Ultra-wideband Planar Monopole Research Articles

INTEGRATED ULTRA-WIDEBAND PLANNAR MONOPOLE WITH CYLINDRICAL DIELECTRIC RESONATOR ANTENNAS

An ultra-wideband (UWB) planar monopole antenna integrated with a narrow-band (NB) cylindrical dielectric resonator antenna (DRA) is presented. The proposed antenna consists of a UWB monopole excited by a coplanar waveguide (CPW) transmission line, acting as a ground for a DRA excited by a slot. The mode HEM11- is excited in the NB DRA. To validate the concept of integration, an antenna is fabricated and measured. The measured results demonstrate that the UWB antenna provides a 2 : 1 voltage standing wave ratio (VSWR) bandwidth for 3.05{11GHz, integrated with a dual-band NB antenna. Moreover, the two ports have the same polarization and a reasonable isolation (less than i10dB) between each other. This is a promising candidate for applications in cognitive radio, where the UWB antenna can be used for spectrum sensing and the NB antenna for communication operation.

Planar UWB monopole antenna with dual band-notched characteristics for UWB applications

A simple and compact circular ultra-wideband (UWB) planar monopole antenna with dual band-notched characteristics is presented. By inserting a pair of two slots in the ground plane as well as adding a pair of arc-shaped parasitic strips around the radiating element, two notched frequency bands in the WiMAX/WLAN are achieved. Experimental results show a VSWR<2 bandwidth of 7.6 GHz for nondefected antenna and two highly rejected bands in the frequency region of 3.3–3.7GHz and 5–6GHz. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:241–245, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27301

Directional UWB antenna with a parabolic ground structure and split ring resonator for a 5.8 GHz band notch

A simple and compact circular planar monopole ultra-wide band antenna with a 5.8 GHz band rejection and directional radiation pattern is proposed in this paper. The split ring resonator (SRR) technique has been utilized to produce band rejection at 5.8 GHz. Some results and analysis on several SRR placements are highlighted in this paper. The parabolic ground structure is used to produce a directional radiation pattern together with bandwidth enhancement. The proposed prototype antenna has acceptable performances in terms of gain, efficiency, and directional radiation pattern. Simulated and experimental results are discussed.

Meandered Corner Planar Monopole Antenna for UWB Applications

In this paper, an ultra-wideband (UWB) planar monopole antenna is proposed whose design is quite simple in profile. The anticipated antenna is composed of a rectangle with corner truncation applied on each corner, with the slits on three truncated corners and a rectangular slot in the middle of patch. The simulated results are obtained using HFSS (High Frequency Structure Simulator) and furthermore the antenna is fabricated on RT Roger Duroid 5880 with the substrate dimensions of 30 mm2 and the height is 0.787 mm with relative permittivity of 2.2. To acquire the maximum bandwidth, a comprehensive parametric study has been carried out to optimize the dimensions of an antenna. Both; the simulated and measured results attests that antenna has wide bandwidth, which ranges from 1.65 GHz to 17.6 GHz and 1.65GHz to 14.5GHz (S11<-10) respectively, along with fine characteristics like good gain, stable radiation pattern and consistent impedance matching.

UHF 대역용 CPW 급전 초광대역 평면형 모노폴 안테나

In this paper, a novel ultra-wideband planar monopole antenna for the UHF communications and Digital-TV reception is proposed. The proposed antenna fed by a coplanar waveguide(CPW) is based on a triangular patch that has a broadband characteristic. To further increase the bandwidth of the triangular patch antenna, the top side of the regular triangular patch is loaded with a notch cut and each oblique side with a step. In addition, a slope is given to the ground plane of the CPW structure. Experimental results show that the -10 dB return loss bandwidth of the proposed antenna is 2,320 MHz from 480~2,800 MHz(5.83:1 bandwidth), which covers all the frequency bands of the various wireless communication systems and Digital TV broadcasting in the UHF band. Within the entire operating frequency range, the measured antenna gain in y-z plane(E-plane) varies from 3.01 to 4.71 dBi.

