In this study, we constructed a 4-element linear array antenna using four 20 GHz band microstrip patch antennas with a structure such that the signal is fed to the patch antennas from open-end coplanar waveguides with...In this study, we constructed a 4-element linear array antenna using four 20 GHz band microstrip patch antennas with a structure such that the signal is fed to the patch antennas from open-end coplanar waveguides without contact. We investigated factors related to the design of linear array patch antennas. To adjust the maximum radiation direction and reduce return loss, we optimized the spacing between the elements and their shape. With an element spacing of 11.50 mm, patch width of 3.90 mm, and patch length of 4.15 mm, we obtained a resonance frequency of 20.05 GHz and a return loss of -29.59 dB at the resonance frequency. However, in the case of a 4-element linear array antenna structure, undesired resonances occurred in frequency bands other than the design resonance frequency band of 20 GHz. To suppress these undesired resonances and obtaining stable operation at the design frequency, we propose a new structure in which the feed line is loaded with a short stub, and show through computer simulations that the occurrence of undesired resonances can be sufficiently suppressed. Furthermore, we demonstrate the problem of radiation gain reduction caused by introducing a short stub, propose a design method for a new structure in which the feed line has slits between the stubs, and show improvement of the antenna gain by 0.5 dBi.展开更多
In this paper, an electromagnetic metamaterial patch antenna is designed and simulated for cognitive radio applications, as cognitive radio communication is anticipated to be a new technology which utilizes all the ba...In this paper, an electromagnetic metamaterial patch antenna is designed and simulated for cognitive radio applications, as cognitive radio communication is anticipated to be a new technology which utilizes all the bands of radio spectrum. This work uses a complementary split ring resonator between the patch and the ground plane for the purpose of size miniaturization. The proposed antenna system is capable of operating in the frequency range of about 2 to 5 GHz. This wide-band design makes it viable for wide spectrum with 80 percentage effective frequency being covered in the designed band. The desired patch antenna has been simulated using Advanced System Design (ADS) simulator. The simulated results are proved to be good in agreement with cognitive radio application.展开更多
提出了一种通过八边形互补开口谐振环结构(Complementary Split Ring Resonator,CSRR)抑制微带天线阵相互耦合的方法。新结构加载于间距为1/4波长的两个微带天线组成的阵列中,蚀刻在阵列的接地板上。在谐振频率附近会出现带阻效应,抑制...提出了一种通过八边形互补开口谐振环结构(Complementary Split Ring Resonator,CSRR)抑制微带天线阵相互耦合的方法。新结构加载于间距为1/4波长的两个微带天线组成的阵列中,蚀刻在阵列的接地板上。在谐振频率附近会出现带阻效应,抑制天线阵间的互耦,仿真结果证明天线阵列间的互耦因子降低34.6dB,且抑制范围也较宽。展开更多
文摘In this study, we constructed a 4-element linear array antenna using four 20 GHz band microstrip patch antennas with a structure such that the signal is fed to the patch antennas from open-end coplanar waveguides without contact. We investigated factors related to the design of linear array patch antennas. To adjust the maximum radiation direction and reduce return loss, we optimized the spacing between the elements and their shape. With an element spacing of 11.50 mm, patch width of 3.90 mm, and patch length of 4.15 mm, we obtained a resonance frequency of 20.05 GHz and a return loss of -29.59 dB at the resonance frequency. However, in the case of a 4-element linear array antenna structure, undesired resonances occurred in frequency bands other than the design resonance frequency band of 20 GHz. To suppress these undesired resonances and obtaining stable operation at the design frequency, we propose a new structure in which the feed line is loaded with a short stub, and show through computer simulations that the occurrence of undesired resonances can be sufficiently suppressed. Furthermore, we demonstrate the problem of radiation gain reduction caused by introducing a short stub, propose a design method for a new structure in which the feed line has slits between the stubs, and show improvement of the antenna gain by 0.5 dBi.
文摘In this paper, an electromagnetic metamaterial patch antenna is designed and simulated for cognitive radio applications, as cognitive radio communication is anticipated to be a new technology which utilizes all the bands of radio spectrum. This work uses a complementary split ring resonator between the patch and the ground plane for the purpose of size miniaturization. The proposed antenna system is capable of operating in the frequency range of about 2 to 5 GHz. This wide-band design makes it viable for wide spectrum with 80 percentage effective frequency being covered in the designed band. The desired patch antenna has been simulated using Advanced System Design (ADS) simulator. The simulated results are proved to be good in agreement with cognitive radio application.
文摘提出了一种通过八边形互补开口谐振环结构(Complementary Split Ring Resonator,CSRR)抑制微带天线阵相互耦合的方法。新结构加载于间距为1/4波长的两个微带天线组成的阵列中,蚀刻在阵列的接地板上。在谐振频率附近会出现带阻效应,抑制天线阵间的互耦,仿真结果证明天线阵列间的互耦因子降低34.6dB,且抑制范围也较宽。
