Polarization Reconfigurable Slot Antenna With a Novel Compact CPW-to-Slotline Transition for WLAN Application

Abstract

of WLAN applications. A parametric study is implemented to investigate the characteristic of the proposed antenna. Two dominant parameters that determine the antenna's performance are discussed, and the simulated curves are given. The antenna not only has good impedance matching properties, but also the advantages of simple structure, small size, and low cost. All results demonstrate that the proposed antenna is of great use for WLAN applications. REFERENCES 1. J. Janapsatya, K.P. Esselle, and T.S. Bird, A dual-band and wideband planar inverted-F antenna for WLAN applications, Microwave Opt Technol Lett 50 (2008), 138-141. 2. D.-U. Sim and J.-Jck Choi, A compact wideband modified planar inverted F antenna (PIFA) for 2.4/5-GHz WLAN applications, IEEE Antennas Wirel Propag Lett 5 (2006), 391-394. 3. X.L. Bao and M.J. Ammann, Microstrip-fed dual-frequency annular-slot antenna loaded by split-ring-slot, IET Microwaves Antennas Propag 3 (2009), 757-764. 4. C.-M. Wu, Dual-band CPW-fed cross-slot monopole antenna forABSTRACT: This article present a development of low phase noise 14bit digitally controlled oscillator (DCO) based on ring oscillator with quadrature output in 0.18-lm CMOS technology. Proposed design use digital control and feed-forward technique to obtain wider output swing and stable quadrature output on even number of stages respectively. Designed DCO has tuning frequency range from 212 MHz to 1 GHz. Phase noise at 1-MHz frequency offset is À123.93 dBc/Hz, which is the lowest among the recently published result.

Dual-Band Reconfigurable Antenna for Polarization Diversity

“…As a result, the antenna can switch between four LPs at 45°intervals. In [9], a reconfigurable slot antenna that switches between the vertical and horizontal LPs was proposed. Two PIN diodes were applied to the CPW-toslotline transition to control the direction of the electric field that formed in the feed structure.…”

A Polarization Diversity Patch Antenna with a Reconfigurable Feeding Network

“…However, this approach requires a large amount of space. A reconfigurable antenna with polarization diversity has an advantage of creating two or more polarizations using only one resonator [3][4][5][6]. In [3], four diodes were used for polarization diversity.…”

“…In [4], a polarization reconfigurable slot antenna was proposed where the vertical and horizontal linear polarizations were controlled by two PIN diodes. Nevertheless, an inherent bidirectional radiation generally occurs in slot antennas, which is undesirable in wireless communication applications [5].…”

Reconfigurable Patch Antennas With Four-Polarization States Agility Using Dual Feed Ports

“…A square slot antenna can change between two linear polarization (LP) states by controlling the feed structure [4]. Generally, circular polarization (CP) operations are preferred in most applications.…”