scholarly journals CASCADED SQUARE LOOP BANDPASS FILTER WITH TRANSMISSION ZEROS FOR LONG TERM EVOLUTION (LTE)

SINERGI ◽  
2018 ◽  
Vol 22 (1) ◽  
pp. 63
Author(s):  
Iis Andini ◽  
Dian Widi Astuti ◽  
Muslim Muslim
Keyword(s):  
Insertion Loss ◽  
Return Loss ◽  
Bandpass Filter ◽  
External Resonator ◽  
Transmission Zeros ◽  
Term Evolution ◽  
Compact Size ◽  
Measurement Results ◽  
Resonator Method

In this paper, we present a bandpass filter that passed frequency of 1.7 GHz – 1.8 GHz. It is applied for an uplink frequency in 4G 1800MHz. This filter is created by using substrate PCB TMM-10i and has a compact size of 42 mm x 42 mm. The compact size is also important besides selectivity. The selectivity is achieved by implementing cascade square loop resonator method which generated transmission zeros. Actually, transmission zeros are obtained from the coupled resonator. The bandpass filter is designed by adding an external resonator on each square of the resonator loop and a patch to the inside of the square loop resonator. The parameter performances are simulated by HFSS. The parameter performances for return loss value is 14.24 dB at frequency 1.75 GHz and insertion loss value is 0.65 dB at frequency 1.75 GHz. By using VNA Anritsu MS 2026A, prototype bandpass filter is measured. The measurement results for return loss value is 6.8 dB and insertion loss value is 2.2 dB.

scholarly journals Desain dan Implementasi Duplekser dengan Metoda Pseudo-Interdigital untuk Uplink dan Downlink LTE

2016 ◽  
Vol 13 (2) ◽  
pp. 73
Author(s):  
Enceng Sulaeman ◽  
Yaya Sulaeman ◽  
Asep Yudi Hercuadi
Keyword(s):  
Insertion Loss ◽  
Return Loss ◽  
Bandpass Filter ◽  
Long Term Evolution ◽  
Full Duplex ◽  
Frequency Division ◽  
Time Division Duplex ◽  
Term Evolution ◽  
Time Division

Duplekser merupakan perangkat yang dapat mengisolasi receiver dari transmitter saat keduanya saling berbagi antena yang sama, digunakan agar komunikasi bisa berjalan secara full duplex. Ada dua metode transmisi duplex yaitu frequency division duplex (FDD) dan time division duplex (TDD). FDD merupakan teknik duplex yang menggunakan dua frekuensi yang berbeda untuk melakukan komunikasi dalam dua arah, sedangkan TDD menggunakan frekuensi tunggal dan frekuensi tersebut digunakan oleh semua kanal untuk melakukan pengiriman dan penerimaan data. Gabungan dua bandpass filter dengan metoda pseudo-interdigital untuk aplikasi LTE (long term evolution). Metode ini lebih unggul dibandingkan duplekser dengan metoda hybrid. Duplekser bekerja pada FDD LTE band ke-7 yaitu frekuensi uplink 2500-2570 MHz dan downlink 2620-2690 MHz. Dari hasil pengukuran diperoleh sebagai berikut: nilai frekuensi center pada uplink 2639 MHz dan pada downlink 2659 MHz, insertion loss pada uplink 1,561 dB dan downlink 1,74 dB, bandwidth ±70 MHz, isolasi 23,03 dB, serta nilai return loss 23,5 dB pada uplink dan downlink 23,45 dB.

A Novel Planar Extended Doublet Filter with Substrate Integrated Waveguide Cavity Resonators

2013 ◽  
Vol 631-632 ◽  
pp. 962-966
Author(s):  
Kai Shen ◽  
Tao Li ◽  
Jing Jing Wang
Keyword(s):  
Insertion Loss ◽  
Return Loss ◽  
Bandpass Filter ◽  
Single Layer ◽  
Substrate Integrated Waveguide ◽  
Cavity Resonators ◽  
Transmission Zeros ◽  
Measurement Results ◽  
Negative Coupling ◽  
First Time

A novel planar extended doublet filter based on substrate Integrated waveguide cavity resonators was proposed for the first time. This filter consists of a main doublet with an additional resonator grown in one of the branches. The source and load are coupled to both branches of the doublet in order to generate two transmission zeros. By employing the combinational structure of the TE101-mode and TE102-mode of the SIW cavity resonators, the negative coupling coefficient required for the design of a single-layer cross-coupled SIW bandpass filter is implemented. The measurement results show the return loss of the implemented filter is above 13dB, the insertion loss is below 4.238dB with only 0.56% of the bandwidth.

Miniaturized Wideband Bandpass Filter based on Capacitor-loaded One-eighth Wavelength Coupled Line

2021 ◽  
Vol 36 (7) ◽  
pp. 865-871
Author(s):  
Jin Shi ◽  
Jiancheng Dong ◽  
Kai Xu ◽  
Lingyan Zhang
Keyword(s):  
Insertion Loss ◽  
Simple Structure ◽  
Bandpass Filter ◽  
State Of The Art ◽  
Center Frequency ◽  
Fractional Bandwidth ◽  
Coupled Line ◽  
Transmission Zeros ◽  
Compact Size ◽  
Multiple Transmission

A novel miniaturized wideband bandpass filter (BPF) using capacitor-loaded microstrip coupled line is proposed. The capacitors are loaded in parallel and series to the coupled line, which makes the filter just require one one-eighth wavelength coupled line and achieve filtering response with multiple transmission poles (TPs) and transmission zeros (TZs). Compared with the state-of-the-art microstrip wideband BPFs, the proposed filter has the advantages of compact size and simple structure. A prototype centered at 1.47 GHz with the 3-dB fractional bandwidth of 86.5% is demonstrated, which exhibits the compact size of 0.003λ2 g (λg is the guided wavelength at the center frequency) and the minimum insertion loss of 0.37 dB.

