A Dual H-Shaped Ultrawideband Antenna for AAV-Based Ground Penetrating Radar

An ultrawideband (UWB) antenna that rejects extremely sharply the two narrow and closely-spaced U.S. WLAN 802.11a bands is presented. The antenna is designed on a single surface (it is uniplanar) and uses only linear sections for easy scaling and fine-tuning. Distributed-element and lumped-element equivalent circuit models of this dual band-reject UWB antenna are presented and used to support the explanation of the physical principles of operation of the dual band-rejection mechanism thoroughly. The circuits are evaluated by comparing with the response of the presented UWB antenna that has very high selectivity and achieves dual-frequency rejection of the WLAN 5.25 GHz and 5.775 GHz bands, while it receives signal from the intermediate band between 5.35-5.725 GHz. The rejection is achieved using double open-circuited stubs, which is uncommon and are chosen based on their narrowband performance. The antenna was fabricated on a single side of a thin, flexible, LCP substrate. The measured achieved rejection is the best reported for a dual-band reject antenna with so closely-spaced rejected bands. The measured group delay of the antenna validates its suitability for UWB links. Such antennas improve both UWB and WLAN communication links at practically zero cost.

The design and results of Ultra-wideband dual polarization bowtie antenna arrays with backed cavity is presented in this paper. A single-pole of the Array element is composed of ellipse mixed structure with triangle. Placing two cross dipole, the whole unit can realize the function of dual polarization. Adding a reflector and a director can increase bandwidth, the gain, also can improve high-frequency pattern. Antenna array consists of 12 elements. Elements layout according to the rectangular grid and the advantage of this structure is simple, easy to adjustment and also can realize the function of multiple-input multiple-output. The design of ultra-wideband dual polarization bowtie antenna arrays with backed cavity can achieve the function of dual-polarization, wide bandwidth, high gain, light weight, low cost and low profile.

Ultra Wide Band (UWB) antenna from range from 3.1 to 10.6 GHz is field of research after its release in 2001 by Federal Communication Commission (FCC). Dual notch antenna has been proposed in this paper. It is monopole elliptical UWB antenna having microstrip line as a feedline. Dual band rejection is done with the help of via shorted complimentary split ring resonator (VSCSRR) metamaterial structure placed near the feedline. These structures disturb the current distribution and act as stop band filter rejecting 5.1 to 5.8 GHz of WLAN and 3.3 to 3.7 GHz of WiMAX band of frequencies. Due to dual notch characteristics the interference from ISM band namely WLAN and WiMAX to UWB band can be reduced considerably. Such UWB antenna is suitable for wide range of applications.

In this paper, a dual spiral antenna for ultra-wideband capsule endoscope system is proposed. Since a capsule endoscope system which transmits real-time image data in the body should have ultra-wideband characteristic, an ultra-wideband antenna is suitable for this system. When an antenna is used as capsule endoscope system, a small sized antenna is required because capsule is small enough to be swallowed. For these two conditions, the proposed antenna has dual resonance structure which is composed of two different spiral elements and single feed wire connects these two elements. The bandwidth of the proposed antenna is 411~600 MHz (189 MHz) for VSWR<2 which means the fractional bandwidth of 37.8% and it has isotropic radiation pattern. The height of the proposed antenna is 7 mm and diameter is 10 mm. Because of ultra-wideband characteristic and small size, the proposed dual spiral antenna is suitable for ultra-wideband capsule endoscope system.

ABSTRACTA two port ultra wideband(UWB) and dual narrowband antenna for cognitive radio(CR) applications is reported. In this letter an elliptical patch is used as an UWB sensing antenna which is coplanar waveguide (CPW)‐fed transmission line with elliptically tapered ground plane. A rectangular slot is etched from the radiating patch to integrate the narrow band communication antenna where basically the surface current density is effectively low. Within the slot a triangular monopole with meander line LC (inductance–capacitance) resonator in the feed helps to realize dual narrowband (NB) communication antenna. This proposed antenna is a potential candidate for cognitive radio application where the elliptical patch antenna covers the UWB frequency range (3.1–10.6 GHz) with stable radiation patterns for spectrum sensing and the triangular monopole with meander lines LC resonator in the feed behaves as dual band communication antenna with first band operating at WLAN 5.04 GHz (4.48–5.4 GHz) and second band operating at X band satellite communication at 7.6 GHz (7.4–7.76 GHz) with isolation less than −10 dB in the whole operating band between the two antenna ports. The prototype of the proposed antenna has been fabricated and its S‐parameters in terms of S11, S22, S21 as well as radiation patterns were measured that shows good agreement with simulated results. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1973–1978, 2016

