Leaky-wave Antenna Research Articles

A Vertically-Polarized Endfire Leaky-Wave Antenna with Flexible Control of Propagation Constants

A Vertically-Polarized Endfire Leaky-Wave Antenna with Flexible Control of Propagation Constants

SIW TE10/TE30 Mode Circularly Polarized Leaky-Wave Antenna with Dielectric Resonator

SIW TE10/TE30 Mode Circularly Polarized Leaky-Wave Antenna with Dielectric Resonator

On the Asymptotic Evaluation of the Radiative Near-Field in Resonant Leaky-Wave Antennas Using a Non-Uniform Phase Center: Application to Small Lenses

On the Asymptotic Evaluation of the Radiative Near-Field in Resonant Leaky-Wave Antennas Using a Non-Uniform Phase Center: Application to Small Lenses

A Single-Layer Periodic Leaky-Wave Antenna With Full-Space Scanning Capability

A Single-Layer Periodic Leaky-Wave Antenna With Full-Space Scanning Capability

Ray-Tracing and Physical Optics Modeling of Leaky-Wave Antennas Combined with Lenses

Ray-Tracing and Physical Optics Modeling of Leaky-Wave Antennas Combined with Lenses

One-Dimensional Leaky Wave Antennas With Narrow Beam and Low Sidelobes

One-Dimensional Leaky Wave Antennas With Narrow Beam and Low Sidelobes

High Endfire Gain Dielectric Image Line Based Periodic Leaky-wave Antenna with Planar Feeding

High Endfire Gain Dielectric Image Line Based Periodic Leaky-wave Antenna with Planar Feeding

Effective Epsilon-Mu-Near-Zero Photonic Crystal with Low-Permittivity Substrate for Broadside-Beam Leaky-Wave Antenna

Effective Epsilon-Mu-Near-Zero Photonic Crystal with Low-Permittivity Substrate for Broadside-Beam Leaky-Wave Antenna

Meandering Microstrip Leaky Wave Antenna With Dual-Band Linear–Circular Polarization and Suppressed Open Stopband

Meandering Microstrip Leaky Wave Antenna With Dual-Band Linear–Circular Polarization and Suppressed Open Stopband

Compact 2-D Frequency Scanning Leaky-Wave Antenna Array with Cyclically Progressive Phase-Shifting Feeding Network

Compact 2-D Frequency Scanning Leaky-Wave Antenna Array with Cyclically Progressive Phase-Shifting Feeding Network

Dual Circularly Polarized and Linearly Sweeping Leaky-Wave Antenna

Dual Circularly Polarized and Linearly Sweeping Leaky-Wave Antenna

An externally perceivable smart leaky-wave antenna based on spoof surface plasmon polaritons

An externally perceivable smart leaky-wave antenna based on spoof surface plasmon polaritons

Vortex circular airy beams through leaky-wave antennas

A novel method to design leaky-wave antennas radiating vortex cylindrical Airy beams at microwave frequencies is here presented. Two different approaches are adopted to produce waves with a nonzero orbital angular momentum (OAM): one based on a bull’s eye design excited by a uniform circular array of vertical coaxial probes with proper azimuthal phase delay, and one based on a single coaxial feeder exciting a multi-spiral radiator. Both of them take advantage of backward radial propagation of cylindrical leaky waves promoting circular Airy beams with vortex patterns. The OAM state can be changed by either varying the probe phasing or the number of spiral units. A reference profile is designed under transverse-electric and transverse-magnetic excitation independently. Numerical full-wave analysis are performed using different angular states to validate the antenna design, as well to highlight the different advantages of the two alternative design approaches.

