Novel dual band patch antenna With Gap coupled composite right/left-handed transmission line

Abstract

A novel low profile dual band patch antenna is presented. It consists of a composite right/left-handed transmission line (CRLH TL) unit cell gap coupled with the radiating edge of a rectangular patch antenna. The dual band behavior is achieved by coupling the zeroth order resonance mode of CRLH TL and TM10mode of the patch antenna. It is shown that frequency ratio can be changed by varying the gap between the patch and CRLH TL unit cell. The proposed configuration enables frequency reconfigurability by changing the CRLH TL unit cell using a switch. A prototype of the antenna having frequency ratiof2/f1= 1.08 is designed and fabricated. The proposed antenna shows measuredS11≤ −10 dB bandwidth of 100 and 50 MHz at resonance frequencies off1= 4.84 andf2= 5.22 GHz, respectively. A 2 × 2 dual band CRLH TL coupled patch array is also presented, showing more than 12.7 dBi gain at both resonance frequencies.

A review on microstrip patch antenna parameters of different geometry and bandwidth enhancement techniques

“…11 in Table 11. The antennas [113][114][115][116][117][118] reported at S. No. 11 in Table 11 have utilized the CRLH-TL technique to enhance the bandwidth.…”

“…The antenna [117] utilizes the CPW and stub for circular polarization (impedance bandwidth of 1770 MHz between 3.78 and 5.55 GHz and ARBW of 1750 MHz between 3.50 and 5.25 GHz) and band notch with slit loaded (impedance bandwidth of 2200 MHz between 3.28 and 5.48 GHz with a band notch from 4.18 to 4.65 GHz). The antenna [118] has been designed with CRLH-TL approach and gap coupled concept results dual-band characteristic at 4.84 and 5.22 GHz resonance with the impedance bandwidth of 100 and 50 MHz, respectively.…”