Dual Band Bandpass Filter Using Meandered Ring Resonator

Dual Band Bandpass Filter Using Meandered Ring Resonator Dual band bandpass filter using Meandered ring resonator using loaded DGS Mariselvam V, Raju S Abstract Compact microstrip dual-band bandpass filter (DBBPF) with high selectivity and good suppression for wireless local area networks (WLANs) is proposed utilizing a novel embedded scheme resonator loaded ring resonator DGS. Two passbands are produced by a pair of embedded half-wavelength meandered stepped-impedance resonator (MSIR) and a quad wavelength short stub loaded stepped-impedance resonator (SIR) separately. The loaded DGS avoids the cross talk in the pass band which is useful to achieve very sharp cutoff in the pass band. The resonator is fed by folded T Shaped capacitive source-load coupling microstrip feed line, and four transmission zeros are obtained at both sides of the bands to improve selectivity and suppression. Simultaneously, the size of the filter is extremely compact because embedding half-wavelength MSIR only changes the interior configuration of quad-wavelength SIR. To validate the design method, the designed filter is fabricated and measured. Both simulated and me asured results indicate that good transmission property has been achieved. Keywords:  Low-pass filter, spurious rejection, linear phase, ring resonators, microstrip filters microwave filters. 1. Introduction BPFs are important block in RF front-to-end and have drawn much attention since they can reject the useless signals. In [1–3], miniaturized BPFs with high selectivity and enhanced out-of-band performance are designed for wireless communication systems. In recent years, with the development of different wireless standards, such as global system for mobile communication (GSM), wireless local-area network (WLAN) and world interoperability for microwave access (WiMAX), designing multi-band BPFs with miniaturized size, high selectivity and controllable frequencies has become a trend. In [4–6], compact and high selectivity dual-band BPFs are designed by two sets of resonators, stepped-impedance resonators (SIR) and stub-loaded resonators, respectively. For dual-band BPF designs, various approaches have been studied. A simple effective method is to utilize two or three sets of resonators [7–10]. In [7], a high selectivity dual-band BPF is designed by using coupled stepp ed impedance resonators. Each set of resonators operates at a pass band, resulting in controllable frequencies. Unfortunately, it has large size due to the multi-sets of resonators. In this a novel Meandered stepped impedance resonator with loaded DGS is utilized to achieve the desired dual pass band and the size is reduced. The two passbands are generated through respective resonators. High selectivity is obtained by the introduction of several finite attenuation poles in stopband. Compared with the conventional dual band filter, the filter is smaller in size and better in performance. 2. Analysis of stepped impedance resonator To design a DBBPF using SIRs, the properties of SIR must be analyzed first. As shown in Fig. 1, the basic structure of half-wavelength SIR consists of two lines of different characteristic impedances Z1 and Z2 and electrical lengths ÃŽ ¸1 and ÃŽ ¸2. It can be treated as two uniform cells (cell A and cell B). The resonance conditions can be obtained from one of them since the half-wavelength SIR is symmetrical [10]. The impedance of the resonator can be calculated as expression According to the above equation, the resonance appears when Zin is infinite, namely the denominator is equal to zero. As a result, the following expression can be obtained as the resonance condition Where Rz is the impedance ratio. In expression (2), we can see that the resonance conditions are determined by ÃŽ ¸1, ÃŽ ¸2 and Rz. It can adjust these three factors to obtain the resonance that we required, and a dual mode filter can be designed by using SIR. Fig. 1.Basic structure of the half wave length SIR (3) à Ã‚ ´s1 is the electrical length for the first spurious frequency fs1 .In this paper is to design a good WLAN filter, the first spurious frequency must be avoided at the designed lower passband. 