A new planar multiple-input–multiple-output (MIMO) antenna for ultra wideband (UWB) applications is presented. The proposed antenna operates over the frequency band from 3.1 to 10.6 GHz and it consists of two identical circular monopoles on an FR4 substrate. The wide isolation is achieved through a novel planar decoupling structure that is being inserted between the dual antennas. Moreover, a center slot is etched on the common ground to further increase isolation. The effectiveness of the decoupling structure is analyzed, and performance study has been performed to investigate the mutual coupling reduction. A good isolation of more than 31 dB has been achieved through the entire UWB band (more than 12 dB improvement over the reference antenna). The proposed UWB antenna with and without the wideband decoupling structure has been investigated and verified both numerically and experimentally. The measurement results of the proposed UWB–MIMO antenna are in good agreement with the simulation results. The proposed UWB antenna has been compared with previous works regarding antenna size, geometric complexity, bandwidth, and isolation level. The proposed antenna has some outstanding characteristics such as a geometric simplicity, compact size, broad bandwidth, and low correlation which give the antenna an excellent diversity performance and a good candidate for UWB applications.

In this paper, the complementary split ring resonator (CSRR) is studied and applied to design a printed ultra wideband (UWB) antenna with dual band-notched characteristics. Dual band-notched function is obtained by incorporating the CSRR in the radiating element and the ground plane of the proposed UWB antenna. The designed antenna has a small size and operates over the frequency band from 3.2 GHz to 13.5 GHz, with dual-band rejection at 3.5 GHz (WiMAX band) and the other at 5-6 GHz (WLAN band). The antenna electromagnetic characteristics such as the S (11) parameter, the radiation pattern and the gain are simulated using HFSS and CST. The obtained results are in good agreement and show that the proposed antenna can be used for UWB applications.

A novel ultrawide band (UWB) antenna with dual band-notched characteristics is presented. The first band rejection is provided by an arc H-shaped slot on the radiating patch. The parametric study of the arc H-shaped slot shows that this structure enables rejectband characteristic with improved control compared to traditional H-shaped slot. Based on the single band-notched UWB antenna, the second notched band is realized by etching narrow slots on the ground plane. By tuning the parameters of these slots, the proposed UWB antenna can operate from 2.9 GHz to above 10 GHz, except for the bandwidth of 3.3–3.6 GHz for WiMAX application and 5.1–5.9 GHz for WLAN application. Simulated and measured results show that the proposed antenna provides excellent band rejection and is a good candidate for future UWB application.

A compact dual band-notch ultra-wideband polygon slot antenna with two parasitic slits is presented. The antenna is as small as 16 × 25 × 0.8 mm. The proposed antenna yields an impedance bandwidth of 3.1-10.6 GHz with VSWR < 2, except for the bandwidths of 3.33.9 GHz for WiMAX and 5-6 GHz for WLAN. The antenna has been successfully simulated, designed and measured, showing good impedance matching, stable gain and near omnidirectional radiation patterns.

A novel planar ultrawideband (UWB) antenna with dual notched bands is proposed and investigated in this paper due to that UWB system is easy to be interfered with the narrow-band signals. The antenna consists of a square radiating patch and a modified grounded plane. To realize dual band-notched characteristics, a T-shaped stub embedded in the square slot of the radiation patch and a pair of U-shaped slots in the ground plane is utilized. The simulation results indicate that the designed dual band-notched planar antenna shows a very wide bandwidth from 1.9 to 12.5 GHz defined by voltage standing wave ratio VSWR<2 except the bandwidth of WiMAX and WAVE for band notched, which minimized the potential interferences between the ultrawideband systems and the narrowband communication systems effectively.

We propose a compact planar ultrawideband (UWB) antenna with 3.4/5.5 GHz dual band-notched characteristics. The antenna consists of a beveled rectangular metal patch and a 50 Omega coplanar waveguide (CPW) transmission line. By etching two nested C-shaped slots in the patch, band-rejected filtering properties in the WiMAX/WLAN bands are achieved. The proposed antenna is successfully simulated, designed, and measured showing broadband matched impedance, stable radiation patterns and constant gain. An equivalent circuit model of the proposed antenna is presented to discuss the mechanism of the dual band-notched UWB antenna. A UWB antenna and a single band-notched one are also provided for references.