Design of Ultrawideband Antenna with Multiple Band-Notched Characteristics

A planar ultra-wideband monopole antenna with multiple notched bands characteristics is presented. The antenna satisfies the VSWR requirement of less than 2.0 in the frequency band between 2.84 and 12 GHz, except four frequency stop-bands of 3.2–4.1 GHz, 5.0–5.4 GHz, 5.79–6.07 GHz and 6.6–7.8 GHz. By employing a hookshaped defected ground structure (DGS) in each side of the ground plane, embedding an Ω-shaped slot on the radiating patch, adding a semi-octagon-shaped resonant ring on the back side of the antenna and etching a u-shaped slots beneath the feedline, multiple notched frequency bands are achieved. The antenna shows fairly stable radiation pattern, good group delay and transmission characteristics over the frequency range of interest. The fidelity (F) and the time window containing 90% of the transmitted energy (RE90) are resorted to estimate the time domain characteristics of the proposed antenna.

Design and implementation of UWB planar monopole antenna with dual-band rejection characteristics

In this letter, we design a planar monopole antenna with dual-band rejection characteristics for ultrawideband (UWB) wireless communication.The proposed antenna has a radiating patch with two slots. Owing to these two slots, dual-notched properties are achieved in the world interoperability for microwave access and wireless local area network bands. A high-frequency structure simulator is used to analyze the proposed antenna in the design process and to compare the simulation and experimental results. The bandwidth of the proposed antenna is measured as 3.0–11.0 GHz for voltage standing wave ratio of less than 2, except for the dual rejection bands of 3.13–3.83 GHz and 5.10–5.80 GHz. The measured maximum gain is ∼7.51 dBi at 10.0 GHz. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:990–993, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26707

Technique for minimising the effects of ground plane on planar ultra-wideband monopole antennas

A common problem with current planar ultra-wideband (UWB) monopole antennas is that their performance is heavily affected by the size of the ground plane. This is due to the fact that dimensional changes influence the characteristic modes excited on the ground plane, which directly affects the impedance and the radiation behaviour of the antenna. A technique of cutting slots on the ground plane is proposed to solve this problem. Owing to the presence of slots, the slot modes will be introduced. The optimal dimensions of the slots can produce strong coupling between the slot modes and the ground plane modes. This coupling makes the characteristic modes of planar UWB monopole insensitive to the changes in the size of the ground plane, hence effectively minimising the dependence of the antenna on the dimensions of the ground plane. Furthermore, a parametric study on the major geometric parameters of the slots is given to achieve an optimised design. Using this technique, two different UWB monopole antennas are investigated to observe the effectiveness. Both simulated and measured results demonstrate that this method can minimise the effects of dimensions of the ground plane on the impedance matching with very little effect on the other antenna parameters, such as radiation pattern, gain and time-domain performance.

Ultra-wideband planar monopole antenna with parametric study

Broadband planar trapezoidal monopole antenna is proposed and an analysis of parametric change is given. Techniques are applied to preliminary structure to obtain better impedance matching and broader bandwidth. The proposed Ultra Wideband planar monopole antenna has an operating bandwidth of 0.55–11.5 GHz (S11⇐−10 dB) and a gain of 1–9.5 dB.

A COMPACT UWB ANTENNA WITH SHARP DUAL BAND-NOTCHED CHARACTERISTICS FOR LOWER AND UPPER WLAN BAND

A compact dual band-notched Ultra-Wideband antenna with sharp band-notched characteristics and controllable notched bandwidths is presented. The antenna consists of a spade-shaped microstrip-fed Ultra-Wideband planar monopole antenna and two sets of band-notched structures. The band-notched structures are employed to generate the desired lower and upper rejection bands with good frequency selectivity and su-cient rejection bandwidths. Moreover, the bandwidth of the lower and upper rejection bands can be independently adjusted by changing the size of the band-notched structures. Finally, a UWB antenna is successfully designed with the dual notched bands for the lower WLAN band (5.15{5.35GHz) and upper WLAN band (5.725{5.825GHz). A good impedance match is obtained in 3.1{10.6GHz frequency range (jS11j i5dB). The ratios of the notched bandwidths between i5dB and i10dB in the two stop bands are greater than 0.73.