3. Design of DBBPF Fig. 2 shows the transformation process to design an embedded-scheme resonator for DBBPF. In Fig.2 (a) a quad-wavelength short stub loaded SIR is shown. To reduce its size, the SIR is folded as an open-loop. Additionally, the low impedance lines of quad-wavelength short stub loaded SIR are broad enough to provide area for a small resonator, which make it possible to embed a pair of small coupling resonators. So, we replace the low impedance lines with a pair of meandered SIRs, which is shown in Fig. 2(b). To achieve a high performance dual-band filter, it is necessary to introduce transmission zeros at both sides of the bands. Due to the existence of DGS, magnetic coupling takes up dominant position on the short stub loaded SIR shown in Fig. 2(a). On the other hand, as the embedded MSIR is folded as an open-loop, it has the maximum electric field density at the side with an open gap, and the maximum magnetic field density at the opposite side. If the sides with the maximum magnetic f ield of two coupled resonators are proximately placed, the magnetic coupling can be obtained. Therefore, the coupling between the half wavelength SIR loops is also magnetic [15]. So, transmission zeros near the two pass bands can be generated by feeding microstrip feed line with capacitive source-load coupling, which because the counteraction between electric field and magnetic field. These transmission zeros have permits to improve selectivity and suppression of this filter. (b) Fig. 2.Embedded Resonator DBBPF design scheme. A filter proposed for WLAN is shown in Fig. 4.A set of parameters of it is given in Tab.1. 4. Filter Configuration Fig.3.T shaped stub loaded resonator Fig. 2 shows the configuration of the proposed micro strip dual-band BPF. It is composed of two sets of resonators. The outer resonators are stub-loaded resonators operating at the first and two pass band frequencies, i.e., 3.68 GHz and 7.01 GHz. Fig.3 illustrate the configuration of the resonator. It consists of a transmission line of length and a T-shaped stub loaded at the line centre is the overall length of the lines, namely L. L= B1+2d1+2f1+2C2+s1+2f1 Open-circuited coupled-lines with the length C2and gap C1 are employed to realize electrical coupling. Two transmission lines with the characteristic impedance of 50à ¢Ã¢â‚¬Å¾Ã‚ ¦ are connected to the outer resonators, acting as input and output ports. Embedded between the two outer resonators, the inner resonators 2 and3 are used to yield the second pass band at f2. The inner resonators are fed by the outer ones. Using this structure, multi-path coupling can be realized for the pass band, which can help generate a pair of transmission zeros. (a) (b) Fig. 4. Schematic view of the proposed filter (a) Top view (b) Bottom view 5. CSRR DGS UNIT The Ring Resonator structures are designed and produced by applying the Babinet principle to the split ring resonators (SRR). In this way structures with apertures in metal surface are obtained and these CSRRs create negative ÃŽ µ instead of negative ÃŽ ¼ in a narrow range near the resonance frequency. In microstrip technology, left handed Metamaterial structures exhibiting band stop behaviour can be implemented by etching CSRRs in the ground plane, underneath the conductor strip, and along the series capacitive gaps. The gap provides a negative value of the effective permeability up to certain frequency that depends on gap dimensions and separation. The negative ÃŽ µ structure has been obtained by loading a microstrip line with CSRR particles as shown in Fig.4. There are many different parameters that affect resonance frequency of CSRR, most dominant being the permittivity of the substrate and length of the resonator. The resonance frequency is inversely proportional to the length o f the resonator and is directly proportional to the split gap of the resonator. It is considered that the CSRR particle is etched only in the ground plane. CSRR etching depth decides the strength of the resonance increases [12]-[13] In order to improve the sharper cut-off, compact in size and harmonic suppression ability of the conventional dual band pass filter a CSRR is loaded in the bottom of the filter. The CSRR is designed at the anti-resonance frequency. Inherent nature of anti-resonance behaviour, it rejects the frequencies above cut-off frequency. In this way we achieved sharp cut-off.the dimensions of the ring resonator is given in Table.1. 