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A Research of Bandpass Filter with Miniaturization and High Performance Based on Stripline Configuration

刘毅, 戴永胜
Applied Physics (APP) , 2016, DOI: 10.12677/APP.2016.61002
随着科技的不断进步,现代通信技术对设备的要求愈来愈高,对于微波滤波器这一重要的射频元器件在小型化与高性能方面的要求也越来越严格。而基于LTCC技术的带状线型微波滤波器正好满足了这些需求,逐渐成为了微波元器件研究的热点之一。本文实现了一种基于LTCC技术的小型化高性能带状线滤波器设计的实现方法,工艺上采取的LTCC技术大大缩小了滤波器的尺寸。借助电路仿真并在电磁场三维仿真软件上进行优化,实物测试结果与仿真结果很好的吻合,中心频率为2800 MHz,带宽为200 MHz,在2600 MHz频率上的衰减优于33 dB,在3020 MHz频率上的衰减优于25 dB,尺寸仅为4.8 mm × 4.2 mm × 1.5 mm。
With the continuous progress of technology, modern communication technology has increasingly demand for high-level equipment; the situation of the microwave filter as one of the essential components in microwave module is the same case. Multilayer microwave filter which is based on the LTCC technology meets these requirements and is becoming one of the hot research fields. A method for the section of stripline configuration bandpass filter with miniaturization and high performance is proposed. In order to ensure its miniaturization, this filter is based on the LTCC technology which is advance in the world. Using the circuit simulation and 3D simulation software to optimize and simulate, the measured results of the filter satisfy its performance requirement. The centre frequency of the BPF is at 2800 MHz and its bandwidth is 200 MHz; at 2600 MHz the stop-band attenuation needs to be more than 33 dB and at 3020 MHz is more than 20 dB. Its size of the fabricated filter is only 4.8 mm × 4.2 mm × 1.5 mm.
Highly Selective Suspended Stripline Dual-Mode Filter
B. A. Belyaev;Aleksandr A. Leksikov;A. M. Serzhantov;Vladimir V. Tyurnev
PIER Letters , 2011, DOI: 10.2528/PIERL11053001
Abstract: Miniature bandpass filter constructions based on a novel dual-mode suspended stripline resonator are proposed. Because of a special structure of the resonator, the frequencies of two first oscillation modes may be brought closer together. That allows realizing narrowband filters with the wide upper stopband. The filters have low insertion loss in the passband at small dimensions. Several transmission zeros substantially improve the filter performance. The derived coupling coefficients account for some features in the frequency response of the filter. The second-order and fourth-order filters with transmission zeros have been fabricated and measured.
Miniature Suspended-Substrate Bandpass Filter
B. A. Belyaev;Aleksandr A. Leksikov;A. M. Serzhantov;Vladimir V. Tyurnev
PIER C , 2010, DOI: 10.2528/PIERC10070604
Abstract: A new quasi-lumped suspended-substrate stripline structure admitting implementation of miniature highly selective narrowband filters is studied. Appreciable improvement of the device selectivity is achieved with supplementary strip conductors introduced between the resonators, which induce attenuation poles near both passband edges. Furthermore, these supplementary conductors reducing the coupling between the resona-tors allow diminishing the inter-resonator spacing and the total size. A four-resonator filter is synthesized using the intelligence optimization method. Experimental results of the manufactured filter are presented.
Quasi-Lumped Design of UWB BPF Using Suspended Stripline
Xian-Jie Liao;Min-Hua Ho;Wei-Hong Hsu;Wei-Qin Xu;Li-Jing Lin
PIER Letters , 2009, DOI: 10.2528/PIERL09080601
Abstract: We propose a novel UWB bandpass filter (BPF) design using the suspended stripline (SSL). The filter composes of a lowpass and a high-pass circuit, both implemented by SSL structures. A notch response structure might be implemented to the filter by embedding a resonant slotline. The quasi-lumped elements circuit models were developed to analyze these circuits' performance. Experiments were conducted, and good agreements were observed between the measurements and simulations.
Suspended Substrate Stripline Bandpass Filters with Source-Load Coupling Structure Using Lumped and Full-Wave Mixed Approach
Min-Hua Ho;Po-Fan Chen
PIER , 2012, DOI: 10.2528/PIER11102502
Abstract: This paper presents the design of two suspended substrate stripline (SSS) bandpass filters (BPFs), both with a source-load coupling structure embedded to create a transmission zero (TZ) near each side of the passband edges. For the first BPF, the physical circuit layout is proposed first and followed by the establishment of an equivalent LC circuit. The optimization of element values of the LC circuit using a circuit-level simulator leads to quick adjustment of the structural parameters of the physical circuit layout with the aid of a full-wave simulator. For the second BPF, the ingenious equivalent LC circuit modified from that of the first one is proposed for bandwidth enhancement, which is achieved by exciting two extra loaded resonances in the passband. With the element values of the LC circuit optimized, proper reshaping the physical circuit layout from that of the first BPF is easily accomplished. The presented lumped and full-wave mixed approach is very efficient in that the circuit-level simulator is used to the largest extent and the time-consuming full-wave simulator is employed only at the later stage of the design. Experiments are conducted to verify the design of the two SSS BPFs and agreements are observed between the measured and simulated data.
