Dual-band Printed Monopole Antenna Research Articles

A frequency reconfigurable high‐order mode monopole antenna with two independently controlled band

A dual-band printed monopole antenna with frequency-independent reconfiguration is proposed. Two varactor diodes are placed at the zero point of the current distribution in the third- and fifth-order modes of the traditional monopole radiator. By separately regulating the reverse bias voltage of the two varactor diodes, the corresponding two frequency bands can be controlled independently. A fully functional prototype is fabricated and characterized, which exhibits a continuously dual frequency-tunable characteristic. The designed antenna has a simple structure and compact size of 98 × 40 mm2. The antenna can be used in multi radio wireless systems, which has a good potential for use in cognitive radio.

Investigation of dual-band antenna with low-SAR characteristics for bidirectional brain-machine interface applications

In this paper, we propose an innovative dual-band printed monopole antenna (PMA) for bidirectional brain-machine interface (Bi-BMI) application. The proposed antenna configuration contains of a square radiator with a pair of rectangular slots and an inverted U-shaped slot and a truncated ground plane with a pair of L-shaped slots, which provides two usable radiating bands for down-link data transferring around 2.3–2.5 GHz and for up-link data transferring 3.21–9.03 GHz. By inserting two rectangular slots surrounded by a modified inverted U-shaped slot with modified dimensions on the radiating square patch and also by cutting two L-shaped slots, new resonances are created and therefore much wider impedance bandwidth can be generated at both lower and higher bands. Despite recently reported antenna designs in the literature, the proposed antenna demonstrates wideband radiative characteristics even at higher frequencies, and also the specific absorption rate (SAR) level in 1 mW input power case is satisfactory less than 0.4 W/kg in the whole radiating band. The designed antenna has a compact configuration and small size. Simulated and measured S-parameter and radiation patterns results are demonstrated to confirm the utility of the designed antenna configuration for brain machine interface application.

Dual-Band Printed Monopole Antenna Design

Design procedure of a high gain dual-band printed monopole antenna, resonating at 2.4 GHz and 5.5 GHz, is presented. The proposed design meets the specifications required by WI-FI, WIMAX and radio frequency identification (RFID) reader applications. Our design utilizes Rogers RT/Duroid 5880(tm) substrate, and the major radiation element is an annular circular patch shape. The design was improved by adding a face-to-face fork shape metal inside the annular circular patch. The antenna feed consists of a microstrip line and a slotted transformer section for matching purpose. A prototype of the proposed antenna was fabricated and the measurements of the return loss and antenna radiation pattern were performed. The comparison between the results obtained from the simulation and the measurements showed an excellent agreement.

A new compact dual band printed monopole antenna using electromagnetic band gap structures

PurposeThe purpose of this paper is to present a new dual-band printed monopole antenna with a partial ground with two notched bands based on electromagnetic band gap (EBG) structures. A new type of EBG antenna with radiation patterns and antenna gains over the operating bands has been developed.Design/methodology/approachThe proposed antenna consists of a pair of EBG structures using a transmission line model. The proposed antenna is designed on an FR4 substrate with a thickness of 1 mm and permittivity (er) = 4.3.FindingsThe measured results show good dual-band operations with −10 dB impedance bandwidths of 9.1 and 36.2 per cent centered at 2.45 and 6.364 GHz, respectively, which covers the wireless local area network (WLAN) operating bands.Originality/valueA new type of EBG antenna with radiation patterns and antenna gains over the operating bands has been developed.

Folded meander line antenna for wireless M‐Bus in the VHF and UHF bands

The first dual-band printed monopole antenna for wireless M-Bus and M2M applications with operation in the VHF and lower UHF bands is presented. The antenna operates at 169 and 433 MHz. The miniaturisation of the proposed compact antenna is based on a double-sided meandering structure offering an easily controlled large frequency ratio. The antenna provides high total efficiency and gain in both bands. Measured and simulated results are reported.

Characteristic Comparison of U-Shaped Monopole and Complete Monopole Antenna.

A monopole antenna is a type of radio antenna formed by replacing one half of a dipole antenna with a ground plane at right-angles to the remaining half. Monopoles may be used from a few hundred KHz through several GHz in frequency and are commonly one-quarter of a wave length long, but may be shorter or longer. Monopole antennas exhibit high gain and improved efficiency in a surprisingly small package. Monopole antenna can be designed to exhibit wideband capabilities. The different available monopole antennas are dual band printed monopole antenna, cross-slot monopole antenna, U-shaped monopole antenna, triangular shaped monopole antenna and a wideband monopole antenna. This paper deals with the comparison obtained from the results such as return loss, VSWR, current distribution, and the radiation pattern of simple U-shaped and complete monopole antenna. Keywords- CPW, CST, FR4, LAN, WiMAX

Multiband Printed Monopole Antennas Loaded With OCSRRs for PANs and WLANs

Multiband printed monopole antennas loaded with open complementary split-ring resonators (OCSRRs) are presented. The OCSRRs, modeled as parallel LC resonant tanks, act as high-impedance elements at their resonance frequencies, and different effective λ/4 sections can be achieved in the monopole by placing them at proper locations. Thus, the first working frequency is related to the length of the monopole, while the additional bands are controlled by the resonance frequencies of the OCSRRs. Moreover, the proposed antennas present monopolar radiation characteristics at all the operation bands. Two prototypes are designed, manufactured and measured: 1) a single-loaded OCSRR dual-band printed monopole antenna covering the Bluetooth and IEEE 802.11a/b/g/n bands (2.40-2.48 and 5.15-5.80 GHz, respectively); and 2) a triband prototype based on the same design, but with an additional OCSRR designed to also cover the IEEE 802.11y frequency band (3.65-3.70 GHz). Both antennas are printed on a single-layer of a low-cost substrate, resulting in very compact designs.

Compact dual-band printed monopole antenna for WLAN application

A microstrip-fed dual-band antenna with omnidirectional radiation patterns in the azimuth plane is proposed. It can provide two separate impedance bandwidths of 0.25 GHz (2.3-2.55 GHz) and 0.85 GHz (5.1-5.95 GHz), so that it easily covers the required bandwidths for wireless local area network applications. The proposed antenna is composed of a rectangular monopole and a folded strip whose end is coupled to the monopole by a narrow gap. It occupies an area of only 6.5 times 14 mm when printed on an FR4 substrate with a thickness of 1.5 mm.