6. Simulated and measured results To validate the characteristics, the proposed dual band filter is fabricated and measured in a FR4 substrate with a relative dielectric constant 4.4 a thickness of 1.6mm has been used in this paper. 50 ohms microstrip feed line with a width of 2.2mm is located at both of the input and output ports.fig 6 shows the photograph of the fabricated dual band filter. Fig.7. depicts the simulated and measured results of the proposed filter simultaneously. Here CST microwave studio is used for simulation and an Agilent network analyser N5230A is used for measurement. The simulated / measured minimum insertion losses are 0.65/0.985dB respectively at 3.684GHz band and 0.98/1.35dB respectively at 7.01 GHz. The size of the proposed layout is 14.5mmX19.9mm. (a) (b) Fig.6. Photograph of the Prototype of dual- band filter (a) top view (b) bottom view (a) (b) Fig.7. Simulated and measured (a) S11 (b) S21 of the proposed filter Tab. 1.  Parameters of the proposed filter Tab. 2.  Comparison of the proposed filter IL-insertion loss FBW- Fractional Band width 7. Conclusion In this paper, a dual band filter designed by embedded resonator loaded with ring resonator DGS was presented. A t-shaped embedded resonator with capacitive source –load coupling is used for feeding and multiple transmission zeros are created and DGS ring resonator is loaded to improve the performance of the filter. A good quality dual band Bandpass filter operating at 3.684 GHz and 6.83GHz for WLAN is well designed and fabricated .The size of the filter is 14.5X19.9mm which is very small. References JUN, S., K. CHANG., Compact microstrip bandpass filter using miniaturized hairpin resonator. Progress in Electromagnetics Research, PIER 2013, vol. 37, pp. 65–71. DAI, G.L., M.Y. XIA., Novel miniaturized bandpass filters using spiral-shaped resonators and window feed structures. Progress In Electromagnetics Research, PIER 2010, vol. 100, pp. 235–243. WEI. X., P. WANG, AND Y. SHI. M., Compact mixed-cross coupled bandpass filter with enhanced frequency selectivity. Progress In Electromagnetics Research, PIER 2013, vol. 37, pp. 73–82. CHAUDHARY, G., Y. JEONG, J. LIM., Dual-band bandpass filter with independently tuneable center frequencies and bandwidths IEEE Trans. Microw. Theory Tech., 2013, Vol. 61, pp. 107–116. ZHANG, R. AND L. ZHU, Design of a compact dual-band bandpass filter using coupled stepped impedance resonators. IEEE Microw. Wireless. Compon. Lett., 2014, vol. 24, No. 3, pp. 155–157. GAO, L. X. Y. ZHANG, High selectivity dual-band bandpass filter using a quad-mode resonator with source-load coupling. IEEE Microw. Wireless. Compon. Lett. 2013, vol. 23, No. 9, pp. 474–476. ZHANG, S., L. ZHU. Compact tri-band bandpass filter based on ÃŽ »/4 resonators with U-folded coupled-line. IEEE Microw. Wireless. Compon. Lett, 2013, vol. 23, No. 5, pp. 258–260. CHEN, F., C. Q. X. CHU, Design of compact tri-band bandpass filters using assembled resonators. IEEE Trans. Microw. Theory Tech., 2009, Vol. 57, pp. 165–171 XU, K., Y. ZHANG, D. LI, Y. FAN, J. L.-W. LI, W. T. JOINE, AND Q. H.LIU, Novel design of a compact triple-band bandpass filter using short stub-loaded SIRs and embedded SIRs structure. Progress In Electromagnetics Research, PIER 2013, vol. 142, pp. 309–320. PENG, Y., L. ZHANG, Y. LENG, J. GUAN, A compact tri-band pass band filter based on three embedded bending stub resonators. Progress In Electromagnetics Research, PIER 2013, vol. 37, pp. 189–197. RUNQIZHANG, LEIZHU. Y, Design of a compact dual band band pass filter using coupled stepped – impedance resonators. IEEE Micro. Wireless. Compon. Lett, 2014, vol.24, No.3 pp.155-157. RUNQIZHANG, LEIZHU, Synthesis and Design of Wideband Dual-Band Bandpass Filters With Controllable In-Band Ripple Factor and Dual Band Isolation IEEE Trans. Microw. Theory Tech., 2013, Vol. 61, pp. 1820–1828. KARUPPIAH ANNARAM, SURESH NITHYA. Investigation of Compact Low Pass Filter with Sharp Cut–Off using Metamaterial. RADIOENGINEERING, 2013, VOL. 22, NO. 3. BAENA, J. D., BONACHE, J., MARTIN, F., SILLERO, R. M. Equivalent circuit models for split ring resonators, and complementary split ring resonators coupled to planar transmission lines. IEEE Transaction on Microwave Theory and Techniques,2005, vol. 53, no. 4, p. 1451-1461. B. F. ZONG, G. M. WANG, H. Y. ZENG, Y. W. WANG. Compact and High Performance Dual-band Bandpass Filter using Resonator-embedded Scheme for WLANs. RADIOENGINEERING, 2012, VOL. 21, NO. 4.

