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In this article, a compact uniplanar asymmetric coplanar strip (ACS)‐fed multiband antenna with extended rectangular strips is proposed for portable system applications. It is composed of a modified mouse and rectangular‐shaped radiating strip for generating three resonance frequency bands simultaneously. The proposed antenna has a compact size of...
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Citations
... The antenna offers limited bandwidth at the lower resonance while the radiation pattern is also distorted at all resonating frequencies. A conventional broadband monopole is converted into a triband antenna using a uniplanar asymmetric coplanar strip (ACS) feeding technique along with a modified F-shaped structure [17]. ...
This article describes the design of a tri-band antenna that operates at 2.45 GHz (ISM band), 3.5 GHz (5G sub-6-GHz band), and 5.8 GHz (WLAN band). The antenna design is inspired by a conventional quarter-wave monopole which is fed using a coplanar waveguide feed. Initially, the radiator is loaded with an inverted L-shaped stub to attain broadband across the band spectrum of 2.4 GHz. Then, a pair of two open-ended stubs are etched to achieve a higher frequency band of 5.8 GHz. Hereafter, another open-ended stub is loaded to the right end of the radiating structure, which results in the generation of the Sub-6 GHz 5G (3.5 GHz) band. Finally, the antenna is optimized using parametric analysis to improve the impedance matching across all bands. The proposed antenna offers a tri-band operational mode having frequency ranges from 2.38-2.51 GHz, 3.44-3.84 GHz, and 5.53-7.23 GHz. The reported gains of the proposed antenna at respective frequencies are 2 dBi, 2.1 dBi, and 2.5 dBi having an omnidirectional stable radiation pattern. The antenna prototype is created on a small 20 × 16 × 1.6 mm3 board, and measured to validate the results. Furthermore, the performance of the antenna is compared with the state-of-the-art works to demonstrate its key advantages over similar designs.
... This results in overall size reduction of the antenna. From literature, it is seen that an ACS-fed antenna retains all the characteristics of a CPW-fed antenna but within a lesser area [24][25][26][27][28][29]. Studies have reported various dual band antennas employing ACS feed [30][31][32][33]. ...
A novel design approach for a compact, uniplanar metamaterial (MTM) inspired antenna with dual band operation is presented. The design consists of a partial ground plane, an Asymmetric Coplanar Strip (ACS) feed, and a radiating element comprising of an outer circular Closed Ring Resonator (CRR) coupled to an inner metamaterial inspired Non-Bianisotropic Split Ring Resonator (NB-SRR). The antenna can provide dual band operation from 2.84–3.78 GHz and 4.7–5.07 GHz, with reflection coefficients better than −10 dB due to the resonant modes of CRR and NB-SRR, respectively. The antenna is fed using an ACS which effectively reduces the antenna size. The design incorporates a meander line transformer between the ACS and the radiating elements for achieving better impedance matching which further aids in miniaturization of the antenna. The proposed antenna confines to a size of 11.75 mm × 24 mm × 1.6 mm which complements to the present day’s requirement of miniaturization of electronic components. A detailed elaboration on the various phases of evolution of the proposed antenna and its parametric study is done. The MTM characteristics of NB-SRR is studied. A prototype of the proposed antenna is fabricated and tested. The measured results are in fair equivalence with the simulated results. The antenna provides an average gain of 2.8dBi, adequate radiation properties and good level of compactness and is suitable for S-band (2–4 GHz) and C-band (4–8 GHz) applications.
... The antenna operates in different resonant frequencies [10][11][12][13] using a radiating strip structure. The radiating strip length considered in the literary works is between monopole and dipole design length. ...
—In this paper, a low-profile flexible antenna using a flexible substrate is presented. The proposed antenna has concentric circle-shaped radiating elements with circular slots to achieve an ISM band. The flexible antenna having dimensions (33 mm × 18 mm × 2 mm) is designed and fabricated on a silicon rubber-based substrate, and measurements were performed to validate the simulation results. The measured and simulated results demonstrate that the antenna radiates at 2.45 GHz center frequency, with a return loss of −23.23. The operating frequency of 2.45 GHz, flexible substrate, and low SAR of 0.0658 W/kg confirm that the proposed antenna is suitable for medical telemetry applications.
... MTM structures are employed in MTM inspired antennas, filters, sensors, and absorbers for performance enhancement and miniaturization [7][8][9]. Further miniaturization is made possible by making use of ACS feed which reduces the antenna size to almost half of that of coplanar waveguide designs [10]. Many multiband antennas with ACS feed can be seen in literature [11][12][13]. ...
... Many tri-band antennas operating in major frequency bands have been used to satisfy bandwidth requirements, and ensure stable gain, high radiation efficiency, and omnidirectional radiation reception [21][22][23][24][25][26][27][28][29][30]. A compact tri-band antenna with multiple metallic strips in a dual F-shaped monopole was presented in [21]. ...
