Compact circularly polarized ZOR and for antenna employing crlh transmission lines

Abstract

A metamaterial-inspired dual-band antenna with circular polarization is presented in this article. To achieve composite right/lefthand (CRLH) resonance and circularly polarized (CP) properties, three meander lines act as the shunt inductance, and two slots act as series capacitance. The asymmetric CRLH antenna fed by a coplanar waveguide (CPW) realizes zeroth-order resonance and first-order resonance. The dual-band and CP antenna can work in a 3 dB axial-ratio bandwidth as much as 8.5% (2.26-2.46 GHz), and 3.0% (3.90-4.02 GHz). Compared with the recently reported metamaterial antennas, the proposed antenna achieves a smaller size, wider CP bandwidth, and higher gain. V C 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:964-969, 2016; View this article online at wileyonlinelibrary.com.

A Tri-mode Hybrid Antenna for Quad-band Applications

“…Narrow bandwidth restricts the ability of ZOR antennas to satisfy the communication needs of modern multifunctional smart devices. To achieve a wider bandwidth, two methods have been adopted in recent literature [10][11][12][13][14][15][16][17][18][19]. The first method is to lower the Q-factor of the ZOR by changing the distributed element values [10][11][12][13][14][15].…”

“…The first method is to lower the Q-factor of the ZOR by changing the distributed element values [10][11][12][13][14][15]. The second method is to excite another working mode of the ZOR antenna, such as the first negative order resonance (FNOR) mode, the first positive order resonance (FPOR) mode, and then combine them to yield a wider bandwidth [16][17][18][19]. Although these methods have widened the bandwidth of ZOR antenna to some degree, the improvement is relatively limited.…”

A triple‐band dual‐polarized CRLH antenna for wireless applications

“…5 Shunt lumped components are responsible for the latter case. 6 A number of linearly polarized (LP) multiband MTM antennas are reported in different literatures [7][8][9][10][11] for wireless applications. The linear polarization property forces strict orientation of these antennas to avoid polarization mismatch losses.…”

A novel ACPW-fed quad-band hybrid antenna for wireless applications

“…In [14], a coplanar waveguide (CPW)-fed metamaterial-inspired ZOR antenna which offers miniaturization and bandwidth enhancement properties by loading electromagnetic band gap structures is presented. In [15], a compact dual-band and circularly polarized antenna is proposed by simultaneously exciting ZOR and first-order resonance (FOR) for bandwidth enhancement. A low-profile antenna which provides a fractional bandwidth of 166% by increasing the number of CRLH unit cells is studied in [16].…”