Porter Diamond Automotive Market China

Automotive market in CHINA China’s domestic car sales, growing at more than 10% annually, these growing sales were in the domestic market and did not improve China’s competitiveness in the global auto industry. The rise of China as a Automotive car producer has lead to better roads, new distribution channels, the deregulation of the auto market, and China’s WTO entry. The multinational automotive companies invest in China for several reasons they try to find lower production costs, increase their market share in that specific areas while increasing their efficiency while operating and producing.In the early stages of China’s economic development, many foreign firms invested in China for cheap material and labor costs, as well as low worker unionization rate and environmental standards. Thus, most of China’s exports come out of miscellaneous manufacturing and labor-intensive industries. The central government has increased investment in basic infrast ructure development in order to remove the bottleneck effect caused by low infrastructure conditions and to increase energy productivity, transportation quality and communication ability.Although China’s auto firms have few competitive advantages comparing to leading global companies in terms of technological and managerial skills, China is still the largest potential demand market in the world. predicted that China’s average income will increase at an annual rate of 6% by 2011. Currently, for every 100 families in Beijing, 12 own private vehicles. While this number is insignificant compared with developed nations. Currently the country’s per capita GDP is low by international standards, and the majority of Chinese families are preoccupied with issues such as housing, medical care, and education.Many auto firms is the asymmetric distribution of China’s population and income. Competition in major cities has been accelerated in almost all market segments. D uring that period, in China, the supply chain underwent a major transformation. Multinational part suppliers began to work closely with local suppliers, in response to growing pressure from global auto assemblers. Meanwhile, Chinese domestic carmakers tried to improve their research capacity and economy of scale by standardizing local supply network. The first and most obvious strength is low production costs.Secondly, available production facilities build a solid infrastructure for parts manufacture and technological upgrading. Major auto assemblers invested heavily in the emerging markets, increasing production capacity and modernizing existing plants. They are attracted not only by the sales growth prospects offered by low motorization rates in developing nations, but also by the potential cost reduction that may be obtained through integrating low cost manufacturing locations and spreading the vehicle development costs across a greater number of markets.In China, the government promotes the development of large business groups in the auto sector so as to concentrate foreign investment and help build up competitive Chinese automakers. Finally a shared supplier network can help improve the suppliers’ economy of scale while promoting global quality standards and reducing the cost of vehicle manufacturing.

Slavery in “Adventures of Huckleberry Finn” by Mark Twain Essay

Mark Twain had direct experience with the slavery that he described in Adventures of Huckleberry Finn. When Mark Twain in 1884 / 1885 wrote his Adventures of Huckleberry Finn, describing a series of Mississippi river-town adventures experienced by a white boy, he created his novel in slavery time Missouri. During his writing, many influences prompted the author to examine the contemporary conditions of the black (Champion 54). From the novel the reader gathers a deep understanding of the meaning of living in a slave society in the period when slave trade was brisk. The person who reads Adventures of Huckleberry Finn does not come upon the discussion of slavery until Chapter Two, when Mark Twain describes how Huck and Tom spend their lives in a slaveholding society. The opening chapters contain what can be described as Tom Sawyer’s total experiences that make up his life. In these chapters the reader is led to see these circumstances and society as Tom Sawyer does. As a result, the slave Jim is illustrated mainly as a character to laugh at and play jokes and tricks on, and slavery is introduced as a normal and logical phenomenon. From this perspective, Jim is naive and disposed to believe in superstition – a humorous story character rather than a human being with ability to feel deeply and have thoughts and ideas. As Huck and Jim go beyond the social world of Tom Sawyer and have a good time alone together on the bank of the river, Jim begins to cast off the comic characteristics. It is as if Mark Twain begins portraying Jim through Huck’s observation rather than Tom’s observation. As Huck increasingly considers Jim as a more and more complex person with ideas and the conscious mind, Jim is described to the reader as less of a person who is comic. Jim’s deep human world is described in particular in his harrowing sense of deep regret over striking his deaf daughter, his statement that Huck is his only true friend, his feeling of happiness at discovering Huck alive after the loss in the fog, and the preaching he gives Huck for playing the last joke on him.  