Planar Monopole UWB Research Articles

Design of Compact Planar Monopole UWB MIMO Antenna with Four Orthogonal Elements and Tapered Fed Configuration for Wireless Diversity Applications

In this paper, we introduce a four-port self-isolated UWB MIMO antenna for diversity applications. First, we have developed a basic radiating element of the proposed antenna in four stages of design, where patches of geometrically different shapes were added at each stage to arrive at the final radiator form. The antenna was designed on an FR-4 substrate with a compact size of 28 × 28 × 1.6 mm3. A tapered microstrip feeding was employed to enhance the antenna’s impedance matching. An orthogonal arrangement of the four radiators was adopted to mitigate the mutual coupling between them, avoiding the use of a separate isolation structure. A prototype was built and measured with a close agreement between the experimental and simulated results. The MIMO antenna performed well in the entire frequency spectrum of 3.1–10.6 GHz, with an isolation better than 20 dB. The measured envelope correlation coefficient (ECC) was less than 0.001, the diversity gain (DG) was greater than 0.99 dB, and the total active reflection coefficient (TARC) was less than −10 dB. The performance of the proposed antenna design was compared with existing designs. The comparison showed that the proposed quad-element UWB MIMO array is compact, has good isolation and diversity performance compared to existing designs, and is well-suited for wireless diversity applications.

Ultra Wideband Planar Monopole Antenna with Pair of C-Shaped Slots and T-Shaped Sleeve for Microwave Systems

This paper introduces a compact UWB planar monopole antenna for microwave imaging systems. An antenna consists of square shaped radiating patch with a couple of C shaped slots for exciting resonance. By introducing T shaped sleeves on the ground plane, wide impedance bandwidth is achieved in range of (3.6 - 12 GHz). The proposed antenna has compressed size having dimensions Ls× Ws× Hs mm3. By embedding C-shaped slots with varying dimensions on radiating patch additional resonance are excited which results better wide impedance bandwidth. Simulated results such as return loss, gain, radiation pattern authenticate the convenient antenna structure for different microwave imaging system applications.

A Planar Monopole UWB Antenna with Partial Ground Plane for Retransmission-Based Chipless RFID

A Planar Monopole UWB Antenna with Partial Ground Plane for Retransmission-Based Chipless RFID

Reconfigurable band notch butterfly-wing shaped ultra-wide band antenna using varactor diodes

In this paper, a CPW fed UWB planar monopole Butterfly’s-wing shaped antenna with reconfigurable band notch characteristics is presented, tested and fabricated in the beginning three eelliptical patches are used to construct the antenna, then three elliptical slots have been created to improve the performance of the antenna. By using suitable varactor diodes in suitable positions in the slots a notch frequency can be obtained. The notch frequency of the antenna can be controlled by varying the varactor diodes’ capacitance that varied from 0.2 to 1.4 pf and frequency tunability can be achieved without modifying the basic antenna geometry. The proposed antenna is suitable for downlink band notching applications in C-band satellite (3.6–4.2 GHz). Finite element method FEM is used to simulate the proposed structures using HFSS. A prototype of the proposed antenna using three capacitor elements is fabricated and S11 is measured. Three 0.5 pf single capacitor element are used instead of the varactor diodes which are not available in the laboratory and the measured S11 is compared with the simulated results. Very good agreement has been obtained between them. The proposed antenna without and with capacitors yield directive patterns in the E-plane and omnidirectional patterns in H-plane. Also the gain is suppressed in the notch frequency.

A Dual Band Notched Ultra-Wideband Antenna

In this paper, we design a planar monopole UWB antenna among two notched. Two semi-elliptical geometries are introduced at the lower and upper side’s rectangular patch. For increasing the antenna’s impedance bandwidth, stepped ground plane is used. The interference because of Worldwide Interoperability for Microwave Access (WiMAX 3.3–3.8 GHz) and Wireless Local Area Network (WLAN 5–6 GHz) bands are eliminated by introducing half wavelength U-shaped slot in radiator and couple of quarter wavelength L-shaped slots in stepped floor plane, respectively. Results are obtained from the fabricated UWB antenna. The proposed antennas are established from Omni-directional radiation pattern.

High gain CPW‐fed UWB planar monopole antenna‐based compact uniplanar frequency selective surface for microwave imaging

High gain CPW‐fed UWB planar monopole antenna‐based compact uniplanar frequency selective surface for microwave imaging

A Novel UWB Antenna with Two Ultra Narrow and Closely Space Notched Bands

A novel compacting print planar monopole UWB antenna with two ultra narrow and closely space band-notched characteristics for low WLAN (5.15∼5.35GHz) and high WLAN (5.725∼5.825GHz) applications is presented. The antenna is one of the smallest UWB antenna found in the open literatures because of its overall size of 20×16 ×0.8(mm3). Especially, by employing two open-circuited stub pairs (OCSPs), dual-band-notched characteristics are achieved. The notched bands is ultra narrow of 0.26GHz and 0.18GHz, respectively, to suppress the interferences of lower and higher WLAN band just enough. And the space between two notched bands is 0.53GHz. These features make a good proof that OCSP could reject narrow bands in both antenna and BPF.

