Dual Band-notched UWB Antenna Research Articles

A miniaturized microstrip antenna with tunable double band-notched characteristics for UWB applications

This paper proposes the step-by-step design procedure for obtaining independent dual band-notch performance, which provides a valuable method for designing tunable dual band-notched UWB antenna. The proposed antenna consists of the semicircle ring-like radiating patch with an elliptical-shaped slot and double split ring resonators on the top surface of the substrate and defected ground structure (DGS) on the bottom surface of the substrate. The operating frequencies ranged from 1.3 to 11.6 GHz (S11 < − 10 dB). By loading varactor diodes at the gap of the resonators structure and changing the varactor diode’s reverse bias voltage(0–30 V), a wider band-notched tuning range from 2.47–4.19 to 4.32–5.96 GHz can be achieved, which covers the whole WiMAX band and WLAN band. The experimental results agree well with the simulated results. The notched gain at notched frequency points is about − 5.3 dBi and − 5 dBi, demonstrating that the narrow-band interference signal could be efficiently suppressed. The security of UWB communication systems can be further enhanced. Meanwhile, the selection of varactor diode and DC bias circuit are fully considered. Hence, the accuracy of the experiment results and antenna operating performance have been improved. Furthermore, the proposed antenna only has an electrical size of 0.26λ*0.19λ at 1.3 GHz. Compared to the related reported antennas, the proposed antenna has achieved a simpler structure, low profile, compact size, tunable dual band-notched characteristics, extensive independent tunable range, and good band-notched performance simultaneously, to the best of our knowledge. The proposed antenna is believed to have a valuable prospect in UWB communication, Wireless Body Area Network, Industry Science Medicine, mobile communication applications, etc.

Characteristic Mode Analysis-Based Compact Dual Band-Notched UWB MIMO Antenna Loaded with Neutralization Line.

The advancement of electronic gadgets makes it possible for a device to be multipurpose, which calls for attributes such as compactness and larger bandwidth, with improved data transfer rate. This paper introduces the compact, closely placed two-port dual band-notched UWB antenna using a neutralization line as a decoupling structure. The projected antenna design comprised a circle and rectangle embedded monopole radiator with the defected ground structure to attain the UWB spectrum. Further dual notches are attained by carving the U-shape and inverted U-shape slots on the feedline and radiator. The dual band-notched UWB antennas are placed with the separation of 3.8 mm (0.04 λ; λ is computed using 3.4 GHz frequency). The coupling effect between the close proximity elements is decoupled using the neutralization line. The presented antenna has overall dimensions of 21.5 × 28 × 1.6 mm3 (0.24 × 0.31 × 0.01 λ3) and exhibits S11 below −10 dB from 3.4–11.9 GHz, with isolation better than 16 dB throughout the impedance bandwidth. The antenna also provides frequency band rejection of 4.5–5.3 GHz and 7.2–9 GHz covering the WLAN and entire X-band satellite communication. The projected antenna is explored through characteristic mode analysis, time-domain characteristics, and MIMO diversity features to analyze the effectiveness and usefulness of the antenna. The group delay is less than 1 ns except for the frequency rejection band and fidelity factor greater than 0.96. The projected antenna exhibits MIMO diversity metrics ECC < 0.3, DG > 9.6 dB, MEG < −3 dB, TARC < −10 dB, CCL < 0.3 bps/Hz, and ME < −2 dB across the operational frequency, except for the notched bands. The designed two-port antenna is validated by printing on an FR4 substrate. The simulated and measured findings are in line with and appropriate for MIMO wireless applications.

Dual Band-Notched Microstrip-Fed UWB Antenna for Wearable Medical Applications

Dual Band-Notched Microstrip-Fed UWB Antenna for Wearable Medical Applications

Design and circuit analysis of a single and dual band-notched UWB antenna using vertical stubs embedded in feedline

Within the frequency band designated by the FCC for UWB systems, there are other frequency bands that are also designated for use for other technologies like WLAN (5.15 – 5.35 GHz) and WiMAX (3.3–3.7 GHz). These systems can cause interference with UWB systems when operated at the same time. Therefore, an antenna operating in the UWB spectrum needs to have band-notch capabilities in order to mitigate interference resulting from nearby communication systems operating within the UWB frequency band. In this paper, the notched bands are achieved by using vertical stubs protruded from a microstrip feedline. The antenna is etched on a 25 × 30 mm2 substrate. Two antenna structures are presented; one is designed to notch an intended narrowband from 3.3 – 3.6 GHz and the second is designed to include an additional band notch from 5.15 – 6 GHz. The simulations and measurements show that the proposed antennas achieve an ultra-wide bandwidth of 3–10.6 GHz with successful single and dual band-notches, good gain and good group delay rejection in the notch bands. Stable radiation patterns with low cross polarization are also realized across the operating bandwidth. A detailed analysis of how the filtering is also achieved using circuit theory is presented in this work as well.

A compact fractal dual high frequency band notched UWB antenna with a novel SC-DGS

A compact and novel fractal dual band notched UWB antenna with time domain characteristics is presented. A tapered microstrip fed circular fractal radiating patch along with a novel semi circular defected ground structure produce − 10 dB bandwidth from 3.73 to 16.7 GHz. The proposed antenna is a miniature size of 16 × 21 mm2 and is printed on FR-4 substrate with two high frequency notched bands from 7.29–7.76 GHz to 9.53–11.17 GHz to notch X-band satellite communications link by incorporating L and C-shaped parasitic elements respectively. The proposed antenna exhibits a uniform gain of 2–4.26 dBi, flat group delay around 1.2 ns, and peak radiation efficiency about 96% in operating frequencies makes it suitable for wireless UWB portable devices.

