A novel differential filtering SIW power divider with high selectivity

In this article, a balanced filtering power divider (FPD) that allows for operational agility of the bandwidth (BW) is presented. The differential-mode power dividing and high common-mode (CM) suppression can be realized by microstrip-to-slotline transition. Two slotline open stubs with different lengths are added in shunt to the main slotline for the transition, which can not only introduce transmission poles for extending and controlling transition BW, but also generate two extra transmission zeros (TZs) near to the passband edges, featuring good filtering response. The two transmission poles can be independently tunable by loading varactors to the open ends of slotline stubs and two TZs will be changed accordingly so that the filtering passband BW is electrically tunable. To verify the theoretical prediction, a prototype of tunable balanced FPD is fabricated and measured. The measured results show that the 3-dB fractional bandwidth (FBW) of the passband varies from 5.6% to 12.6%, meaning more than a double tuning range for the FBW, and the CM suppression is better than 40 dB across the frequency band of interest. K E Y W O R D Sbalanced filtering power divider, bandwidth agility, common mode suppression, differential mode

Section: Introductionmentioning

confidence: 99%

A bandwidth‐agile balanced filtering power divider

Tan

et al. 2019

“…High performance, low cost, and high integration microwave components are in continuous demand for the rapid development of modern wireless communication. 1 To overcome the drawbacks of the conventional bulky waveguide and planar transmission lines, the concept of substrate integrated waveguide (SIW) has been reported and investigated since 2001. 2 It provides a low cost, low loss, high power-handling capability, self-shielded, and easy integration with planar circuits.…”

Section: Introductionmentioning

confidence: 99%

Ultracompact two‐way and four‐way SIW/HMSIW power dividers loaded by complementary split‐ring resonators

Moznebi

Danaeian

Zarezadeh

et al. 2019

In this paper, two ultracompact power dividers based on the substrate integrated waveguide (SIW) and half‐mode SIW (HMSIW) technologies loaded by complementary split‐ring resonators (CSRRs) are presented. The presented structures are designed based on the theory of evanescent mode propagation. To obtain a size reduction, the CSRR unit cells are etched on the metallic surface of the SIW and HMSIW structures. First, a two‐way HMSIW power divider is reported. In this circuit, the concept of HMSIW is utilized aiming at a further size reduction in addition to the size reduction by the CSRR unit cells. Then, a four‐way SIW power divider is designed so that the direct coaxial feed is used for the input port and microstrip transmission lines are used for the output ports. Both two‐way and four‐way SIW/HMSIW power dividers at 5.8 GHz covering WLAN are designed, fabricated, and measured. They respectively have 0.18 × 0.21 λg2 and 0.38 × 0.21 λg2 total size. A fair agreement between simulated and measured results is achieved. The measured insertion losses are 0.5 ± 0.5 and 0.6 ± 0.5 dB for the two‐way and four‐way SIW/HMSIW power dividers, respectively, in the operating band of interest.

“…Differential topology is widely applied in constructing microwave circuits and systems because of its high immunity to noise and crosstalk. Corresponding to this trend, many devices have been designed in differential configuration, such as power dividers, phase shifters, antennas, and filters . In earlier works, the differential bandpass filters (BPFs) have been extensively developed by using various technologies, such as the printed circuit board, the low temperature co‐fired ceramic, and the substrate integrated waveguide .…”

Section: Introductionmentioning

confidence: 99%

Compact differential dual‐band bandpass filter using single quad‐mode metal‐loaded dielectric resonator

Yuan

Zhou

2019

This letter presents a novel miniaturized differential dual‐band bandpass filter (BPF) using a single quad‐mode metal‐loaded dielectric resonator (DR). The differential dual‐band BPF is designed in a single‐cavity configuration with one quad‐mode DR and four feeding probes, featuring compact size. The rectangular DR is directly mounted on the bottom of the metal cavity and covered by a metal plate on the top surface. It allows two pairs of orthogonal modes (LSE10 and LSM10), which can be differentially excited and coupled by introducing proper perturbation for constructing dual‐band differential‐mode frequency response. To validate the proposed idea, a compact differential BPF with good performance using a quad‐mode DR cavity is designed, fabricated, and measured. The simulated and measured results with good agreement are presented.