High-Efficiency Leaky Wave Antenna Based on Periodic Field-Distribution Modulation of Single-Conductor Comb Lines

High-Efficiency Leaky Wave Antenna Based on Periodic Field-Distribution Modulation of Single-Conductor Comb Lines

A slotted metagratings leaky-wave antenna with theoretical analysis

In this contribution, a new slotted metagratings based leaky-wave antenna (MGs LWA) featuring a wide beam-scanning is presented to overcome the limitation of the mutual coupling and the open-stopband effects in traditional LWA. The MGs LWA is comprised of a parallel-plate waveguide with a periodic MGs array etched on the top plate over a dielectric substrate with PEC-backed. An analytical theory is created as a conceptual model for the corresponding equivalent electromagnetic fields produced by slotted MGs, that generate the Z-matrix and S-matrix for a two-port structure from the electric and magnetic fields. Furthermore, an approximate analysis is derived using Green’s function to quantify mutual admittance coupling. This antenna has excellent success due to its ability to achieve a wide beam-scanning range with a high realized gain while still having a narrow beam width in the E-plane. With the utilizing results, the bandwidth range of 64% with continuous beam-scanned of 74° and narrow angular beamwidth up to 11.1° in the E-plane is obtained. Meanwhile, the beam-scanned sensitivity is 5.4°/GHz. The realized gain is up to 16.3 dBi. Finally, the MGs LWA is fabricated to approve the theoretical and simulation results. Thus, a low permittivity and thin substrate are selected to enable perfect beam-scanning for 5 G high-speed mobile communication systems.

Non-invasive antenna sensor for dielectric material identification at a distance

A planar leaky wave antenna is used as a non-invasive microwave sensor for dielectric material identification at a distance. The antenna radiation pattern main lobe points to specific angles according to the dielectric material under test, placed above the antenna. In this work, two materials were used, and compared to the antenna with no material under test, namely quartz with a dielectric constant of 3.75 and borosilicate glass with a dielectric constant of 4.5. The antenna sensor described in this work, is designed to operate at 18 GHz and has a total dimension of 150 × 32 mm. The experimental methods used in this work consist of validating the sensor antenna design in Ansys HFSS®, electromagnetic simulation software and comparing simulated results with measured tests performed in an anechoic chamber. Dielectrics are placed over the sensor antenna and measured radiation patterns recorded. The sensor antenna presented displacement in the main lobe of its radiation pattern when in contact with a dielectric under test. In the presence of quartz, the maximum radiation angle is 33°, in the presence of borosilicate glass the angle shifted to 37°.

Optimized Leaky-Wave Antenna for Hyperthermia in Biological Tissue Theoretical Model.

In this paper, we exploit the enhanced penetration reachable through inhomogeneous waves to induce hyperthermia in biological tissues. We will present a leaky-wave antenna inspired by the Menzel antenna which has been shortened through opportune design and optimizations and that has been designed to optimize the penetration at the interface with the skin, allowing penetration in the skin layer at a constant temperature, and enhanced penetration in the overall structure considered. Past papers both numerically and analytically demonstrated the possibility of reducing the attenuation that the electromagnetic waves are subject to when travelling inside a lossy medium by using inhomogeneous waves. In those papers, a structure (the leaky-wave antenna) is shown to allow the effect, but such a radiator suffers from low efficiency. Also, at the frequencies that are most used for hyperthermia application, a classical leaky-wave antenna would be too long; here is where the idea of the shortened leaky-wave arises. To numerically analyze the penetration in biological tissues, this paper considers a numerical prototype of a sample of flesh, composed of superficial skin layers, followed by fat and an undefined layer of muscles.

A SIW Based Leaky Wave Antenna for Aerospace Applications in X Band

In the rapidly advancing field of aerospace communication and radar systems, the demand for high performance antennas operating in the X-band frequency range has increased significantly. For high speed communication, precise navigation, and accurate detection the antenna in X band is required. In this paper, the design and analysis of a substrate integrated waveguide (SIW)-based antenna for aerospace applications operating at a frequency of 10.5 GHz. The proposed antenna design integrates the benefits of SIW technology, such as low loss, compact size, and compatibility with planar fabrication techniques, making it suitable for space-constrained aerospace platforms. The antenna had gain of 9.34 dBi, s11 of design is -28.3 at 10.5 GHz. The radiation pattern is approximately omnidirectional.

Wideband Fixed-Beam Single-Piece Leaky Wave Antenna With Controlled Dispersion Slope

Wideband Fixed-Beam Single-Piece Leaky Wave Antenna With Controlled Dispersion Slope

Monopulse Leaky Wave Antennas for RSSI-Based Direction Finding in Wireless Local Area Networks

Monopulse Leaky Wave Antennas for RSSI-Based Direction Finding in Wireless Local Area Networks