A Novel Compact Suspended Double Side Cmrc Millimeter Bandpass Filter with Wide Stopband
Xiao-Fan Yang;Yong Fan;Bo Zhang;Minghua Zhao
PIER Letters , 2011, DOI: 10.2528/PIERL11011603
Abstract: This paper presents a novel compact suspended double side millimeter bandpass filter (BPF) with wide stopband using Suspended Compact Microstrip Resonant Cell (SCMRC). For SCMRC exhibit slow-wave band-stop characteristics, two distributed SCMRC structures are designed to achieve wide stopband characteristic. By apply SCMRC structure and double side design, this novel BPF is size reduced. Back-to-back rectangular waveguide to suspended microstrip probe transitions at different millimeter bands are designed and fabricated to verify transmission characteristics of novel SCMRC bandpass filter. Experimental results show low insertion loss (< 1.2 dB) in the passband and sharp, wide rejection in the stopband with about 150% bandwidth (below -15 dB, from 50 GHz to 100 GHz), make good agreement with simulated results.
Miniaturization Design of Full Differential Bandpass Filter with Coupled Resonators Using Embedded Passive Device Technology
Sung-Mao Wu;Chun-Ting Kuo;Pei-Yu Lyu;Yu Li Shen;Ching-I Chien
PIER , 2011, DOI: 10.2528/PIER11091404
Abstract: This paper presents two full differential bandpass filters with small occupied areas. Both filters are designed with the same basic structure which consists of two double coupled resonators with magnetic coupling. The resonators are stacked up and have the advantage of high coupling efficiency, reducing the area. Nevertheless, in the basic structure, the insertion loss in the high stopband is above -10 dB and therefore does not meet the requirement for bandpass filter design. Thus, two solutions are introduced to form the proposed filters. The first one integrates the ground plane, while the second one makes the use of an extra transmission zero. With the help of these solutions, two types of full differential bandpass filters are implemented on an FR4 using the embedded passive device technology, with the additional purpose of being designed for SiP applications. The passband of the filters conforms to the WLAN IEEE 802.11a (5 GHz) standard. Most importantly, the occupied areas of the two proposed bandpass filters are only 6 mm х 6.7 mm and 6.6 mm х 8.3 mm respectively. Compared with previous research, area reductions of up to 98.05% and 97.76% can be achieved.
A Miniaturized Bandpass Filter with Controllable Harmonic by Using Split Impedance Resonators
Jian-Yi Li;Wen-Jeng Lin;Ding-Bing Lin;Lih-Shan Chen;Mau-Phon Houng
PIER C , 2010, DOI: 10.2528/PIERC10052306
Abstract: In this paper, a miniaturized bandpass filter with controllable harmonic by using split impedance resonators is proposed. The proposed split impedance resonator is based on the theories of the basic parallel impedance formula and stepped impedance resonators (SIRs). In this way, the split impedance resonator can be effectively designed to obtain good coupling for reducing the insertion loss. Furthermore, a miniaturized bandpass filter with controllable spurious frequency is proposed. The proposed bandpass filter not only has good passband characteristics but also obtains miniaturization around 21.87% versus the traditional SIR bandpass filters.
Novel Compact Dual-Band Bandpass Microstrip Filter
Subash Vegesna;Mohammad A. Saed
PIER B , 2010, DOI: 10.2528/PIERB10012210
Abstract: In this paper, a novel microstrip structure is developed to realize a dual-band bandpass filter. The proposed bandpass structure uses a microstrip resonator with two independently controlled resonance frequencies producing two frequency bands of interest controlled by adjusting the dimensions of the resonator. Parametric analysis is performed on the structure to determine the optimum dimensions to obtain the desired frequency response and is explained in the paper. The dual-band bandpass filter developed in this paper exhibits dual operating frequencies at 1390 MHz and 2520 MHz with 9.85% and 9.92% fractional bandwidths respectively. We achieved a compact second-order dual-band bandpass filter with controllable resonance frequencies and low insertion losses in the passband with high selectivity. The measured results are in good agreement with simulated results. Additionally, it can be easily fabricated and can be used in applications where miniaturization and compatibility with microstrip technology are of primary concern.
Triangular Resonator Bandpass Filter with Tunable Operation
Jian-Kang Xiao
PIER Letters , 2008, DOI: 10.2528/PIERL08010606
Abstract: Triangular patch resonator bandpass filters with tunable operation are developed to perform nicer filter properties of low passband insertion loss, transmission zeros and wide stopband. With tunable fractal-shaped defection acts as perturbation, filter operation frequency and operation band can be controlled, and the responses of undesired resonant modes are greatly weakened even suppressed. The new design can bring filters more operation without changing the dielectric substrate or patch size. The designed filters have outstanding advantages of single patch with compact size and without resonator coupling gaps, simple circuit topology, nicer performances, miniaturization and can be easily tuned for more applications. All these features are well popular for wireless communication systems.
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