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Radiation patterns of proposed antennas: (a) Antenna-1 and (b) antenna-2 at 3 GHz, 5 GHz and 7 GHz respectively. (solid line: co-polar, dashed line: cross-polar component).
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In this paper, two novel coplanar waveguide (CPW) fed printed ultra wide band (UWB) monopole antennas with dual band-notching characteristics are proposed. The modified ground technique with symmetric ground plane in antenna 1 and asymmetric ground planes in antenna-2 is exploited to cover UWB application. Both antennas are compact with dimensions...
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Citations
... The UWB antenna with band-notched properties is a better solution to avoid these electromagnetic interferences, without affecting the size and complexity of the system. Recently, good number of techniques were proposed in literature to achieve band notch characteristics such as adding parasitic strips to the patch [4], Complementary Split-Ring Resonator (CSRR) [5,21], Split-Ring Resonators (SRR) [6,22], λ/4 length stubs [7], meander line structures [8] and slots [9,16]. Among all these techniques, the most prevailing and simple technique is integrating a narrow slot into the radiator. ...
In this work, an elliptical planar monopole Penta band-notched ultra-wideband (UWB) antenna is proposed. Band rejection at 2.4-2.6 GHz IEEE 802.11 b/g/n, 3.3-3.75 Wi-MAX, 3.9-4.2 GHz C-band satellite communication, 5.15-5.85 WLAN, 7.9-8.4 GHz X-band satellite communication frequencies are achieved by etching slots in the radiating patch, feed line and ground plane. The effect of the slot length on the notched band is also studied. The proposed antenna has been fabricated and tested. The Measured impedance bandwidth of the antenna is 2.15-12.5 GHz, which covers bands of Bluetooth and UWB applications. The Peak gain of the proposed antenna is 8 dB and dropped drastically at notched bands. The proposed antenna shows good omnidirectional radiation patterns in the passbands.
... Because of the high-notch frequency requires a small slot length, the slot is designed as a close-end notch to reach the centre band rejection that equals half of the guided wavelength (λg/2). The total slot length is calculated by using (2) to achieve the required rejection frequency as [14]: ...
Notches loaded on a patch antenna can affect significantly on the antenna impedance matching. Therefore, notching technique is an efficient way to reduce the electromagnetic interference with unwanted bands. In this paper, a novel inverted diamond-shaped closed-end slot on a substrate and vertex-fed printed hexagonal patch ultra-wideband antenna is proposed for high-frequency band rejection. This antenna is fed using coplanar waveguide, and it is optimised by changing several patch parameters which further improved the entire bandwidth at both the lower and upper bands. However, the centre-notched band is shifted from 6 GHz to 7.5 GHz by cutting the inverted diamond shape in a special process. The developed ultra-wideband antenna is verified by comparing the simulation results with the measurement results. The measurement results with a fractional bandwidth of 133% have a good agreement with the simulation fractional bandwidth of 146%. The measured radiation showed omnidirectional patterns.
... Dual notch UWB antennas with pair of L-shaped stub or inverted C/U-shaped stub also provides dual notched band characteristics. A semicircular patch also results in UWB antenna [17][18][19][20][21]. Simple square patch with a pair of C-T shaped slots and Forkshaped slit for UWB applications with dual notch characteristics is reported. ...
In this article a microstrip-fed mickey shaped monopole antenna with triple notched band characteristics for ultra-wideband applications is presented. By etching two slots in the ground plane, improved VSWR bandwidth is achieved. Mickey shape radiating patch provides 10 dB return-loss bandwidth from 3.10 to 10.60 GHz. By etching three simple C-shaped slots on the radiating patch, three existing wireless communication systems which interfere with UWB band is removed which includes WiMAX IEEE802.16 (3.30–3.80 GHz), WLAN IEEE802.11a/h/j/n (5.15–5.35, 5.25–5.35, 5.47–5.725, 5.725–5.825 GHz) and X-band downlink satellite system (7.1–7.9 GHz). Experimental results reveal that the proposed antenna exhibits desirable radiation patterns in the far field, resulting omnidirectional like pattern in the H-plane and nearly dipole like pattern in the E-plane.
... The advantages of a printed UWB patch antenna are attributed to its low profile, easy fabrication, lightweight, low cost, and omnidirectional radiation patterns [2,3]. Furthermore, a UWB patch antenna can be connected to a port connector by using different fed line techniques such as microstrip-fed line [4], transformer microstrip-fed line [5], and CPW [6]. These techniques are employed with a finite ground plane to achieve UWB bandwidth. ...
... where F notch is the notch frequency and c the speed of light. The shortest path of the meander-line L ms is calculated by applying Equation (5), and the effective dielectric constant (ε reff ) is calculated by using Equation (4) [6]. ...
... The couple of F-slots acts as a quarter guided wavelength band-stop filter. The centre notched band is obtained by using Equation (6) [6]. Moreover, the total length of the couple of F-slots (Lfs) is calculated and optimised by using Equation (7) [4]. ...