When Tom Sawyer once more appears in the scene in the Phelps situations, however, Jim again is pictured as if reflection of the powerful consciousness of Tom Sawyer; in the end Jim is again a character to laugh at, an o bject used for humorous purposes. The circumstances that lead up to describe Jim in slavery continue to be set in Chapter Four, as Huck, being an outsider in this system of human organizations almost like Jim, goes to Jim for advice about his future when he has suspicion that Pap may have come back. In contrast to the views having a high state of culture and social development that Tom Sawyer gets from books, Huck and Jim are alike in depending on folk knowledge, irrational beliefs that are given little credibility in this cultured civilization. The decisive scene that sets the stage for an escape from slavery is Pap’s long angry speech against the political authority and black folk in Chapter Six. Pap, in all his lack of knowledge and meanness, rails against free black human beings who are courageous enough to try to dress in a white shirt, can communicate in several languages, and are teachers in a college. This statement, uttered by a man who is extremely unpleasant, sadistic, overwhelmed by strong negative emotion, proud of his ignorance, and decided that his son will remain unable to read and write, is the reader’s first hint that Mark Twain’s sympathies are not with the slaveholding civilized classes. The signs that the reader’s sympathy is directed to Jim rather than to the society that enslaved him come into view early in the novel in the common characteristics between Jim and Huck. The reader observes here a parallel thematic progress in the destiny of the white boy and the black man, both of whom are casting off shackles that restrict their freedom. As Jim, the black man presented as possession by a human society, breaks free from confinements of slavery, so Huck, the white boy who has always been a vagabond, breaks free from confinements of his own enslavement in the roughly built hut. Moreover, both Huck and Jim are escaping from the same woman, Miss Watson. And both make their escape simultaneously. The emotional  attachment between the runaway boy and the runaway slave is born instantly as they join their forces for common freedom. The scene when they meet with each other on Jackson’s Island gives rise to uneasiness that comes again and again to the mind of Huck throughout the story, one he never resolves in his thoughts: tension between the values of civilization instilled by forceful and insistent repetition – the law, the legalized moral standards of the slaveholding social organizations (the fairness of which he never puts to question) – and his natural intuition to communicate with Jim kindly as with a close friend. The voice that says him to do what societal norms require, more exactly, to turn Jim in, is the voice he calls his sense of right that governs his thoughts and actions. To the end of the novel, he sees his desire to defend Jim from trouble as his own state of being weak – the attitude that makes him make decision, at last, that he can never be well-mannered and civilized. This inner conflict is seed when Jim and Huck first meet with each other on Jackson’s Island. When Jim, in all likelihood for his own safety, somewhat in hesitation explains that he has escaped from the control of Miss Watson, Huck really experiences surprise that Jim has broken the rules of society. But Huck, who has already earlier broken the law himself, has assured Jim that he would not tell anyone, even, he said, if â€Å"people would call me a low down Abolitionist† (50). Every family with which Huck is familiar seems to possess slaves. Not only Miss Watson had slaves, but the Grangerfords, the Wilkses, and the Phelpses too. Well, you see, it ‘uz dis way. Ole missus – dat’s Miss Watson – she pecks on me all de time, en treats me pooty rough, but she awluz said she wouldn’ sell me down to Orleans. But I noticed dey wuz a nigger trader roun’ de place considable lately, en I begin to