... A uniplanar, ACS-fed tri-band antenna with extended rectangular strips was designed for portable system applications [23]. The antenna has a modified mouse and rectangular radiating strips; three different bands can operate simultaneously. ...
... The performance of our antenna, in terms of size, operating bands, and average gain, is compared to those of state-of-the-art tri-band antennas [21][22][23][24][25][26][27][28][29][30] in Tab. 1. Our antenna outperforms the others in terms of size, gain, and radiation stability. ...
We designed and constructed a novel, compact tri-band monopole antenna for intelligent devices. Multiband behavior was achieved by placing inverted-L shaped stubs of various lengths in a triangular monopole antenna fed by a coplanar waveguide. The resonance frequency of each band can be controlled by varying the length of the corresponding stub. Three bands, at 2.4 (2.37-2.51), 3.5 (3.34-3.71), and 5.5 (4.6-6.4) GHz, were easily obtained using three stubs of different lengths. For miniaturization, a portion of the longest stub (at 2.4 GHz) was printed on the opposite side of the substrate, and connected to the main stub via a shorting pin. To validate the concept, the antenna was fabricated on a low-cost 1.6-mm-thick FR-4 substrate with dimensions of 20 × 15 × 1.6 mm3. The antenna exhibited a moderate average gain of 2.9 dBi with an omnidirectional radiations over the bandwidths required for RFID, Bluetooth, ISM, WiMAX, and WLAN-band applications. These features make the antenna suitable for compact smart devices.
... 29,30 Various compact ACS-fed antenna designs are discussed for multiband applications using different approaches such as adding radiating elements/branches. [31][32][33] Four E-shaped meander line structures are added to the C-shaped monopole antenna; it covers 4G LTE and 5G applications. 34 In Mansour et al., 35 a semi-rectangular loop with a slot is proposed for dual-band operation at 1.9 and 2.45 GHz. ...
In this paper, an electrically small inverted L‐shaped asymmetric coplanar strip‐fed antenna with a split‐ring resonator structure is proposed for multiband applications. It possesses an extended monopole antenna and a rectangular split‐ring resonator (RSRR) structure. A monopole is responsible for generating the first and last resonance frequencies. Similarly, the RSRR structure produces center frequency (5.5 GHz) among three resonance frequency bands and improves impedance matching at a higher frequency. The antenna has an electrical size of 0.176 λ0 × 0.096 λ0 × 0.012 λ0. The proposed antenna has a triband resonance response at 2.45, 5.5, and 7.5 GHz with a bandwidth of 560 MHz, 680 MHz, and 3 GHz, respectively, which covers WiBro (2.3 GHz), WLAN (2.4/5.2 GHz), WiMAX (2.5/5.5 GHz), X‐band downlink (7.4 GHz), and ITU band (8.5 GHz). The antenna design is simulated and validated with measured results and has better radiation characteristics in all the required frequency bands. The presence of metamaterial property in the proposed RSRR is analyzed. The design is an electrically small antenna, and it has a radian sphere (ka) = 0.64. Further, the proposed antenna performances are compared with the various existing literature. In this paper, an electrically small inverted L‐shaped asymmetric coplanar strip‐fed antenna with a split‐ring resonator structure is proposed for multiband applications. The antenna has an electrical size of 0.176 λ0 × 0.096 λ0 × 0.012 λ0. The proposed antenna has a triband resonance response at 2.45, 5.5, and 7.5 GHz with a bandwidth of 560 MHz, 680 MHz, and 3 GHz, respectively. The design has a radian sphere (ka) = 0.64.
... The slotted ground surface with the planner-printed microstrippatch antenna for the multiband application is presented in [9], but it is not applicable for WLAN. An extended rectangular radiating strip is added with an ACS-fed antenna structure to produce the multiband performance [10]. Two open L-shaped slotted antenna for the multiband wireless application with a dimension of 120 mm × 60 mm is discussed in [11]. ...
In this article, a modified Minkowski fractal antenna with a circular-shaped split-ring resonator (CSSRR) structure is proposed for wireless applications. Fractal geometry is accountable for creating dual-band resonance, and CSSRR is responsible for obtaining a middle resonance frequency band. The proposed antenna has a compact dimension of 23.5 × 26.5 × 1.6 mm³ to be fabricated and measured. Antenna iterations performed to achieve the desired frequency band. Antenna design has three resonance frequency bands at 2-2.7 GHz (700 MHz), 3.4-3.6 GHz (200 MHz) and 5.45-5.95 GHz (500 MHz), respectively. It can be used to cover 2.4/5 GHz wireless local area network (WLAN), 2.5/3.5 GHz wireless interoperability for microwave access (WiMAX), 2.1/2.3 GHz 3 generation (3G)/4 generation (4G) and 5.9 GHz safety applications. It is observed that the proposed antenna has good radiation characteristics in both E-plane and H-plane in the desired frequencies. Further, it has better antenna parameters than the various antenna designs reported in the literature.