Band-notched ultra-wideband planar monopole antenna using shunt open-circuited stub

This article presents an ultra-wideband planar monopole antenna with band-notched characteristics.The proposed antenna consists of a sector monopole and a microstrip feedline with a quarter-wavelength open-circuited transmission line (a stub). The open-circuited stub is connected in parallel with the microstrip feedline in order to achieve band-notched performance. The measured impedance bandwidth for voltage standing wave ratio (VSWR) ≤ 2 is from 3.01 to 11 GHz, except the notched band of 5.08 to 5.96 GHz for the WLAN system. This design technique is very suitable to develop other planar antennas for band-notched applications. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26054

UWB Band-Notched Monopole Antenna Design Using Electromagnetic-Bandgap Structures

A new approach is proposed to reject certain bands within the passband of an ultra-wideband planar monopole antenna. The proposed approach that utilizes a mushroom-type electromagnetic-bandgap (EBG) structure is proven to be an effective way for band-notched designs. The approach has many advantages, such as notch-frequency tunability, notch-band width controllable capacity, efficient dual-notch design, and stable radiation patterns. Several design examples using conventional mushroom-type EBG and edge-located vias mushroom-type EBG are presented. The examples exhibit good bandstop characteristics to reject the wireless local-area network interference bands (5.2- and 5.8-GHz bands). Besides, the causes that lead to the discrepancies between the simulations and measurements are discussed.

UWB ANTENNA WITH DUAL BAND REJECTION FOR WLAN/WIMAX BANDS USING CSRRS

A compact microstrip-fed ultra-wideband (UWB) planar monopole antenna with dual band rejected characteristic is presented in this paper. By etching two identical square complementary split ring resonators (CSRRs) in the radiation patch, dual band rejections in the WiMAX and WLAN bands are achieved. The proposed antenna, with the size of 30£34mm 2 , has been constructed and tested. And the measured results show that the antenna can operate over the frequency band between 3 and 11GHz for VSWR < 2 with dual band notches of 3.4{3.6GHz and 5.1{5.9GHz. Besides, in the working bands, the antenna shows good omnidirectional radiation patterns in the H-plane and monopole-like radiation patterns in the E-plane and has good time-domain characteristic as well.

Switchable double band-notch ultra wideband monopole antenna

In this paper, a novel small dual band-notch ultra-wideband planar monopole antenna with switchable functions is presented. Impedance bandwidth of the proposed antenna is approximately 136% with VSWR<2 in the frequency range of 2.2GHz-11.6GHz. By inserting a U-shaped slot and SES structures on the patch of antenna, the dual band-notch characteristics are obtainable. The technique of on/off switching of notched bands is based on mounting three pairs of PIN diodes at a certain locations on antenna structure.

Compact dual-band-notched UWB planar monopole antenna with modified SRR

To prevent interference problems due to existing nearby communication systems within an ultra-wideband (UWB) operating frequency, a compact dual-band-notched UWB antenna is presented. This antenna consists of a trapezoidal ground plane with a rectangle slot, a Y-shaped monopole used as the radiator, together with a modified complementary co-directional splitering resonator (SRR) etched on the radiation patch, which leads to the desired dual notched bands for lower and upper bands of the WLAN. Experimental results show that the designed antenna, with compact size of 24×25 mm, has a wide bandwidth covering 3.05–14.2 GHz, realising dual notched bands of 5.14–5.36 and 5.74–6.07 GHz.

