Microstrip-fed Printed Monopole Antenna Research Articles

Compact Tri-Band Notched Characteristics UWB Antenna for WiMAX, WLAN and X-Band Applications

Compact microstrip-fed printed monopole antenna with triple band-notched characteristics is suggested for ultra-wideband (UWB) applications. The antenna is constructed of a conventional rectangular microstrip patch antenna with partial ground plane and T-shaped strip employed in the ground plane as well as an inverted Ω- and L-shaped slots incorporated within the radiated element. The notched functions are created by the inverted Ω- and L-shaped slots, which are realized for WiMAX (from 2.69 to 4.5 GHz) and WLAN (from 5.49 to 6.37 GHz). The T-shaped parasitic strip generates the third notch for the X-band uplink satellite communication (from 8.15 to 9.61 GHz). The measured operating -10 dB bandwidth of the proposed antenna extends from 2.39 to more than 18 GHz except at the notched bands. The prototype antenna has a total area of 20×20×1.6 mm3. Electromagnetic (EM) simulations are carried out using 3D full-wave FEM-based simulator. EM simulation results are in good agreement with measurement results. The radiation pattern of the proposed antenna is nearly Omni-directional over the whole targeted band.

Printed Monopole Antenna for Ultra-Wideband Application with Tunable Triple Band-Notched Characteristics

In this paper, a compact ultra-wideband (UWB) microstrip-fed printed monopole antenna with triple band-notched characteristics is proposed. The proposed design consists of a radiating patch with two bevels at the bottom edge and the modified ground plane with two bevels of its upper edge to cause the wideband from 3.1 to 10.6 GHz for UWB application. Additionally, a triangular cut is introduced at the upper edge of the ground plane for improving the impedance matching beyond 6 GHz. The band notch at 3.4 GHz is achieved with a pair of slots along patch length and placed symmetrically on both the sides of the patch whereas notch band at 5.2 GHz is achieved using complementary split ring resonator (CSRR) on the patch. The third notch frequency at 5.8 GHz also achieved by using a pair of CSRR on the ground plane. The antenna size is 24 mm × 34.6 mm and designed using FR4 substrate having ?r = 4.4 and thickness of 0.8 mm. Design and optimizations have been carried out using HFSS v13.0 and there is good agreement with measured results. The proposed antenna exhibits a nearly omni-directional radiation pattern in the H-plane, and a dipole-like radiation pattern in the E-plane for the entire pass band.

Compact and Small Planar Monopole Antenna With Symmetrical L- and U-Shaped Slots for WLAN/WiMAX Applications

A small and compact triple-band microstrip-fed printed monopole antenna for Wireless Local Area Network (WLAN) and Worldwide Interoperability for Microwave Access (WiMAX) is presented. The proposed antenna consists of a rectangular radiating patch with L- and U-shaped slots and ground plane. A parametric study on the lengths of the U- and L-shaped slots of the proposed antenna is provided to obtain the required operational frequency bands-namely, WLAN (2.4/5.2/5.8 GHz) and WiMAX (2.5/3.5/5.5 GHz). The proposed antenna is small (15 × 15 × 1.6 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> ) when compared to previously well-known double- and triple-band monopole antennas. The simulation and measurement results show that the designed antenna is capable of operating over the 2.25-2.85, 3.4-4.15, and 4.45-8 GHz frequency bands while rejecting frequency ranges between these three bands. Omnidirectional radiation pattern and acceptable antenna gain are achieved over the operating bands.

A Novel Microstrip-Fed Monopole Antenna For WLAN/WiMAX Applications

A new microstrip-fed printed monopole antenna which is simple in design and compact in size is presented for simultaneously satisfying wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) bands. A simulation software package, CST Microwave Studio, has been used to model the proposed antenna, whose electrical characteristics and radiation performance are thoroughly analyzed as well. The proposed antenna, with small size of 28 × 51 mm2 on Rogers RT/Duroid® 5870 substrate with permittivity 2.33, was designed and fabricated. It was demonstrated that the measured 10 dB bandwidth for return loss is from 1.76 to 2.59 GHz, 3.44 to 3.89 GHz and 5.18 to 5.99 GHz, covering all the 2.4/5.2/5.8 GHz WLAN and 2.5/3.5/5.5 GHz WiMAX bands.

Multi-band modified fork-shaped monopole antenna with dual L-shaped parasitic plane

A novel microstrip-fed printed monopole antenna is proposed for WLAN and WiMAX applications. Using a modified fork-shaped strip, multiple impedance bandwidths covering 2.4/5.2/5.8 GHz WLAN and 5.5 GHz WiMAX bands are obtained. In addition, a dual L-shaped parasitic plane is inserted on the bottom of the FR4 substrate to cover the 3.5 GHz WiMAX band. Omnidirectional radiation patterns with appreciable gains over the operating bands are obtained by the fabricated antenna with a compact size of 34.5×18 mm2. Thus, the antenna is suitable for multi-band wireless communication applications.

Small microstrip‐fed printed monopole antenna for UWB application

AbstractIn this article by using the Babinet's Equivalence Principle and self‐complementary structure, we present a novel printed monopole antenna for ultra‐wideband (UWB) applications. The proposed antenna consists of a ground plane and radiating patch with a slot and a sleeve structure, which provides fractional bandwidth of more than 100%. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1756–1761, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25318

Multi-band monopole antenna with inverted U-shaped parasitic plane

A microstrip-fed printed monopole antenna having a parasitic plane is proposed for multi-band applications. By inserting an inverted U-shaped parasitic plane on the bottom of the dielectric substrate, the proposed antenna can easily cover DCS/UMTS/WiBro/2.4 GHz WLAN and 5.2/5.8 GHz WLAN bands at the same time. In addition, a Γ-shaped slit is inserted on the main patch to cover the GSM frequency band. Experimental and numerical results of the designed monopole antenna are presented and analysed.

Parametric analysis of a band-rejection antenna for UWB application

A compact and wideband microstrip-fed printed monopole antenna with the band-rejection characteristic is proposed. By adding a bent stub on the radiating patch and stepping the ground plane, the antenna provides an enhanced impedance-matching characteristic over the desired frequency band. The band-rejection characteristic is achieved by inserting an inverted-U shaped slot on the circular patch. The range of the rejection band can be adjusted by modifying the length and width of the inserted slot. The measured impedance bandwidth of the proposed antenna ranges from 2.9 to 12.1 GHz for VSWR < 2, excluding the rejection band. This antenna shows an omnidirectional radiation pattern similar to that of a monopole antenna. The measured maximum-gain variation is less than 4 dB over the operating-frequency band. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 47: 287–290, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21148