A quad band-notched on compact ultra-wideband (UWB) patch antenna to operate on the industry, scientific, and medical (ISM) band is presented in this study. A modified hexagonal patch vertex-fed with a coplanar waveguide (CPW) is fabricated on an FR-4 substrate size of 43 × 28 × 1.6 mm3 with a fractional bandwidth of 133 %. The compact antenna operates at a frequency of 2.45 GHz, which is often required for the efficient performance for ISM utilisation. The existing bands share the same bandwidth as of UWB systems. Therefore, a notched band at 3 GHz for worldwide interoperability for microwave access (WiMAX), and a further resonance band at 2.45 GHz for ISM are generated by implementing a meander-line strip on the antenna. Furthermore, the design demonstrates a couple of F-shaped slots and an inverted diamond-shaped slot on the patch. Moreover, a pair of J-shaped slots is loaded on the ground plane. The downlink C-band, wireless local area network (WLAN), and downlink X-band are rejected by the proposed slots, respectively. The current distribution, gain, radiation efficiency, and quad notched parameters of the proposed antenna are studied by using CST software. The demonstrated prototype covers an ISM band at (2.2 GHz - 2.6 GHz) with a return loss of -23.45 dB and omnidirectional radiation patterns. The measured results observed are demonstrated to be in good agreement with the simulated results. This paper has clarified a solution for both interference and miniaturised issues.
... Ever since the Federal Communications Commission (FCC) released 3.1 to 10.6 GHz as an unlicensed band for radio communication, Ultra wideband (UWB) communication has drawn wide interest from the researchers for increasing the data rate in wireless communication. Due to many attractive features, such as simple structure, light weight, and low cost, printed antennas are the most frequently used antennas for UWB applications [1][2][3][4]. However, the planar monopole antennas for UWB communication system are still facing many challenges. ...
... Many techniques include providing a wide impedance bandwidth with notched function by cutting a pair of notches at the two lower corners of the square planar monopole [4], by having U slot [5], making slot on the tuning stub [6], with the combination of L and U slots [7], by having U slot and beveled patch [8], C-shaped slot on the ground plane [9] by combination of L and J slots [10] and by using partial ground plane [11]. ...
A compact printed monopole ultra-wideband (UWB) antenna with single band-notched characteristics of size 18mm× 12mm on FR4 substrate is proposed. The proposed antenna consists of a pair of slits and two U slots with a key shaped slot combined with one of the U slot. This provides a wide band width from 4.4 to 11.7 GHz with single band frequency notch from 5.2 to 5.8 GHz to avoid interference of UWB band with the existing systems. In this paper variation of frequency notched characteristics are discussed by combining the key shaped slot with U slots. The design parameters and the performance of the proposed antenna are analyzed by using HFSS. The antenna displays a good omnidirectional radiation pattern since it has square radiating patch. The measured and simulated results are in good agreement.
... Hence the key issue is design of a compact antenna with good wideband characteristics over the whole operating frequency band with a notched frequency operation from 5.15 to 5.85 GHz to avoid interference with the existing systems. Many techniques include providing a wide impedance bandwidth with notched function by cutting a pair of notches at the two lower corners of the square planar monopole [4], by having U slot [5], making a small strip bar [6], with the combination of L and U slots [7], by using Wshaped slot [8], by combination of L and J slots [9] and by using partial ground plane [10]. ...
A printed monopole ultra-wideband (UWB) antenna of size 18mm × 12mm from FR4 substrate with single band-notched characteristics is proposed in this paper. The proposed antenna consists of a patch with the stepped corners to increase the band width and an extended stepped side inverted U slot to provide frequency notched function. This antenna has an operating frequency from 4.4 to 11.2 GHz with a return loss less than -10dB and a single band frequency notch from 5.13 to 5.85 GHz to avoid interference of UWB band with the existing systems. In this paper, the variations of frequency notched characteristics are discussed by varying the thickness of the slot. The design parameters and the performance of the proposed antenna are analyzed by using HFSS. Experimental and simulated results are in good agreement and the antenna displays a good omnidirectional radiation pattern.
The ultra-wideband (UWB) antenna is developed to cover a broad bandwidth. The UWB radio systems are interfered by the same spectrum that shared with the local bands. In this paper, two F-shaped slots on a hexagonal patch UWB antenna are demonstrated to realize a high band rejection. The symmetrical couple F-slots is notched on the hexagonal UWB patch antenna to avoid the interference and enhance the notching results at C-band. The demonstrated antenna employs a coplanar waveguide (CPW) technique to meet a fractional bandwidth of 126%. The proposed method validates several reconfigurations of the F-slot location on the demonstrated design. Six steps parametric study are considered to test the slots location. The results of the proposed antenna with slots are introduced based on analytical, simulation, and measurement. The total design size 28 mm × 43 mm × 1.6 mm is simulated by using CST Microwave Studio. The two F-slots are achieved the antenna gain of -6 dB, return loss of -1.2 dB, and VSWR of 15.2 at the rejected band of 4 GHz. The measurement results are compared with the simulation results between the three prototypes. The current distribution on the design is discussed at 2.88 GHz and 4 GHz frequencies. The radiation patterns illustrate omnidirectional of H-plane and bidirectional of E-plane. This paper validates the slots locations to enhance the notches performance and reduce the interference.