git oneasy. Well, one night I creeps to de do’ pooty late, en de do’ warn’t quite shet, en I hear old missus tell de widder she gwyne to sell me down to Orleans, but she didn’ want to, but she could git eight hund’d dollars for me, en it ‘uz sich a big stack o’ money she couldn’ resis’. De widder she try to git her to say she wouldn’t do it, but I never waited to hear de res’. I lit out mighty quick, I tell  you (50). Jim’s statement that explains why he ran away, as well as Huck’s discussion about the abolitionists puts the novel in the historical developments of its time. At that time people had the view of the slave as property; accidentally separated members of slave families; slave traders did not consider slaves as human beings. The slave owners often had uncertain financial situation, which often led them to treat their â€Å"property† brutally. Slave feared to be sold further south – to New Orleans – to become a property of a new master and work on a large plantation. Abolitionists who made efforts to end slavery were disliked intensely by citizens in general. Slaves had the unceasing hope that he or she would some day be able to run away and make money sufficient to redeem the members of his or her family. All these historical elements became the driving themes of the novel. Being familiar with the episodes of life in slavery, Mark Twain shows that Jim’s desire to run away has three factors: he is separated from his family; he becomes aware of Miss Watson’s intentions to sell him down south; and he is full of resolution to buy the separated members of his family and make them free. In the case if masters of his family members refuse to sell them , then , Jim claims , he will ask for the help of abolitionists The clash between morality, legality and region, especially as it about slavery and property, is seen throughout all of Adventures of Huckleberry Finn. The idea that one person can really own another, human body and spirit, is given strength to not only by the legal rules governing society and the state, but by the practices and doctrines of the church as well. Slavery became a firm way of life and had a substantive effect on the fundamental values, manners, and a way of living of the nation. WORKS CITED _The Critical Response to Mark Twain’s Huckleberry Finn_, Ed. Laurie Champion (New York: Greenwood Press, 1991),65. _The Adventures of Huckleberry Finn_, Mark Twain. P. F. Collier & Son Company: New York, 1918.

The Short Story Of Marionettes, Inc. And The Murderer

â€Å"Ray Bradbury was an American fantasy and horror author who rejected being categorized as a science fiction author, claiming that his work was based on the fantastical and unreal† ( Ray Bradbury Biography.com). Ray Bradbury was unlike any other writer, he took science fiction and made it a real genre in literature. The short stories â€Å"Marionettes, Inc. and â€Å"The Murderer† are just two of the many pieces he published. â€Å"Marionettes, Inc.† is a short story on two men, Braling and Smith, who are having problems in their marriages and try to solve them through the use of robots (technology). This turned out to be an awful idea because Brailing Two (the robot) takes over Braling’s life and locks him up in the basement and Smith finds out that his†¦show more content†¦Similarly, the short story â€Å"Marionettes, Inc.† states â€Å"Nettie!, Nettie! He cried. â€Å"What’ve you done with my money!† And then, the horrid thought. And then the terror and loneliness engulfed him. And then the fever and disillusionment. For, without desiring to do so, he bent forward and yet forward again until his fevered ear was resting firmly and irrevocably upon her round pink bosom. â€Å"Nettie!† he cried. Tick, tick, tick, tick, tick, tick, tick, tick, tick, tick, tick† (Bradbury 218). Ray Bradbury repeats the word â€Å"tick† (onomatopoeia) to reveal that Smith’s wife is actually a robot. The dictions â€Å"terror†, â€Å"loneliness† and â€Å"horrid† prove that Smith was surprised and quite terrified to find out that his wife was in fact a robot. Therefore, Ray Bradbury builds a unique voice in the short stories â€Å"Marionettes, Inc. and â€Å"The Murderer† through diction and figurative language. Furthermore, Ray Bradbury creates a unique voice in the short stories â€Å"Marionettes, Inc.† and â€Å"The Murderer† through setting. The short story â€Å"The Murderer† states â€Å"Music moved with him in the white halls. He passed an office door. â€Å"The Merry Widow Waltz† Another door: Afternoon of a Faun. A Third: â€Å"Kiss Me Again.† He turned into a cross-corridor. â€Å"The Swan Dance† buried him in cymbals, drums, pots, pans, knives, forks, thunder, and tin lighting. All Sojan 3 washed away as he hurried through an anteroom where a secretary