Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : dual

Miniaturized Dual-Band Bandstop Filter Using Multilayered E-Shape Microstrip Structure

Raaed T. Hammed

Engineering and Technology Journal, 2016, Volume 34, Issue 11, Pages 2096-2105

This paperpresents a new design technique to realize a miniaturized dual-band rejection filter based on the E-shape microstrip structure for multifunctional wireless communication systems. The filter is designed on a double layer substrate to achieve compact size. On the bottom layer, two E-shape microstrip structures are realized and coupled through a space gap,gc, to perform the specified dual-bandstop response. The filtering response of the two bandstops is improved using a top layer substrate employing a main linestub. The main line is a half wavelength hairpin resonator. These two filter circuits are capacitivley coupled using overlapping microstrip lines.To demonstrate the proposed design technique, a multi-band bandstop filter is developed with rejection frequenciesof 2.4 and 5.3 GHz Wireless local Area Network (WLAN). The filter is designed and simulated using the momentum simulator of theAdvanced Design System (ADS) software package. The resulting filter has two second-order bandstops with four transmission poles and provides two band rejectionsof 25 dB and 35 dB at 2.4 GHz and 5.3 GHz respectively. The filter circuit size is very small, being of the order of about 26 mm2 excluding the feeding ports.

Design of Compact Dual-band Antenna for 4G LTE Wireless Devices

Ali J. Salim

Engineering and Technology Journal, 2016, Volume 34, Issue 6, Pages 1194-1206

In this paper, the planar dual-band monopole antenna is presented for Long Term Evolution (LTE) and Wireless Local Area Network (WLAN) applications. The design of the proposed antenna is based on Peano fractal curve and meander line structures. The antenna operates in 1.71 GHz to 2.01 GHz in the desired LTE frequency band and 5.0 GHz to 5.5GHz band (IEEE 802.11a band). The frequency band 1.71 - 2.01 GHz is already available as a study of the current plan according to UMTS and LTE systems (the band no.4). The antenna has been fixed on a substrate boardArlon with εr= 2.33 and thickness of 0.9 mm. Simulation results shows that the proposed antenna has promising radiation characteristics and a reasonable gain of 2.155 dBi at the lower band and 4.772 dBi at the upper band. The simulation and evaluation of antenna performance werecarried out using Microwave Studio Suite of Computer Simulation Technology CST.

A Novel Microstrip Dual-Mode Band-pass Filter For second Harmonic Suppression

Ali Abdul-Elah Noori

Engineering and Technology Journal, 2010, Volume 28, Issue 11, Pages 2206-2211

A novel design scheme has been introduced in this paper to suppress 2nd harmonic
from response of band-pass filter (BPF) which appears at about . The filter is
composed of perturbed, square-ring resonator and open end stup length where
wavelength for harmonic located on the output feeder port work as Band Stop
Filter. The harmonic suppression of the BPF may be realized by choosing a
proper length of the open stup which is equal to . The BPF investigated is for more
frequencies such as (GPS, ISM, RFID, and GSM).
The performance of BPFs with open stup structures has been analyzed using
method of moments (MoM) based software microwave office, which is widely
adopted in microwave research and industry.