... The Asymmetric Coplanar Strip (ACS) fed antennas has recently gained tremendous popularity to the antenna design engineers due to their size reduction techniques along with its wide impedance bandwidth, desired radiation properties (gain and effeciency) and simple structures [11][12][13]. ACS method provides a compact and uniplanar antenna since it has a single ground plane compared to other techniques [14,15]. In order to decrease the overall size of the patch antenna, designs are proposed using the concept of asymmetric coplanar strip fed technique [16][17][18]. ...
In the proposed paper, a uniplanar asymmetric coplanar strip (ACS) fed antenna with closed V-shaped radiating patch of size printed on FR4 substrate with loss tangent ( =0.02, height (h)=1.6mm, and dielectric constant of 4.4 covering WiMAX, X-band and WLAN applications is presented. The proposed closed V-shaped radiating patch is formed by joning two rectangular stubs. The resultant shape of the radiating patch is obtained by adding rectangular strips to feed line until desired multiband results are achieved. The advantage of this structure is that it forms simple configuration as well as helps the overall antenna in attaining three distinict useful frequency band with good impedance matching for S11-10 dB criteria. The proposed ACS fed antenna operates at 3.1 (WiMAX), 5.0 (WLAN) and 9.9 (X-band) GHz with impedance bandwidth ranging from 2.7-3.9 GHz, 4.4-5.5 GHz and 9.5-10.3 GHz in simulation. Under measurement the proposed antenna shows multiband phenomenon at 3.2, 5.3 and 9.7 GHz with impedance bandwidth ranging from 2.8-3.7 GHz, 4.6-5.4 GHz and 9.4-10 GHz, respectively. The antenna exhibits simulated gain of 2.51, 1.18 and 1.96 dB at the corresponding frequency bands of 3.1, 5.0 and 9.9 GHz. The key parameters of the antenna like length and width of the multi-branched strips are optimized to get the multiband operation. The deisign simulation is carried out in Ansys HFSS (High frequency Simulation Software) where different characteristics of the proposed antenna are investigated. The evolution and optimization process is dealt in detail with the help of S11, VSWR, current distributions, radiation patterns and gain.
... To integrate the antenna with the radio frequency circuitry, uniplanar antenna design is well suitable (i.e., having the radiating patch and ground plane in a single layer) [1]. To feed the uniplanar design antenna either the CPW feed or ACS-feeding technique is used [3][4][5][6][7][8]. ...
... Different structures, such as L-shape, inverted L-shape, Fshape, mouse-shape, meander line, circular slot, U-shape slot, etcetera, are considered in the radiating patch and ground plane to achieve multiband functionalities in an antenna [4][5][6]. The radiating strip has been proposed in [7]. Anil Kumar et al. [8] reported an F-shaped radiating patch that allows the antenna to operate in three bands such as digital cellular system (DCS), Wi-Fi and WiMax applications. ...
Presently, a single compact antenna is expected to operate in multiple frequency bands, so that it may be used for multiple applications. In this regard, a compact asymmetric coplanar strip (ACS) fed monopole antenna was designed to operate in LTE band-40 and 5G mid band frequencies. To achieve the desired dual band frequency, meander line radiating structure was used. The uniplanar design with the ACS feed considerably reduced the antenna size to 19.25 × 10.5 × 1.6 mm3. This miniaturized dual band antenna can be easily integrated into circuit boards. The measured and simulated results provided a reflection coefficient (S<sub>11</sub>) < –15 dB, which made the antenna suitable for LTE band-40 and 5G mid-band communication applications.
A shorting pin-based, compact two-port MIMO, modified monopole antenna with high isolation, circular polarization (CP) and pattern diversity is presented for 5G wireless applications. The antenna shows −10 dB impedance bandwidth of 550 MHz (0.95 GHz–1.50 GHz), 320 MHz (3.35 GHz–3.67 GHz), and 410 MHz (5.01 GHz–5.42 GHz) with excellent isolation of over −20 dB within all three operating bands. The antenna is circularly polarized and provides an axial ratio bandwidth (ARBW) of 100 MHz, 300 MHz, and 150 MHz centered at 1.2 GHz, 3.5 GHz, and 5.2 GHz, respectively. To maintain the compact size at L-Band (along with two other bands) and high isolation, three modified monopoles are extended on the bottom layer of the antenna through shorting pins. An in-built isolator is integrated on its ground plane to suppress the mutual coupling between both ports of the proposed MIMO antenna. The antenna is fabricated on Rogers RO4350B substrate of an overall dimension of 34 × 38 × 1.52 mm3 (0.20λ0 × 0.22λ0 × 0.009λ0). The proposed antenna exhibits pattern diversity. The antenna's performance is also evaluated for MIMO system criteria by analyzing various diversity parameters. The proposed antenna is easy to fabricate and can be integrated with other MMIC components.
