gap Resonator Antennas

Afzal, Muhammad U.; Esselle, Karu P.; Zeb, Basit Ali

doi:10.1109/tap.2015.2438332

Cited by 101 publications

(69 citation statements)

References 36 publications

(31 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In phased arrays, the phase delay is achieved using external radio frequency (RF) phase shifters that are inserted in the RF path before the antenna elements. A different approach to effectively tilt the array beam by introducing the phase delay through a free-standing near-field phase-transforming structure is used here [20]. These phasetransforming structures have spatially distributed phaseshifting cells to locally transform the phase of the incoming electric field into a desired phase of the outgoing field.…”

Section: Physics Of Beam-scanning Methodsmentioning

confidence: 99%

“…This strategy of manipulating the phase of the radiated field has some advantages in terms of cost and power losses when compared with phase shifters in arrays. One type of free-standing phase-transforming structure is made from dielectric materials [20], [21]. It is well-known that the wavelength of electric field propagating inside a dielectric is less than that in the free space, which is expressed as λ g = λ 0 / √ ε r , where λ 0 is the free space wavelength and ε r is the relative permittivity of the dielectric.…”

Section: Physics Of Beam-scanning Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Beam-Scanning Antenna Based on Near-Electric Field Phase Transformation and Refraction of Electromagnetic Wave Through Dielectric Structures

et al. 2020

Self Cite

View full text Add to dashboard Cite

An elegant combination of electric near-field phase transformation technique and electromagnetic-wave refraction, implemented through a pair of 3D printed dielectric structures, has been used to demonstrate a Ka-band beam-scanning antenna system. The system comprises a resonant-cavity antenna (RCA), which is used as a base antenna, a stepped dielectric (SD), and a dielectric wedge (DW). The SD is suspended above RCA in the near-field region to focus its broadside beam at an offset angle of 20 •. The DW is placed above the SD and its two opening angles are selected such that the offset-angle focused beam tilts further and moves back to the broadside when the DW is co-and counter-aligned with the SD, respectively. The total height of the antenna system is 8.1λ 0 , where λ 0 is the free-space wavelength at the operating frequency of 30 GHz. The total cost of the material used for printing the two dielectric structures in prototyping is only 6 USD. It has been demonstrated through measurements of the prototype that by rotating the DW around its own axis, the antenna beam can be scanned in both azimuth and elevation planes. The measured results indicate that antenna beam can effectively be scanned to any arbitrary angular position within a conical region having an apex angle of 68 • , while maintaining peak-gain value within the 3 dB limit of the maximum gain of 16 dBi. INDEX TERMS beam-scanning, beam-steering, low-cost antennas, phase-shifting structures, rapid prototyping, resonant-cavity antenna, 3D printing

show abstract

Section: Physics Of Beam-scanning Methodsmentioning

confidence: 99%

Section: Physics Of Beam-scanning Methodsmentioning

confidence: 99%

Beam-Scanning Antenna Based on Near-Electric Field Phase Transformation and Refraction of Electromagnetic Wave Through Dielectric Structures

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, this structure has high back lobe. Interestingly, the EBG resonator antenna (ERA) with phasecorrecting structures (PCS) superstrate in [28] achieved the highest gain (21.2 dBi), suffered from the fabrication challenge due to the PCS design. All in all, the proposed antenna (i.e., the microstrip antenna with HIS and FSS) could achieve a relatively high gain (10.14 dBi), given its compact size and low profile.…”

Section: Measurements Of the His-fss-integrated Microstripmentioning

confidence: 99%

Improved Microstrip Antenna with HIS Elements and FSS Superstrate for 2.4 GHz Band Applications

Arnmanee

Phongcharoenpanich

2018

International Journal of Antennas and Propagation

View full text Add to dashboard Cite

This research presents a microstrip antenna integrated with the high-impedance surface (HIS) elements and the modified frequency selective surface (FSS) superstrate for 2.4 GHz band applications. The electromagnetic band gap (EBG) structure was utilized in the fabrication of both the HIS and FSS structures. An FR-4 substrate with 120 mm × 120 mm × 0.8 mm in dimension (W × L × T) and a dielectric constant of 4.3 was used in the antenna design. In the antenna development, the HIS elemental structure was mounted onto the antenna substrate around the radiation patch to suppress the surface wave, and the modified FSS superstrate was suspended 20 mm above the radiating patch to improve the directivity. Simulations were carried out to determine the optimal dimensions of the components and the antenna prototype subsequently fabricated and tested. The simulation and measured results were agreeable. The experimental results revealed that the proposed integrated antenna (i.e., the microstrip antenna with the HIS and FSS structures) outperformed the conventional microstrip antenna with regard to reflection coefficient, the radiation pattern, gain, and radiation efficiency. Specifically, the proposed antenna could achieve the measured antenna gain of 10.14 dBi at 2.45 GHz and the reflection coefficient of less than −10 dB and was operable in the 2.39-2.51 GHz frequency range.

show abstract

“…For validation purpose, two well‐known Fabry‐Perot antennas have been studied. The first antenna has an homogeneous PRS (EBG‐1D) of finite size and the second one has an inhomogeneous gradient index PRS (Luneburg Lens) . Then, a new inhomogeneous PRS design is proposed to reduce the SLL.…”

Section: Introductionmentioning

confidence: 99%

A new inhomogeneous partially reflecting surface for Fabry‐Perot antenna to reduce side lobe level

Zaiter

Raveu

Oussaid

2020

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

In this article, an extension of the spatial filter method to study Fabry‐Perot antennas with homogeneous or inhomogeneous partially reflecting surface (PRS) of finite size is proposed. This tool was subsequently validated through the study of different Fabry‐Perot antennas, with homogeneous PRS and inhomogeneous GRadient‐INdex (GRIN) PRS that present very high side lobe level (SLL). Since they are due to structure truncation, a new inhomogeneous PRS to reduce the SLL is designed with the new analytical tool. The new inhomogeneous PRS for Fabry‐Perot antenna is characterized by simulations and measurements. Compared to the homogeneous PRS antenna, the proposed PRS allows a SLL reduction of 5 dB without decreasing the 14 dBi directivity.

show abstract

Dielectric Phase-Correcting Structures for Electromagnetic Band Gap Resonator Antennas

Cited by 101 publications

References 36 publications

Beam-Scanning Antenna Based on Near-Electric Field Phase Transformation and Refraction of Electromagnetic Wave Through Dielectric Structures

Beam-Scanning Antenna Based on Near-Electric Field Phase Transformation and Refraction of Electromagnetic Wave Through Dielectric Structures

Improved Microstrip Antenna with HIS Elements and FSS Superstrate for 2.4 GHz Band Applications

A new inhomogeneous partially reflecting surface for Fabry‐Perot antenna to reduce side lobe level

Contact Info

Product

Resources

About