Super broadband lumped models for embedded passives

IEEE Trans. Microwave Theory Techn.

2006

Abstract-A single-stage equivalent circuit is proposed to model microwave bandpass filters (BPFs) fabricated in low-temperature co-fired ceramic (LTCC) technology up to several times its passband frequency. The equivalent circuit adopts a modified T topology with the expandable multilayer resonators to achieve an extremely large bandwidth. It can be efficiently established from the measured -parameters using direct extraction or rational approximation. As a result, the modeled -parameters for a 2.45-GHz wideband local area network (WLAN) LTCC BPF show good agreement with the measured results over a wide frequency range up to 8.5 GHz. Such a broadband model can be used to accurately predict the suppression of harmonics and interferences in system simulation of the WLAN front-end modules.Index Terms-Equivalent-circuit model, low-temperature co-fired ceramic (LTCC) bandpass filter (BPF), wideband local area network (WLAN) BPF.

Section: Evolution Of Bpf Prototypementioning

confidence: 99%

mentioning

confidence: 99%

A Broadband Single-Stage Equivalent Circuit for Modeling LTCC Bandpass Filters

Tsai

IEEE Trans. Microwave Theory Techn.

2006

“…It is based on an inductive coupling of series resonators with components suitable for the large-value spiral inductors in conjunction with the small-value parallel-plate capacitors. In our previous work [4], we have established the equivalent-circuit libraries for both types of passive components embedded in a 4-layer BT laminate substrate. When used to design the proposed bandpass filter in the 2.5-2.9 GHz WiMAX band, the typical component values are in the range of several nH for the spiral inductors and in the order of several tenths of pF for the parallel-plate capacitors.…”

Section: Introductionmentioning

confidence: 99%

Design of Miniature Bandpass Filters Embedded in the Organic Substrate for RF SOP Applications

Chiu

Lin

2006 European Microwave Conference

et al. 2006

Self Cite

Very small-size bandpass filters embedded in the organic substrate for RF System-On-Package (SOP) applications are presented. Due to the lack of fabrication process for largevalue capacitors in the organic substrate, a novel filter prototype using an inductive coupling of series resonators is proposed to achieve high performance within a stringent size constraint. In implementation, the organic bandpass filters are composed of the spiral inductors and parallel-plate capacitors that are embedded in a 4-layer BT laminate, one of today's most popular package substrate. The final realized performance and size are competitive to the LTCC filters but with a much lower cost.Index Terms -Organic filter, band-pass filter, RF system on package.

“…It is noted that the equivalent circuit for a spiral inductor adopts a widely used PI model that contains the main inductance and parasitic shunt capacitances. In addition, series and parallel resistances are both used to account for conductor and substrate losses [15]. For the parallel-plate capacitors, since they have quite small capacitance values, their self-resonant frequencies are far away from the measured frequency range.…”

Section: Equivalent Circuitmentioning

confidence: 99%

“…It is based on an inductive coupling of series resonators with components suitable for the large-value spiral inductors in conjunction with the small-value parallel-plate capacitors. In our previous works [15], [16], we have established the scalable model libraries for both types of passive components embedded in a 4-layer BT laminate substrate. When used to design the proposed bandpass filter in the 2.5-2.9 GHz WiMax band, the typical component values are in the range of several nH for the spiral inductors and in the order of several tenths of pF for the parallel-plate capacitors.…”

Section: Introductionmentioning

confidence: 99%

Design of Super-Miniature Bandpass Filters Embedded in the Organic Substrate without Using Large-Value Capacitors

Chiu

Lin

56th Electronic Components and Technology Conference 2006

et al.

Self Cite

Very small-size bandpass filters embedded in the organic substrate for wireless front-end applications are presented. Due to the lack of fabrication process for large-value capacitors in the organic substrate, a novel filter prototype using an inductive coupling of series resonators is proposed to achieve high performance within a stringent size constraint. In implementation, the organic bandpass filters are composed of the spiral inductors and parallel-plate capacitors that are embedded in a 4-layer BT laminate, one of today's most popular package substrate. The final realized performance and size are competitive to the LTCC filters but with a much lower cost. IntroductionThe currently available low-temperature cofired ceramic (LTCC) technology can implement high-performance miniature embedded filters quite successfully because of the capability to realize large-value capacitors in a large number of thin substrate layers. To fully employ this capability, most of the LTCC bandpass filter designs adopt a capacitive coupling of parallel resonators as a lumped-element prototype [1]- [3], which mainly uses the large-value vertically interdigitated capacitors in conjunction with the small-value meander-line inductors. However, in system-on-package applications, the LTCC technology has two major disadvantages that it has a high fabrication cost and also has a difficulty in dealing with the high-density interconnects. On the other hand, the currently most popular low-cost package substrate is an organic laminate on which the high-density interconnects as well as the high-Q embedded passives are feasible [4]- [8]. But it has only a limited number of layers and the layer thickness is not small enough for realizing largevalue capacitors. In our literature review, due to the lack of small-volume large-value capacitors, the previously designed bandpass filters embedded in the organic substrate [9]- [12] were inevitably big in size with moderate to high insertion losses in passband. Although a thin high-k dielectric buried in the organic substrate [13], [14] for realizing large-value capacitors is available nowadays, the cost is still too high.A new lumped-element design for the organic bandpass filters without using the large-value capacitors is proposed in this paper. It is based on an inductive coupling of series resonators with components suitable for the large-value spiral inductors in conjunction with the small-value parallel-plate capacitors. In our previous works [15], [16], we have established the scalable model libraries for both types of passive components embedded in a 4-layer BT laminate substrate. When used to design the proposed bandpass filter in the 2.5-2.9 GHz WiMax band, the typical component values are in the range of several nH for the spiral inductors and in