A New Planar Monopole UWB Antenna with Quad Notched Bands

A New Planar Monopole UWB Antenna with Quad Notched Bands

Miniaturized Planar Monopole UWB Antenna with Integrated RFID/GPS/GSM/WLAN Bands Using Capactively Loaded Loop Resonator (CLLRs)

Miniaturized Planar Monopole UWB Antenna with Integrated RFID/GPS/GSM/WLAN Bands Using Capactively Loaded Loop Resonator (CLLRs)

Key shaped planar UWB monopole antenna with dual band-notch characteristics

In this paper, dual vertical cross-elliptical radiating elements dual-notched ultra-wideband antenna (UWB) is proposed. The proposed antenna is compact in size (18 × 20 mm2 = 360 mm2) with combination of two ellipse and modified ground plane so as to cover UWB impedance bandwidth. There is a close agreement between the simulated and the measured results like return loss and VSWR of the proposed antenna where measured results also covers impedance UWB bandwidth from 2.84 GHz to 10.83 GHz which validates FCC standard UWB bandwidth from 3.1 GHz to 10.6 GHz. Moreover the two notched bands, i.e., WiMAX (3.30–3.80 GHz) along with C-band (3.80–4.20 GHz) and WLAN-IEEE 802.11a (5.15–5.825 GHz) band stopped so that the interference is eliminated. The proposed antenna is verified by measuring gain and radiation characteristics which exhibits nearly omni-directional pattern in the H-plane and monopole like pattern in E-plane of UWB bandwidth.

Key shaped planar UWB monopole antenna with dual band-notch characteristics

In this paper, dual vertical cross-elliptical radiating elements dual-notched ultra-wideband antenna (UWB) is proposed. The proposed antenna is compact in size (18 × 20 mm2 = 360 mm2) with combination of two ellipse and modified ground plane so as to cover UWB impedance bandwidth. There is a close agreement between the simulated and the measured results like return loss and VSWR of the proposed antenna where measured results also covers impedance UWB bandwidth from 2.84 GHz to 10.83 GHz which validates FCC standard UWB bandwidth from 3.1 GHz to 10.6 GHz. Moreover the two notched bands, i.e., WiMAX (3.30–3.80 GHz) along with C-band (3.80–4.20 GHz) and WLAN-IEEE 802.11a (5.15–5.825 GHz) band stopped so that the interference is eliminated. The proposed antenna is verified by measuring gain and radiation characteristics which exhibits nearly omni-directional pattern in the H-plane and monopole like pattern in E-plane of UWB bandwidth.

Investigation of a notched UWB antenna with opening and shorting resonators

AbstractIn this article, a planar ring monopole UWB antenna with two kinds of resonators are presented and investigated. The half wavelength opening resonator and quarter wavelength shorting resonator are coupled with the feed line capacitive to obtain notched characteristic. The contrast of current distribution demonstrates this novel method, and experimental results show that the proposed antennas meet the requirement of ultra‐wide bandwidth (3.1–10.6 GHz), while avoiding the interference from WLAN band. Some important models and parameters, such as the transmission line model, equivalent circuit model, VSWR, radiation pattern antenna gain, and transfer function are also studied to evaluate notched characteristics.

Compact planar UWB monopole antenna with dual band-notch characteristics

Compact planar UWB monopole antenna with dual band-notch characteristics

Compact planar UWB monopole antenna with dual band-notch characteristics

In this article, a compact Mickey shaped monopole UWB antenna is presented with dual notch band characteristics. The proposed antenna VSWR (<2) and return loss (<-10 dB) results have been verified by EM simulator and the measured impedance bandwidth covers from 2.88 GHz to 12.11 GHz which confirms the bandwidth. Furthermore, the two notched bands, i.e., WiMAX (3.3-3.7 GHz) along with C band (3.7-4.2 GHz) and WLAN (5.15-5.825 GHz) are band rejected so that the interference is mitigated in the existing wireless system. The proposed antenna is fabricated with compact dimensions of 20 × 20 mm² = 400 mm² on FR4 substrate with permitivity 4.4 and thickness of 1.6 mm. The measured gain and radiation characteristics of proposed antenna provide best results showing omni-directional pattern in H-plane and dipole like pattern in E-plane.

