Novel low-loss microstrip triplexer using coupled lines and step impedance cells for 4G and WiMAX applications

Abstract

Abstract:In this paper, a new microstrip triplexer with flexible resonance frequencies is designed based on the properties of coupled lines, steps, and spiral cells. It operates at 2.67 GHz for 4G LTE and at 3.1 GHz and 3.43 GHz for IEEE 802.16 WiMAX. The close resonance frequencies make it suitable for frequency division duplex applications. In order to improve insertion loss, the LC equivalent circuit of the proposed resonator is analyzed. Moreover, careful alignment of the coupled lines and step impedance structures is performed to improve the insertion and return losses so that they are 0.72/0.63/0.81 dB and 24.5/24/24.7 dB, respectively. The frequency response shows good selectivity for each channel.Meanwhile, there are several transmission zeros above the first channel and below the last one that improve the stopband properties. The proposed triplexer is fabricated and measured. The simulation and measurement results are in good agreement, which validates the introduced methodology.

Design and fabrication of a compact microstrip triplexer for wimax and wireless applications

“…The photograph of the fabricated diplexer and return losses from ports 1, 2 and 3 (S22, S33 and S44) are presented in Fig. 4c, [15,16] and [20,21], our diplexer has smaller size. Also, it is better than reported diplexers in [16,[20][21] in term of insertion losses.…”

“…Moreover, reasonable return losses and insertion losses are obtained at all pass bands. 2.4, 3.5, 5.8 6, 4.5, 3.6 0.9, 1.1, 1.3 ---870 0.119 [13] 0.9, 2.4, 5.5 ---0.7, 1.7, 1.5 --------- [14] 3.4, 3.9, 4.4 ---From 1.6 to 2.2 ---3180 --- [15] 2.67, 3.1, 3.43 ---0.72, 0.63, 0.71 24.5, 24, 24.7 ---0.137 [16] 2.4, 3.…”

“…In [14], a fully integrated triplexer with a large implementation area is proposed for multi-band ultra-wideband applications. A new microstrip triplexer is designed in [15] based on the properties of coupled lines, steps, and spiral cells to operate at 2.67 GHz for 4G LTE and at 3.1 GHz and 3.43 GHz for WiMAX. A microstrip triplexer with wide stop band is proposed in [16] using uniform impedance and common crossed resonators.…”

A Compact Microstrip Triplexer With a Novel Structure Using Patch and Spiral Cells for Wireless Communication Applications

“…Recently, compact and high-performance microstrip triplexers are highly attractive for multichannel wireless and mobile systems. Accordingly, several types of microstrip triplexers have been reported in [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Their designs are based on various types of microstrip resonators.…”

“…Their designs are based on various types of microstrip resonators. In [5], step impedance and two different types of spiral resonators have been utilised to achieve a triplexer. A common triple-mode resonator in [6], coupled open loops and hairpins in [7], step impedance resonator, radial and coupled lines in [8], two coupled bumpy lines in [9], and coupled hairpins and spirals in [10] have been used to design microstrip triplexers.…”