A Dual-Band CPW-Fed L-Slot Antenna With Both Linear and Circular Polarizations

Abstract

A design procedure for a dual-band CPW-fed linearly and circularly polarized (CP) antenna based on the L-shaped slot antenna is presented in this paper. The slot antenna and the feeding structure are fabricated on the same plane of the substrate so that circuit processes and position alignment can be simplified. By shortening the length of one arm of the L-slot, an additional mode with two orthogonal electrical fields with a phase difference of 90 degree is excited, so that the circularly polarized wave can also be excited. The enhancement of the resonant bandwidth is achieved by utilizing a stub-protruded feedline, adding one finger slit at the other arm slot, and tuning the dimension of the ground plane. A bandwidth of 22.0% (2.23-2.78 GHz) is achieved with an axial ratio < 3 dB for the optimized case.

CPW-Fed Circularly Polarized Slot Antenna

“…The antenna geometry is given in [1] as shown in fig. 1 and design parameter is given in TABLEI The modified design are fabricated on 0.8 mm thick FR-4 substrate having a dielectric constant εr = 4.4 and tan δ of 0.0245 and a ground plane size of 66x66.…”

“…1 and design parameter is given in TABLEI The modified design are fabricated on 0.8 mm thick FR-4 substrate having a dielectric constant εr = 4.4 and tan δ of 0.0245 and a ground plane size of 66x66. In design [1] a dual-band CPW-fed L-shaped slot antenna with both linear and circular polarizations is demonstrated. The CP radiation is produced by properly adjusting the two unequal side lengths of the L-slot.…”

“…The design modified antenna gives better AR as compare to given in [1]. The modified antenna consist of CPW feed line, a L slot, modified protruded stub, with truncated corner apposite to feed line and all other parameters are remains same as given in design [1]. The modified antenna configuration is given in TABLE II and geometry is as shown in fig.…”

“…Now a days the development of wireless network required microstrip antenna in many application. Suspended microstrip antenna in which radiating patch and the feed strip are etched on the substrate of thickness "h" mm [1]. A basic structure MSA radiates linear polarized wave and having lower bandwidth.…”

Lumped Dual-Frequency Impedance Transformers for Frequency-Dependent Complex Loads

“…Recently as dual-band microwave components are becoming a trend [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16], the demand for dual-frequency impedance transformers has been increasing. Dual-frequency impedance matching were firstly realized between real impedances [17,18].…”