A planar UWB monopole antenna with dual band notched function

ABSTRACTA printed monopole antenna for UWB applications with dual band notch property is proposed in this letter. The UWB monopole consists of modified circular patch with an elliptical slot to reject WiMAX frequencies (3.3–3.8 GHz). The modified ground plane is introduced to attain the wide impedance UWB bandwidth with G‐shaped slot below the feed line to reject 5.15–5.85 GHz WLAN frequencies. The length of embedded slot not only depends on notch frequency and substrate dielectric constant but also depends on substrate thickness and slot width. In this letter, we have presented a technique to calculate accurately the slot length of the embedded slot. The simulated and measured result shows that the designed antenna is expected to be good candidate for UWB applications. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:99–104, 2015

A simple planar monopole UWB slot antenna with dual independently and reconfigurable band-notched characteristics

An extremely simple and compact planar monopole ultrawideband UWB slot antenna with dual band-notched characteristics is proposed. The antenna is composed of a circular radiation patch, a microstrip-fed line, and a partial ground. By etching an arc-shaped slot on the radiation patch and a C-like slot on the feed line, dual notched frequency bands at 3.3-3.7 GHz for WiMAX and 5.15-5.825 GHz for WLAN are achieved. And, the two notched bands can be adjusted independently by varying the length of the slots. Moreover, the band-notched characteristics can be reconfigurable by shorting the corresponding slots. So, the antenna is capable of operating in one of multiple modes which makes it an excellent candidate for UWB applications. Meanwhile, experimental results indicate that the antenna has an available impendence bandwidth from 2.9 to 11 GHz which covers the UWB frequency band, and nearly omnidirectional patterns, stable gains, small group delay in operating band except rejected bands. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:706-712, 2014.

Planar Wide Band Microwave Frequency Antenna with Different Radiator Shapes

This paper is a study on the performances of planar UWB monopole antennas using a radiator of dif- ferent shapes such as triangle, rectangle, square, circle, annual ring,ellipse (both horizontal and vertical), penta- gon and hexagon, for body-centric wireless networks us- ing PDMS substrate.The planar antennas consist of a radiator and a microstrip-feed line on one side of the substrate and a ground plane on the other side.PDMS substrate provides flexibility to the antenna which can withstand severe mechanical shock by flexing instead of breaking.

DESIGN OF COMPACT ASYMMETRIC COPLANAR STRIP-FED UWB ANTENNA WITH DUAL BAND-NOTCHED CHARACTERISTICS

In this paper, a new design of asymmetric coplanar strip (ACS)-fed UWB planar monopole antenna with dual band-notched characteristics is presented and investigated. The proposed antenna is composed of an asymmetric ground plane, a semi-circular radiator, together with two open-ended half wavelength bow-shaped slots etched on the radiation patch. This leads to the desired dual notched bands of 3.12{3.69GHz for WiMAX and 5.51{6.01GHz for WLAN. Experimental results show that the designed antenna, with compact size of 29:5 £ 12mm 2 , has stable and omnidirectional radiation pattern, sharp reduction in gain and group delay at notched frequencies. The very simple feeding structure and compact uniplanar design make it easy to be integrated within the portable device for UWB communication systems.

COMPACT PLANAR MONOPOLE UWB ANTENNA WITH QUADRUPLE BAND-NOTCHED CHARACTERISTICS

A compact planar monopole UWB antenna with quadruple band-notched characteristics is analyzed and presented. By introducing a C-shaped slot, nested C-shaped slot in the radiating patch and U-shaped slot in the feed line, quadruple band-notched characteristics are achieved at frequencies of 2.5, 3.7, 5.8 and 8.2GHz. The proposed antenna has been fabricated and tested. Measured impedance bandwidth of the antenna is 2.35{12GHz, which covers Bluetooth and UWB band, for VSWR 2, for rejecting 2.5/3.5GHz WiMAX, WLAN and ITU 8GHz band signals, respectively. The average gain of this antenna is 4.30dBi with a variation of §1:8dBi over the whole impedance bandwidth. Signiflcant gain reduction over the rejected band is also observed. The antenna shows good omnidirectional radiation patterns in the passband with a compact size of 40mm £ 34mm.

Band-notched UWB planar monopole antenna using slotted conductor-backed plane

In this letter, a planar antenna with band-notched characteristic is designed for ultrawideband application.Distinctive features of this antenna in comparison with the other reported antennas are the compact dimensions and omnidirectional radiation across the whole band of operation using slotted conductor-backed plane. The ground plane is located at the bottom layer, which also includes a Γ-shaped conductor-backed plane used to widen the impedance bandwidth. Also, band-notched characteristic is achieved by a Γ-shaped form inside the slotted conductor-backed plane. The measured results of the manufactured (18 × 18 mm2) antenna on 0.8-mm FR4 substrate show that the antenna operates with VSWR less than 2 over the frequency band from 3.05 to 12.9 GHz, except a frequency notched band of 3.3–4.3 GHz. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2237–2241, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27063