Asymmetric‐arm printed dipole antenna for wlan applications

Abstract

frequencies using equivalent circuit model and THz-TDS system. We found that the structure could be used as a bandpass filter with narrow transmission band and very sharp edges in the terahertz wave region. Because of the charming features of compact size, easy fabrication, flexibility, and low fabrication cost, the terahertz wave filter based on the structure have been attracted much attention, and which will be crucial in the implementation of future terahertz communications systems.ABSTRACT: A novel printed dipole antenna for wireless local area networks (WLAN) applications is presented in this article. The proposed antenna, characterized by dual-band, low cross-polarization, and smallsize, consists of two asymmetric tapered arms. A novel feed scheme is employed to realize a balanced feed. For validation, the antenna prototype is fabricated and measured. The performance of the antenna is verified and characterized in terms of return loss, radiation pattern, and gain. The simulated and measured results show good agreement. Details of the proposed antenna design and tested results are presented and discussed.ABSTRACT: This article presents a high efficiency current-mode class-D (CMCD) amplifier using a GaN high electron mobility transistor (HEMT) for class-S system-a digitally controlled by deltasigma modulation. To enhance a drain efficiency of CMCD amplifier, the chip-on-board (COB) technique, which can reduce the external parasitic components of the packaged transistor and allow fast switching operation at high frequencies by minimizing distortion of the pulse waveform, is adopted. A LC-resonance circuit with adequate Q values between each transistor and output matching network controls harmonic signal by using the lumped elements to extract pure fundamental frequency of the output signal. For a high efficiency pushpull operation of CMCD amplifier, low-loss rat-race baluns are integrated at input and output circuits. From the measured results for a continuous wave of 3.35 GHz, the CMCD amplifier using COB technique shows a maximum output power of 35.88 dBm and a maximum power gain of about 10 dB. Also, the proposed CMCD amplifier provides a high power-added-efficiency (PAE) of 63.1% and a drain efficiency of 76.3% at maximum output power. The drain efficiency is still remained over 70% in the frequency range of 200 MHz.

Compact Dual-Band Dipole Antenna with Asymmetric Arms for WLAN Applications

“…An asymmetry structure of printed dipole antenna with a double-sided and center-feed design for dual-band (2.4/5 GHz) WLAN applications was reported [2]. A printed dipole antenna consisted of two asymmetric tapered arms [3] and an asymmetric dipole composed of a meandered feed line connected to a rectangular radiating element and its asymmetric counterpart with C-shaped parasitic strip [4] were advanced. A rectangular and a circular radiating element acting as asymmetric arms of a dipole to cover 2.4/5.2/5.8 GHz WLAN bands was employed [5].…”

“…The double-sided configuration [2,5] may raise manufacturing difficulty and cost. The uniplanar asymmetric dipole [3] still occupied a large area (44 mm × 15 mm). The constitutions [4,6] were complex, which may curtail the radiating performance (lower gain value and higher crosspolarization level).…”

A study on the rectangular ring, open‐ended monopole antenna with a vertical strip for WLAN dual‐band operations

“…Various kinds of multiband antennas have been tested for WLAN applications, such as monopole antennas [1, 2], printed dipole [3, 4], and coplanar waveguide (CPW)‐fed antennas [5]. Recently, multiband antennas for WLAN applications have been developed [6–16]. In particular, several papers related to rectangular, ring‐shaped monopole antennas were proposed [17–20].…”

Rectangular Ring Open-Ended Monopole Antenna with Inverted L-Strip for WLAN Dual-Band Operations

“…As WLAN communication becomes more and more popular, the need for a printed monopole antenna designed with a low profile, light weight, flush mount, and simple structure increases. Recently, multiband antennas for WLAN applications have been reported [1][2][3][4][5][6][7][8][9][10][11][12][13]. In particular, a few papers have proposed rectangular ring shaped monopole antennas [14][15][16][17][18].…”