Compact power divider with improved isolation and bandpass response

Abstract

This article presents a compact power divider with band‐pass response and improved isolation by using substrate integrated waveguide (SIW) and defected ground structure (DGS) techniques. The band‐pass response is realized by combining the high‐pass characteristic of SIW and low‐pass feature of DGS. In order to achieve improved isolation performance, a slot which is terminated by four resistors is etched on the top plane of the SIW to balance the three input/output ports. The size of the proposed power divider is relatively small because of the slow‐wave characteristic of DGS. To verify the proposed concept, a prototype power divider with equal power division is fabricated and measured. Measured results show that it has a 3‐dB pass‐band from 8 GHz to 10 GHz and the isolation is higher than 20 dB within the pass‐band.

A Compact SIW Power Divider for Dual-Band Applications

“…It is seen that the SIW power dividers in [9,10,23,24] provide slightly better isolation than the proposed prototypes due to the use of resistive elements in their design. The present prototypes achieve compact size and less insertion loss than reported SIW PDs [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Therefore the proposed SIW DBPD exhibits the advantages of smaller circuit-area, low insertion-loss and acceptable isolation beneficial for dual-band applications.…”

“…The SIW power divider becomes a key component at millimeter wave band and widely used in array antennas, multiplexers and power amplifiers (PAs). In recent years, the development of SIW power dividers with low insertion loss, broadband, miniaturization has been attracted many researchers [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. A high isolation SIW power divider based on the fixed width lines has been designed [8].…”

“…A compact power divider employing quarter-mode circular cavity has been designed to obtain filtering response [13]. A compact SIW power divider has been implemented applying defected ground structure (DGS) for improved isolation and bandpass response [14]. The T-junction SIW structure has been employed to design a PD with distinct power distribution [15].…”

A half‐mode substrate integrated waveguide filtering power divider with Fourier‐varying via holes

“…Substrate integrated waveguide (SIW) technology benefits from bulky waveguides in planar setups. Therefore, SIW were adopted in the design of power dividers at the mm‐wave band 1–14 . Ring‐shaped Wilkinson power divider (WPD) with several distributed resistors were proposed in References 1,2.…”

“…Nevertheless, such designs suffer from weak matching levels. Compact SIW power divider (PD) was designed using defected ground structure (DGS) 12 . In addition, SIW multi‐way dividers were proposed in References 13,14.…”