S. Ali Hosseini

Design of a single-feed all-metal 63 GHz Fabry-Perot cavity antenna using a TL and a wideband circuit model

In this paper, we show a wideband transmission line (TL) model for a Fabry-Perot cavity (FPC) antenna which is designed at a center frequency of 63 GHz using a thick and slotted metallic partially reflective surface. Then, by using the proposed wideband circuit model, we predict the gain and 3dB gain bandwidth of the antenna, assumed as infinitely large in the transverse domain (for the modeling purposes). Finally we compared the circuit model results to the full-wave ones for a FPC antenna of finite extent.

A 44 GHz single-Feed Fabry-Pérot Cavity antenna designed and fabricated on quartz

In this paper, a design of Fabry-Pérot Cavity antenna at millimiter-waves frequencies is investigated. Four Fabry-Pérot cavity antennas, covered by different Frequency Selective Surfaces, are discussed which are fabricated on a Quartz disk to guarantee mechanical stability and also for ease of fabrication, probing and measurement. A planar feed, a slot dipole fed by a coplanar waveguide, is also designed to excite the cavities. Prototypes have been designed and fabricated at central frequencies in frequency range of 42 to 46 GHz with various gains; however the same design can be adopted at higher frequencies. Full-wave simulations, done by Ansys HFSS, are verified with measurement results.

Design of a single-feed 60 GHz planar metallic Fabry-Perot cavity antenna with 20 dB gain

In this paper a Fabry-Perot cavity (FPC) has been used to design a 60 GHz single feed directive antenna. The FPC antenna is made by a ground plane covered by a frequency selective surface (FSS). We have provided simple design guidelines based on a transmission line model. Numerical simulations confirm the design guidelines and antenna performances.

A highly-efficient single-feed planar Fabry-Pérot cavity antenna for 60 GHz technology

A low-loss planar Fabry-Pérot cavity antenna fed by a planar feed, a CPW-fed slot dipole, is designed and fabricated for 60 GHz wireless systems. The antenna is fabricated on a planar substrate using standard lithography process. The measurement results of the fabricated antenna are in good agreement with simulation data and show a gain of 16.5 dB.

Gain-bandwidth enhancement of 60GHz single-layer Fabry-Pérot cavity antennas using sparse-array

Gain enhancement of a 60 GHz Fabry-Pérot cavity antenna is obtained through excitation of the resonant cavity using a 4-element sparse-array. The antenna design is very simple and consists of a single-layer dielectric-based structure with thin layers of copper being printed on the top and bottom forming the ground/feed and the frequency-selective surface. Full-wave simulation results verify the desired performance of the antenna.

Single-feed highly-directive Fabry-Perot Cavity antenna for 60 GHz wireless systems: Design and fabrication

In this paper, a prototype Fabry-Perot Cavity (FPC) antenna is designed and fabricated at millimeter-wave frequencies, aiming at designing directive antennas for 60 GHz wireless systems. A prototype FPC antenna is designed to have 17 dB gain at 42.8 GHz with 600–700 MHz 3dB-pattern-bandwidth and it is designed in order to be mounted on a wafer (chip). Measurement tools at millimeter frequencies and also antenna integration possibilities lead us to design an efficient feeding network for this kind of antenna. The antenna is fabricated on a quartz wafer (very low loss dielectric especially at millimeter-wave frequencies) which is coated by a thin layer of gold on each side. All the simulations on the reflection coefficient, gain and the radiation pattern of the antenna are done and compared using two most powerful EM simulators, Ansoft HFSS and Zeland IE3D and they are also compared with some measurement results for the prototype antenna.

A new dual-band antenna controlled by reconfigurable notch filters

In this work, a new dual-band antenna, operating at two frequency-bands centered at 4.7 GHz and 7.5 GHz, is proposed which its operational frequency band is controlled by using reconfigurable notch filters. The idea is developed here for both case of ideal (MEMS) and non-ideal(Semiconductor diodes) switches. The simulations done by IE3D for each design, are verified with measurements.

A dual polarized near-field focusing plate at microwave frequencies providing sub-wavelength focusing in two dimensions

In this work we introduce a novel near-field focusing plate able to provide sub-wavelength focusing in both directions, parallel to the plate, as well as for both polarizations of the illuminating plane wave at microwave frequencies. Two similar designs are proposed: the first one is made of a thick metallic plate, whereas the second one is made of a thin copper plate fabricated on top of a Rogers 5880 dielectric substrate. The focusing behavior of these structures is analyzed with Ansys HFSS and CST Microwave Studio full-wave simulators.

Dual polarized near-field focusing plate for near-field optical focusing in two dimensions

We introduce a dual polarized near-field focusing plate (DP-NFFP) with focusing in two dimensions, designed to operate at the near infrared frequency of 193 THz (λ(0) = 1550 nm). Subwavelength focusing in two dimensions, for both incident polarizations, is achieved at a distance of a quarter wavelength from the DP-NFFP. The design procedure is described in detail and the proposed design could be easily scaled to other working frequencies, from microwave to optics. We show that the use of ideal lossless (i.e., perfect electric conductor) or real lossy (i.e., silver) metals provide with subwavelength focusing at 193 THz, indicating that metal losses do not significantly affect the DP-NFFP performance, and thus confirming the design feasibility at the near-infrared frequency. Results are validated by using two distinct full-wave simulators.

A 63 GHz single-feed low-profile Fabry-Pérot cavity antenna using a thick metallic FSS

A simple solution for a 63 GHz planar single-feed Fabry-Pérot cavity (FPC) antenna covered by a thick metallic frequency selective surface (FFS) is proposed. The antenna is fed through a planar feed consisting of a coplanar-waveguide-fed slot on the ground plane of the cavity. The FSS is made of periodic circular slots in a thick Brass plate. Moreover, the sides of the metallic FSS are terminated with vertical metallic walls leading to a self-supported low-profile FPC filled with air. Good agreement is observed between measured and simulated results.