Isolated Gain Enhancement for Dual-Band C-Metaloop Antennas Using a Coplanar Compound Method
Isolated Gain Enhancement for Dual-Band C-Metaloop Antennas Using a Coplanar Compound Method
复制标题
使用共面复合方法增强双频段 C-Metaloop 天线的隔离增益
DOI：
10.1109/tap.2023.3267174
复制
发表时间：
2023
影响因子：
5.7
通讯作者：
J. Yamauchi
中科院分区：
文献类型：
--
作者：
H. Nakano;T. Abe;A. Mehta;J. Yamauchi
When the circumference of a round metaloop antenna (RoMLA), made of C- type meta-atoms, is one guided wavelength (<inline-formula> <tex-math notation="LaTeX">$1\lambda _{\mathrm {g}}$ </tex-math></inline-formula>) of the current on the loop, the RoMLA radiates a left-hand circularly polarized (LHCP) wave at frequency <inline-formula> <tex-math notation="LaTeX">$\text{f}_{\mathrm {N}}$ </tex-math></inline-formula> and a right-hand circularly polarized (RHCP) wave at frequency <inline-formula> <tex-math notation="LaTeX">$\text{f}_{\mathrm {H}}$ </tex-math></inline-formula> in the direction normal to the antenna plane. These CP waves have different maximum gains. This article discusses enhancement in the small gain, not affecting the inherent large gain. Such uncorrelated enhancement in the gain, named isolated gain enhancement (IsoGE), differs from conventional correlated gain enhancement (non-IsoGE). For IsoGE, a parasitic ring is inserted into the open space of the RoMLA while maintaining the low-profile RoMLA structure on the order of <inline-formula> <tex-math notation="LaTeX">$\lambda _{0}$ </tex-math></inline-formula>/100 with <inline-formula> <tex-math notation="LaTeX">$\lambda _{0}$ </tex-math></inline-formula> being the free-space operating wavelength. It is found that the ring finally transformed into a round patch is effective for the IsoGE, where the induced current on the patch contributes to increasing the small gain. The analysis, for the first time, shows that the axial ratio (AR) and VSWR are, respectively, less than 3 dB and 2 across the 3-dB gain bandwidths around <inline-formula> <tex-math notation="LaTeX">$\text{f}_{\mathrm {N}}$ </tex-math></inline-formula> and <inline-formula> <tex-math notation="LaTeX">$\text{f}_{\mathrm {H}}$ </tex-math></inline-formula>, as desired. Furthermore, the insertion of a square parasitic patch within the open space of a square metaloop antenna is also found to be effective for the IsoGE.
When the circumference of a round metaloop antenna (RoMLA), made of C- type meta-atoms, is one guided wavelength (<inline-formula> <tex-math notation="LaTeX">$1\lambda _{\mathrm {g}}$ </tex-math></inline-formula>) of the current on the loop, the RoMLA radiates a left-hand circularly polarized (LHCP) wave at frequency <inline-formula> <tex-math notation="LaTeX">$\text{f}_{\mathrm {N}}$ </tex-math></inline-formula> and a right-hand circularly polarized (RHCP) wave at frequency <inline-formula> <tex-math notation="LaTeX">$\text{f}_{\mathrm {H}}$ </tex-math></inline-formula> in the direction normal to the antenna plane. These CP waves have different maximum gains. This article discusses enhancement in the small gain, not affecting the inherent large gain. Such uncorrelated enhancement in the gain, named isolated gain enhancement (IsoGE), differs from conventional correlated gain enhancement (non-IsoGE). For IsoGE, a parasitic ring is inserted into the open space of the RoMLA while maintaining the low-profile RoMLA structure on the order of <inline-formula> <tex-math notation="LaTeX">$\lambda _{0}$ </tex-math></inline-formula>/100 with <inline-formula> <tex-math notation="LaTeX">$\lambda _{0}$ </tex-math></inline-formula> being the free-space operating wavelength. It is found that the ring finally transformed into a round patch is effective for the IsoGE, where the induced current on the patch contributes to increasing the small gain. The analysis, for the first time, shows that the axial ratio (AR) and VSWR are, respectively, less than 3 dB and 2 across the 3-dB gain bandwidths around <inline-formula> <tex-math notation="LaTeX">$\text{f}_{\mathrm {N}}$ </tex-math></inline-formula> and <inline-formula> <tex-math notation="LaTeX">$\text{f}_{\mathrm {H}}$ </tex-math></inline-formula>, as desired. Furthermore, the insertion of a square parasitic patch within the open space of a square metaloop antenna is also found to be effective for the IsoGE.
影响因子：
1.6
作者：
H. Nakano;Ittoku Yoshino;T. Abe;J. Yamauchi
通讯作者：
H. Nakano;Ittoku Yoshino;T. Abe;J. Yamauchi