A π/4 bi-orthogonal monopole antenna for operation on and beyond of the UWB band

An ultra-wideband (UWB) π/4 bi-orthogonal monopole antenna with a highly omnidirectional radiation pattern in the azimuthal plane with a quasi-independent on the frequency behavior is presented in this article. Here, it is shown that by combining two orthogonal UWB planar monopole elements rotated 45° with respect to each other in a single structure, it is possible to enhance the performance of the radiation pattern at high frequencies of the operational bandwidth without affecting the radiation pattern at lower frequencies. The measured antenna bandwidth goes from 2.82 to 16.7 GHz for a reflection coefficient lower than −10 dB. The radiation pattern remains almost omnidirectional, and it is enhanced with respect to a conventional single planar monopole antenna of similar characteristics. The basic element used for both the single and the proposed π/4 bi-orthogonal UWB planar monopole antenna has a rectangular shape, whose impedance bandwidth ratio is achieved based on the bevelling and height-width ratio techniques. Although the antenna prototype presented in this article has an operational bandwidth of 13.88 GHz, it is possible to design a UWB monopole antenna with the shape and structure proposed here, but for different bandwidths following a design methodology suggested also in this article. © 2010 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2011.

Band-Rejected Ultrawideband Planar Monopole Antenna With High Frequency Selectivity and Controllable Bandwidth Using Inductively Coupled Resonator Pairs

A novel band-rejected ultrawideband (UWB) planar monopole antenna is investigated. By utilizing the resonance nature of folded strips and a new inductive coupling scheme, the antenna demonstrates bandstop-filter-like response with high frequency selectivity and controllable bandwidth at the rejection band. The design methodology is introduced. The simulated and measured results including impedance matching, radiation patterns, and gain responses are investigated. An antenna equivalent circuit model with improved accuracy is discussed as well. When compared with our previous work, the new design demonstrates substantial improvements in many aspects. The argument will be discussed and verified carefully throughout the communication.

Study of an Ultrawideband Monopole Antenna With a Band-Notched Open-Looped Resonator

A novel band-notched planar monopole ultrawideband (UWB) antenna is proposed. A notched band, located in the 5 GHz WLAN band, is created using a resonator at the center of a fork-shaped antenna. The resonator is composed of an open-looped resonator and two tapped lines. With the open-looped resonator, the antenna has a good band-notched performance and bandstop-filter-like response in the target band. A parametric study of the notched bandwidth is described that explored the antenna operating mechanism. Then, an equivalent circuit model illustrates the band-notched behaviors more clearly. The antenna input admittance calculated with the equivalent circuit model reasonably agrees with the HFSS simulated result. The proposed antenna also features flat gain frequency responses, small varied group delay and 15 to 35 dB gain suppression at the notched band. Accordingly, the band-notched antenna can effectively select target bands by adjusting these antenna parameters.

A Design of Ultrawide Band Planar Monopole Antenna Based on Microstrip Pentagonal Patch

An ultra-wide band planar monopole antenna is presented in this paper. This antenna uses a pentagonal patch as radiation unit and is fed by a microstrip line. The relevant simulation is performed by using Ansoft HFSS. The return loss curve and the radiation patterns of this new antenna are given. And the effect of the size of the various parts of the antenna on the reflection loss is analyzed. Experimental results show that the proposed antenna provides an ultra-wide bandwidth (1.70~12.90 GHz) for return loss less than -10dB (VSWR&lt;2). It is suitable for current ultra-wide band communication systems.

Profile optimisation in planar ultra-wideband monopole antennas for minimum return losses

Optimised profile ultra-wideband planar monopole antennas designed for minimum return losses are presented. Two different procedures based upon the simulated annealing algorithm and the finite element method are considered in order to achieve the minimum return losses possible in the 2-11 GHz frequency band. As a result of both procedures, two different designs have been obtained. Simulations using an infinite ground plane show that lower than 14 and 18 dB, respectively, return losses were obtained for each design. With these results, two prototypes were built and measured, one for each procedure. Lower than 13 and 18 dB return losses were measured in each final design using a 10 cm radius ground plane. Very good agreement between experimental and numerical results is achieved. To conclude the analysis, radiation characteristics of both prototypes are also studied both using an infinite ground plane and taking into account the 10 cm radius ground plane.