Compact ultra-wideband (UWB) antenna with dual band characteristics is presented. Simulation of the design is done using HFSS 12.1 and the return loss parameters of the design are presented. The design is an omega type in which by reducing the size and varying the centre position of the circle the dual band characteristics for the frequency of 3-3-5.1 GHz and 7.9–9.9 GHz with the bandwidth of 1.89 GHz and 2GHz with − 22dB and −32 dB return loss respectively. Simulated Results show that the design is a good candidate for the UWB Antennas.

The ultra wide band (UWB) antennas play a vital role in supporting different wireless standards and are suitable for wide variety of applications. This paper is aimed to present a novel UWB dual notch microstrip antenna with modified ground plane. The antenna is designed to operate in UWB ranging from 2 GHz to 12 GHz with multi band operation. This will help in operating the antenna for different operations independently. The proposed structure will operate in two notch bands 3.3-4 GHz (Wi-MAX), 5.05-5.9 GHz (WLAN) and the structure is suitable for long distance communications because of its increased directivity. The structure can also be used for X-Band applications for various applications of traffic control, weather forecasting and vehicle speed detection systems. It is observed that, the proposed structure is offering a gain of 5.2 dBi with improved directivity with a beam width of 42.230. This makes the antenna structure suitable for long distance satellite communications. The antenna is supporting the circular polarization at higher the frequencies and can be useful for the upcoming 5G mobile applications. Moreover, the proposed structure offers the less interference at the receiver. The structure is found to be smaller in dimensions, easily fabricated at low costs and can be integrated into any compact wireless devices. The structure is simulated using a commercially available software Ansys-HFSS and is analyzed.

Since the first Report and Order by the Federal Communications Commission (FCC) authorized the unlicensed use of ultra wideband (UWB) which must meet the emission masks on February 14, 2002 [1], both industry and academia have paid much attention to R&D of commercial UWB systems. Among UWB system design, the UWB antenna is the key component. Recently, a considerable amount of researches have been devoted to the development of the UWB antenna for its enabling high data transmission rates, low power consumption and simple hardware configuration in communication applications such as radio frequency identification devices, sensor networks, radar, location tracking, etc. Nowadays, the planar printed antenna fed with a microstrip line or a coplanar waveguide (CPW) has received much attention due to its high radiation efficiency and compact size and can be easily integrated with the other circuit. However, compared to the microstrip-fed antennas, the CPW-fed antennas are very good candidates since the feed line and slots are on one side of the substrate [2]. In order to obtain ultra wideband, the different optimum metal radiation patch geometries have been developed, like fork shape [3], elliptical shape [4], square shape [5], spade shape [6], circle shape [7], or made some modifications about the radiation patch [8]. Besides, over the designated frequency band, there exist some narrow bands for other communication systems, such as WiMAX operating in the 3.3 to 3.6 GHz band, and WLAN operating in the 5.15 to 5.825 GHz. They may cause communication interference with the UWB system. To solve this problem, it is desirable to design antennas with band notched characteristics to minimise potential interference. Several UWB antennas with frequency band notched function have been reported recently. The reported antennas are generally embedded with a half-wavelength structure such as a ω-shaped slot [2], a Ushaped slot [4], a C-shaped slot [8], or a V-shaped slot [9]. But most reported antennas were designed with only one notched band, mainly discussed on WLAN frequency band 5.15 to 5.825 GHz. UWB antennas with dual notched band were recently reported. In [10], the dual notched bands were formed by two nested C-shaped slots embedded in the bevelled patch. A pair of asymmetrical spurlines on the feedline was used to achieve dual notched band in [11]. A recently reported antenna has been designed by making use of two split resonant rings (SRR) to obtain dual band-notched characteristics [12]. Nevertheless, the geometry of the SRR structure is relatively complex. In this paper, a CPW-fed novel planar ultra-wideband antenna with dual band-notched characteristics is introduced. In order to obtain ultra wideband, some modifications about

A compact reconflgurable antenna integrated with stepped impedance stub (SIS) loaded stepped impedance resonator (SIR) and SIS loaded hexagon stepped impedance resonator (HSIR) for ultra wideband (UWB) applications is proposed in this paper. The reconflgurable UWB antenna can work as a UWB antenna and a dual notch band UWB antenna by controlling the switches ON and OFF. The proposed two notch bands are obtained by embedding a SIS-HSIR on hexagon radiation patch and a SIS-SIR on coplanar waveguide (CPW) excitation line. The reconflgurable characteristic is achieved by means of two ideal switches. The proposed reconflgurable antenna has been designed, fabricated and measured. The experimental results show that the proposed reconflgurable antenna has a multi-mode function and good omni-directional characteristics.