A compact multiband antenna using λ/4 rectangular stub loaded with metamaterial for IEEE 802.11N and IEEE 802.16E

Wireless local area network (WLAN) is a technology that combines computer network with wireless communication technology. The 2.4 GHz and 5 GHz frequency bands in the Industrial Scientific Medical (ISM) band can be used in the WLAN environment. Because of the development of wireless communication technology and the use of the frequency bands without the need for authorization, the application of WLAN is becoming more and more extensive. As the key part of the WLAN system, the antenna must also be adapted to the development of WLAN communication technology. This paper designs two new dual-frequency microstrip antennas with the use of electromagnetic simulation software—High Frequency Structure Simulator (HFSS). The two antennas adopt ordinary FR4 material as a dielectric substrate, with the advantages of low cost and small size. The first antenna adopts microstrip line feeding, and the antenna radiation patch is composed of a folded T-shaped radiating dipole which reduces the antenna size, and two symmetrical rectangular patches located on both sides of the T-shaped radiating patch. The second antenna is a microstrip patch antenna fed by coaxial line, and the size of the antenna is diminished by opening a stepped groove on the two edges of the patch and a folded slot inside the patch. Simulation experiments prove that the two designed antennas have a higher gain and a favourable transmission characteristic in the working frequency range, which is in accordance with the requirements of WLAN communication.

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Design of Miniaturized Dual-Band Microstrip Antenna for WLAN Application

A new simple design of a triple-band microstrip antenna using metamaterial concept is presented in this paper. Multi-unit cell was the key of the multi resonance response that was obtained by etching two circular and one rectangular split ring resonator (SRR) unit cells in the ground plane of a conventional patch operating at 3.56 GHz. The circular unit cells are resonating at 5.6 GHz for the upper band of Wi-MAX, while the rectangular cell is designed to produce a resonance at 2.45 GHz for the lower band of WLAN. WiMAX's/WLAN's operating bands are covered by the triple resonances which are achieved by the proposed antenna with quite enhanced performance. A detailed parametric study of the placement for the metamaterial unit cells is introduced and the most suitable positions are chosen to be the place of the unit cells for enhanced performance. A good consistency between simulation and measurement confirms the ability of the proposed antenna to achieve an improved gain at the three different frequencies.

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Complementary Split Ring Resonator Based Triple Band Microstrip Antenna for WLAN/WiMAX Applications

In this letter, a substrate-integrated suspended line high-efficiency monopole antenna designed for 2.4/5.2 GHz wireless local area network (WLAN) application is proposed. The proposed antenna is composed of five stacked substrate layers with two embedded air cavities. Compared with the conventional monopole antennas, more metal surfaces of the proposed antenna can be used for radiation and impedance matching, which provides more flexibility for multiband antenna design. By utilizing the embedded air cavities, the loss of the whole structure is significantly decreased, thus efficiency of higher than 95% is achieved. Moreover, the stable omnidirectional radiation patterns are obtained in the two operating frequency bands of 2.25–2.90 and 4.95–5.94 GHz, which cover corresponding WLAN operation frequency bands.

Dual-Band Monopole Antenna Using Substrate-Integrated Suspended Line Technology for WLAN Application

In this article, a compact and planar wearable ultra-wideband (UWB) antenna is designed and characterised for wireless body area network (WBAN) applications. The antenna is designed and fabricated on two different substrates: a thin and flexible high-end RT/Duroid 5880 substrate (h = 0.381 mm) and a low-end FR4 substrate (h = 1.6 mm) having fabricated antenna dimensions of 86 mm × 72 mm and 75 mm × 61 mm, respectively. The dimensions of the proposed design for both the substrates are calculated using the well-known transmission-line model. The antennas are simulated using ADS momentum and CST microwave studio for evaluation of work using two different modelling techniques. The antenna structure consists of a rectangular radiating patch with a rectangular slot and a reduced ground plane to improve the impedance matching characteristics. An offset-feed method is employed to enhance the overall patch bandwidth. The measured −10 dB impedance bandwidth and gain with the RT/Duroid 5880 and FR4 substrates are 7.1 GHz (3.5–10.6 GHz)/4.89 dBi and 7.2 GHz (3.8–11 GHz)/2.75 dBi, respectively. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1710–1715, 2016

