Bandwidth enhancement and miniaturization of circular-shaped microstrip antenna based on beleved half-cut structure for MIMO 2x2 application

Abstract

<span lang="EN-US">In this paper, circular-shaped microstrip antenna was simulated, fabricated, and measured accordingly. As the novelty, to enhance bandwidth and reduce antenna size, beleved half-cut microstrip structure is proposed. Further, this proposed antenna structure will be applied to multiple input multiple output (MIMO) antenna 2</span><span lang="EN-US">´</span><span lang="EN-US">2. Therefore, this research was investigated conventional circular shape antenna (CCSA), circular shaped beleved antenna (CSBA), and MIMO circular shaped beleved antenna (MIMO-CBSA) as Model 1, Model 2, and Model 3, respectively. An FR4 substrate with er= 4.4, thickness h=1.6 mm, and tan d=0.0265 was used. The simulation has been conducted using Advanced Design System (ADS). The antenna CCSA/CSBA/ MIMO-CBSA achieve 1.831GHz/2.265 GHz/2.256 GHz, -15.13dB/-17.37dB/-17.25 dB, 1.42/1.31/1.33, and 1.474/2.332/2.322 for center frequency, reflection coefficient, VSWR, and bandwidth, respectively. This antenna has a size 63x90 mm and 51.5x90 mm for CCSA (Model 1) and CSBA (Model 2), respectively. After the structure of MIMO 2</span><span lang="EN-US">´</span><span lang="EN-US">2 was applied, the size of antenna MIMO-CBSA (Model 3) became 180 mm x 180 mm with a mutual coupling (S<sub>21</sub>)=-26.18 dB and mutual coupling (S<sub>31</sub>)=-26.41 dB. The result showed that proposed antenna CSBA (Model 2) has wider-bandwidth of 58,2% and smaller-size of 18.2%. Furthermore, after CSBA (Model 2) structure was applied to MIMO 2</span><span lang="EN-US">´</span><span lang="EN-US">2 (Model 3) and the MIMO antenna obtain good mutual coupling (<-15dB). Moreover, the measured results are good agreement with the simulated results. In conclusion, all of these advantages make it particularly valuable in multistandard antenna applications design such as GSM950, WCDMA1800, LTE2300, and WLAN2400.</span>

Aperture coupling rectangular slotted circular ring microstrip patch antenna

“…To simplify the process of designing the antenna, should be determined the systematic measures in the form of a flowchart described in Figure 1. The patch that is used in this paper is circular ring showed in Figure 2 which is a development of circular patch that is known to be good for enhancing the bandwidth [13] and multi-resonating frequencies application [14], where the radius dimension of radiating element can be calculated by the [15]. To bring an enhancement for the antenna, there will be using one of the popular method in modifying the coupling level of antenna by applying aperture coupled feeding technique.…”

A rectangular CSRR based microstrip UHF reader patch antenna for RFID applications

“…The structure of the CSRR is shown in Figure 2. We have adopted the analytical equation for CSRR resonant frequency accomplished which is addressed in [16][17][18][19][20][21][22][23][24]. By using the (1-3), the average ring length (A), outer length (a1), and inner length (a2) of CSRR structure are correspondingly measured as follows: The dimension of the ring split (s) and width (w) was set to 0.2 mm.…”

Design of Antenna Array for Ku-Band Wireless Application

“…The gap coupled array had wide band, high directivity and low mutual coupling [19]. On the other hand, to reduce the antenna size and increase the bandwidth a beveled circular patch in the form of 2X2 array was suggested for MIMO system [20]. In [21], a 3X3 array was designed by gap coupling the half E shaped patches with proximity fed rectangular patches to achieve high gain and broad radiation pattern.…”