Strip‐loaded CPW‐fed pentagonal antenna for GPS/WiMAX/WLAN applications

Abstract

In this article, we have proposed an accurate calibration method for measuring photodetector wideband response with optical heterodyne measurement technique. The experimental result ranging from 0 to 48.65 GHz indicates that the proposed calibration method can effectively remove the errors introduced by extra fixture as well as laser output fluctuations. Good agreement between the calibrated frequency response and the data provided by the manufacturer has been achieved. The proposed method can improve the accuracy for optical heterodyne measurement technique and reduce the requirements in both laser output stabilities and fixture frequency performance, which is suitable to characterize the photodetector frequency response in an ultrawide frequency range. REFERENCES

A coupling‐fed multiband antenna for WLAN/WiMAX applications

“…Among the many kinds of antenna structure, chip antennas are attractive for their small size and low profile and are very promising in mobile communication devices. To reduce the occupied dimension, meander line [1,2] and bended structure [3,4] technique were applied. For multi-band operation via a compact dimension, the parasitic capacitance/inductance [3,5] was introduced to lower resonant frequency, improve the impedance matching, or cause additional resonant modes.…”

“…Recently, wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) allow for convenient portable/mobile wireless access to various digital communication systems are becoming very attractive [1,2]. Antennas with the simple structure and superior radiation performance in characteristics of multiband operation for WLAN/WiMAX applications, good monopole-like pattern, and high gain have been increasing [3].…”

Compact self‐similar triple‐band antenna for WLAN/WiMAX applications

“…In Ref. 2, a printed antenna is designed for WLAN/WiMAX systems could obtain multiband characteristics. However, gain of the antenna is low at the operation band.…”

Dual-Wideband Symmetrical G-Shaped Slotted Monopole Antenna for Wlan/Wimax Applications

“…However, most of them are addressed to the needs of 2.4/5 GHz WLAN applications, antenna designs with a whole coverage of 2.5/3.5/5.5 GHz for WiMAX operation are scant. In [8][9][10][11][12][13][14], several sorts of dual-or multi-band antennas have been designed to meet the requirements of both WLAN and WiMAX applications. However, the antennas in [8] and [9] can only meet the 3.5/5.5 GHz WiMAX standard.…”

“…And in [12] the ground is large and the structure is complex by coupling a stub-loaded open-loop resonator on the back side of the monopole. The asymmetric structures applied in [13] (Γ-shaped and I-shaped slits) and [14] (trapezoidal ground plane and rectangular horizontal strips) make the radiation patterns poor omni-directional in the azimuthal plane.…”