A wearable ultra‐wideband antenna for wireless body area networks

A compact dual-band rectangular microstrip antenna (RMSA) is realized by two different single-slotted single-band rectangular microstrip antennas with slotted ground plane. Each open-ended slot in the single-slotted antenna is responsible to generate a wide impedance band that is shifted to lower frequencies by the effect of the ground slot. The length and position of each open-ended slot is varied to operate the antenna in a suitable resonant band (5.15-5.35 and 5.725-5.825 GHz). The proposed antenna meets the required impedance bandwidth, necessary for dual-band IEEE 802.11a WLAN application (5.125-5.395 and 5.725-5.985 GHz). The dimension of the antenna (12 × 8 × 1.5875 mm3) shows an average compactness of about 53.73% with respect to a conventional unslotted rectangular microstrip patch antenna.

Compact Dual-Band Microstrip Antenna for IEEE 802.11a WLAN Application

A single-layer coaxial-fed compact rectangular microstrip antenna with very low voltage standing wave ratio (VSWR) is presented in this paper. The simulated VSWR of the proposed antenna 1.00374 is obtained near the center frequency of the operating band (3.5 GHz). Simulation and measurement results indicate that the bandwidth (simulated: 3.36–3.715 GHz, and measured: 3.295–3.645 GHz) of the antenna exceeds 10% below VSWR 2, when the size reduction of the antenna is about 81.6%. The realized peak gain is obtained about 2.15 dBi at 3.5 GHz. For the verification of the computational results, two designs were fabricated and measured. Good agreements between simulated and measured results were found.

Design of a compact wide band microstrip antenna with very low VSWR for WiMAX applications

A compact triple frequency microstrip antenna for WLAN/WiMAX applications is presented in this work. The proposed antenna consists of a rectangular microstrip patch embedded with an inverted L-shaped open ended slot and a ground plane with horizontal H shaped and rectangular slots. The designed antenna operates over the frequency ranges 2.30–2.751, 3.199–3.816, 5.06–6.15 GHz necessary for 2.4/5.2/5.8 GHz WLAN and 2.3/2.5/3.5/5.5 GHz WiMAX applications. Maximum size reduction of the proposed antenna obtained is about 83.17%. Good agreement is achieved between simulated and measured results. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2125–2129, 2015

Design of compact triple frequency microstrip antenna for WLAN/WiMAX applications

This paper presents a single-layer co-axial fed compact rectangular microstrip antenna for 2.4/5.2/5.8 GHz WLAN applications. The antenna consists of four rectangular and one triangular slot inside the patch and one rectangular open-ended slot inside the ground plane. Measured impedance bandwidths (2.36–2.485 and 5.14–6.43 GHz) show that the antenna is suitable for the applications in WLAN IEEE 802.11b/g and IEEE 802.11a bands.

Design of compact dual-band co-axially fed microstrip antenna for 2.4/5.2/5.8 GHz WLAN applications

This paper presents an approach to reduce the mutual coupling (MC) between two H-shaped patches in a probe fed multi-input multi-output (MIMO) antenna. The antenna covers the frequency spectrum from 3.46 to 3.69 GHz with an impedance bandwidth of 6.5%. The proposed antenna is incorporated with a modified EBG structure as an isolator to increase the port isolation. The isolator reduces mutual coupling of about 30.5 dB between the two ports. The antenna offers very low envelope correlation coefficient (ECC < 0.0023) and provides a good radiation pattern in E- and H-plane.

Aparna Kundu

Papers

Compact Dual-Band Microstrip Antenna for IEEE 802.11a WLAN Application

Design of a compact wide band microstrip antenna with very low VSWR for WiMAX applications

Design of compact triple frequency microstrip antenna for WLAN/WiMAX applications

Design of compact dual-band co-axially fed microstrip antenna for 2.4/5.2/5.8 GHz WLAN applications

Isolator-Based Mutual Coupling Reduction of H-Shaped Patches in MIMO Antenna Applications