Both regular-size and compact dual-frequency designs are discussed, which should give the reader a more complete view of recent developments in dual-frequency design. For an optimal experience, please consider upgrading to the most recent version of your browser. The liquid metal is contained in a 1 × 1 mm channel etched in a polymethyl methacrylate cylinder. The designed antenna works in 5. The proposed antenna in this work combines a low profile cylindrical cavity back, a parasitic patch and a reconfigurable antenna in a novel structure in order to increase the impedance, 3 dB axial ratio bandwidths and the gain. Design is done with simulation verification of the problem and testing of two prototype circuits. The state of the gaps can be adjusted by pin diodes' state.
A circularly polarized rectangular dielectric resonator antenna is presented. The authors present the design of a wideband circularly polarised antenna with switchable polarisation sense. This design demonstrates useful features for wireless communication applications and future planetary missions. The aim was for obtaining polarization diversity. From the measured result, low cross-polarization levels in the linear state and good axial ratios in the circular state are observed.
Consequently, the polarization excited by the proposed antenna can be switched into three types, either linear polarization, left-hand circular polarization or right-hand circular polarization. The antenna achieves an impedance bandwidth 3. The measured reflection coefficient bandwidth is 18. Somasekhar Rao obtained his B. Thus, the polarization of the proposed antenna changes electrically at the two resonant frequencies. Recent advances in regular-size dual-frequency designs are first discussed, and then designs for achieving compact dual-frequency operation with same-polarization and orthogonal polarization planes are described in detail. Measured impedance and axial ratio bandwidths are 28.
This antenna shows dual resonance f1 and f2 with linear polarizations that are orthogonal to each other. Antenna Design This letter proposes a novel microstrip resonator that can perform filtering and radiating functions simultaneously. Radiation patterns exhibit unidirectional and stable quality from the point view of beam slant and split. The radiation pattern of the proposed antenna can changed into three modes. With the design, different ground structure was proposed with L-shaped nature with a meandering slit on the patch which yielded two resonances at 2. A wideband circular-monopolar patch surrounded by eight reconfigurable coupling loop stubs can generate conical-beam radiation patterns with different polarizations. Frequency and beam reconfigurable antenna using photoconducting switches.
In this letter, a novel polarization reconfigurable antenna with a T-shaped feed is proposed. By introducing corner truncated perturbation on opposite corners of right diagonal of a square patch, orthogonal circular polarizations are achieved. A wideband antenna with quad-polarization reconfigurable operation is proposed. She has 11 years of teaching experience. Degree in Microwave and Radar Engg. Wideband reconfigurable rolled planar monopole antenna.
The chapter discusses many of the important issues surrounding the practical implementation of the reconfigurable microstrip antennas, including control circuitry design and trade-offs between different reconfiguration mechanisms. Experimental results agree with the simulation and show that the proposed antenna well works in all polarization modes with desirable electrical characteristics. This chapter addresses recent advances in development of reconfigurable microstrip antennas, with an emphasis not only on the antennas themselves, but also on the practical issues surrounding their implementation, including control and system-level design and performance. A polarization reconfigurable patch antenna with electric current disturbance is proposed in this paper. To validate the proposed design, the antenna was fabricated and its performance was measured.
Bharathi was born in Telangana, India in 1978. Three different approaches to embed actives are discussed: a face up, b face-down, and c side mount. In addition, the proposed design can offer more reconfigurable linear polarization directions by adding more switchable paths in the feed network. There is a more recent version of your browser available. The double E shaped patch antenna operates in multiband frequency with gain obtained from 7dB—9dB. Two orthogonal slots are incorporated into the patch and two pin diodes are utilized to switch the slots on and off. Measured results show that the metallic reflector placed at the back of the antenna increases the boresight gain by 5 dBi.
This study presents a dual-band polarization-reconfigurable antenna that comprises a large square patch with a pair of corner-cut edges and two small square patches with a shorting via. The antenna is composed of two meandered monopoles perpendicular to each other, a switchable feeding network and a metallic reflector. Thus, the polarization of the proposed antenna changes electrically at the two resonant frequencies. The power divider divides the input signal into two signals with equal amplitude and 90°-phase difference. Three switches are positioned in the slot thus produces six reconfigurable frequency bands. Rectangular microstrip patch antennas, although having many advantages, usually suffer from having narrow bandwidth. Good measured of simulated results are obtained at the targeted operating frequency.