Single and Dual Band-Notch UWB Antenna Using SRR / CSRR Resonators

Single and Dual Band-Notch UWB Antenna Using SRR / CSRR Resonators

A CPW fed Dual Band Notched UWB Antenna for Wireless Medical Applications

A CPW fed Dual Band Notched UWB Antenna for Wireless Medical Applications

Compact Dual Band-Notched Characteristics UWB Antenna Using Nested G-Shaped Slots

Compact Dual Band-Notched Characteristics UWB Antenna Using Nested G-Shaped Slots

Planar high rejection dual band-notch UWB antenna with X &amp; Ku-bands wireless applications

In this paper, a vase-shaped monopole antenna is presented for dual band notch (WiMAX IEEE802.16 3.30–3.80 GHz with C-band 3.80–4.20 GHz and WLAN IEEE802.11a/h/j/n 5.15–5.35 GHz, 5.25–5.35 GHz, 5.47–5.725 GHz, 5.725–5.825 GHz) UWB and other wireless services (close range radar: 8–12 GHz in X-band &amp; satellite communication: 12–18 GHz in Ku-band). Measured VSWR of proposed antenna shows a high band-rejection for WiMAX along with C-band with VSWR = 25.33 at 3.77 GHz and WLAN with VSWR = 6.0 at 5.64 GHz is achieved by cutting two C-shaped slots on the radiating patch. Designed antenna covers a wide usable fractional bandwidth 160% (2.58–20.39 GHz). Furthermore, the measured gain of antenna is relatively stable across the impedance bandwidth except band-notched. In addition, antenna offers omni-directional pattern, reasonably small 20 × 20 × 0.787 mm3and easy to construct structure.

A Design Approach of GSM, Bluetooth and Dual band Notched UWB Antenna

In this paper, printed GSM Bluetooth dual band notch UWB antenna is presented. In this prototype corner cut patch for Bluetooth application and dual band notch characteristics of UWB antenna perform by inverting USlot in the radiation patch of antenna. With the enclosing of λ/4 stub in the patch of antenna for GSM (1.7101.885 GHz) band operation. Simulation results show that the antenna yields an impedance bandwidth of 2.42.48 and 3-11 GHz with -10 dB reflection coefficients, except for the dual notched bands of 3.3-3.7 for WiMAX and 5.15-5.825 GHz for WLAN. The electrical characteristics in frequency domain show suitability of this antenna for use in UWB systems.

Design of Compact Dual Band-Notched UWB Antenna Using Slotted Conductor-Backed Plane

A planar ultra-wideband antenna with dual band-notched characteristics is proposed. The main features of the proposed antenna are the compact dimensions and band-notched characteristics that are achieved without modifying the radiator or the ground plane. The antenna consists of a square patch as radiator, a partial ground plane and a slotted conductor-backed plane. The dual band-notched characteristics are achieved by a U-shaped slot and a pair of mirror inverted L-shaped slots at the conductor-backed plane. By inserting a U-shaped slot with variable dimensions on the conductor-backed plane, additional resonances are excited and hence much wider impedance bandwidth can be obtained, especially at the higher band. The measured results show that the proposed antenna operates over the frequency band between 2.8 and 14.8 GHz (137 %), defined by S11 < − 10 dB, except two notched bands WiMAX (3.3–3.6 GHz) and WLAN (5.15–5.825 GHz). The designed antenna has a small size of \({18 \times 18}\) mm. The antenna has a desirable VSWR level, radiation pattern and gain characteristics for ultra-wideband frequency band range.

A dual band-notched UWB antenna with hook-shaped slots and folded stubs

A dual band-notched UWB antenna with hook-shaped slots and folded stubs

Compact dual band-notched UWB antenna with hexagonal slotted ground plane

A novel compact dual band-notched ultra-wide band antenna with hexagonal slotted ground is proposed. By inserting two pairs of L-shaped branches symmetrically into the slotted ground plane, two notched bands, 3.3–3.7 GHz for worldwide interoperability for microwave access and 5.15–5.825 GHz for wireless local area network, are achieved, respectively. A prototype of the proposed antenna is designed, fabricated, and tested. By optimizing the length of the L-shaped branches and the gap between them, the desired bandwidth of VSWR (voltage standing wave ratio) less than 2.0 can be achieved, ranging from 2.5 to 11 GHz, except two stop-bands of 3.1–4.0 and 5.0–6.0 GHz. The simulated and measured results of the proposed antenna have shown a reasonable agreement between them. The proposed antenna has a compact size, ultra wide bandwidth, good radiation characteristics, and good time-domain behaviors. It is very suitable for modern wireless communication applications.

UWB PRINTED SLOT ANTENNA WITH DUAL BAND-NOTCHED CHARACTERISTIC

This article presents a compact dual band-notched UWB antenna with a pair of L-shaped and modifled L-shaped slots on either side of the ground plane for the 3.5/5.5GHz dual band-notched characteristics. The radiating patch of the proposed antenna has a ladderlike structure symmetrically and fed by a 50-› microstrip transmission line. By etching two sets of L-shaped slots on the ground plane, dual band-notched properties in the WiMAX/WLAN bands are achieved, respectively. The proposed antenna has the promising performance including matched impedance, consistent radiation pattern and stable gain.