scholarly journals A Compact Dual-Mode Bandpass Filter with High Out-of-Band Suppression Using a Stub-Loaded Resonator Based on the GaAs IPD Process

Electronics ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 712 ◽  
Author(s):  
Wei Zhang ◽  
Zhao Yao ◽  
Jie Zhang ◽  
Eun Seong Kim ◽  
Nam Young Kim
Keyword(s):  
Insertion Loss ◽  
High Performance ◽  
Return Loss ◽  
Bandpass Filter ◽  
Open Loop ◽  
Fabrication Process ◽  
Dual Mode ◽  
Transmission Zeros ◽  
Semiconductor Fabrication ◽  
Device Size

In this letter, a compact dual-mode bandpass filter (BPF) with an ultra-wide stopband that employs two folded open-loop resonators (FOLRs) and stub-loaded resonators (SLRs) is proposed. The dual-mode resonators are optimized by loading two SLRs onto the folded open-loop resonators, and this process is analyzed using the dual-mode theory. To miniaturize the device size and increase chip performance, the proposed BPF is fabricated by a III–V compound semiconductor-fabrication process using a high-performance GaAs substrate based on the integration passivation device (IPD) fabrication process. A compact dual-mode BPF with low insertion loss and high return loss is designed and fabricated. Two extra transmission zeros (TZs) located in the high-frequency range increase the wide stopband, and the two TZs near the passband result in a higher selectivity. A resonant frequency centered at 7.45 GHz with an insertion loss of −1.21 dB and a measured return loss of higher than −23.53 dB and 3 dB fractional bandwidths of 5.8% are achieved. The stopband can be suppressed up to 20 GHz owing to the two tunable TZs resulting in higher selectivity and wideband rejection. The size of the filter was drastically optimized using a simplified architecture of two FOLRs and SLRs.

A Compact Lowpass Filter with Four Transmission Zeros Using Single-Sided Compact Microstrip Resonator Cells

2012 ◽  
Vol 487 ◽  
pp. 125-129
Author(s):  
Kai Yu Zhao ◽  
Lin Li
Keyword(s):  
Insertion Loss ◽  
Return Loss ◽  
Cutoff Frequency ◽  
Lowpass Filter ◽  
Sharp Transition ◽  
Microstrip Resonator ◽  
Broad Bandwidth ◽  
Transmission Zeros ◽  
Compact Size ◽  
Low Insertion Loss

A compact lowpass filter using two single-sided compact microstrip resonator cells （CMRCs）with low insertion loss and broad bandwidth is presented. The cutoff frequency is about 1.4 GHz, the insertion loss is less than 0.6 dB and the 20dB bandwidth is up to the range from 2.1 GHz to 9.8 GHz by means of introducing four transmission zeros through two CMRCs. In addition, the simulated results demonstrate that the proposed filter is characterized by a compact size, low insertion loss, sharp transition, low return loss and wide bandwidth.

Design of Novel Compact Quad-Band Bandpass Filter with High Selectivity

Frequenz ◽  
2020 ◽  
Vol 74 (1-2) ◽  
pp. 53-59
Author(s):  
Qingchun Cao ◽  
Hui Liu ◽  
Li Gao
Keyword(s):  
Return Loss ◽  
High Selectivity ◽  
Bandpass Filter ◽  
Center Frequency ◽  
Transmission Zeros ◽  
Compact Size ◽  
Left And Right ◽  
Embedded Structure ◽  
Better Than ◽  
Good Agreement

AbstractThis paper presents a compact quad-band bandpass filter. The filter is realized by multi-embedded stub-load resonators. By utilizing multi-embedded structure, the whole filter exhibits a compact size. And due to the multi-section stub-loaded lines, four passbands can be realized and the center frequency of the four passbands can be controlled individually to accommodate different communication protocols. Moreover, by using 0° degree feed structure, there are two transmission zeros locates at left and right side of a passband, which greatly enhance the selectivity. To validate the proposed idea, a quad-band bandpass filter, which operates at 2/2.7/3.45/4.55 GHz is implemented. The insertion loss is smaller than 2 dB and return loss is better than 10 dB. Good agreement between the predicted and measured results demonstrates the proposed idea.

scholarly journals A Bandpass Filter Using Half Mode SIW Structure with Step Impedance Resonator

Electronics ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 51
Author(s):  
Min-Hang Weng ◽  
Chin-Yi Tsai ◽  
De-Li Chen ◽  
Yi-Chun Chung ◽  
Ru-Yuan Yang
Keyword(s):  
Insertion Loss ◽  
Return Loss ◽  
Bandpass Filter ◽  
Filter Design ◽  
Design Concept ◽  
Center Frequency ◽  
Substrate Integrated Waveguide ◽  
Design Curve ◽  
Transmission Zeros ◽  
Measured Response

This paper presents a miniaturized bandpass filter, which uses half mode substrate integrated waveguide (HMSIW) structure with embedded step impedance structure (SIS). By embedding the stepped impedance structure into the top metal of the waveguide cavity, the center frequency can be quickly shifted to a lower frequency. The operating center frequency of the proposed bandpass filter (BPF) using HMSIW resonators with embedded SIS is tunable as functions of the parameters of the SIS. The design curve is provided. A filter example of the center frequency of the filter at 3.5 GHz is fabricated and measured, having the insertion loss |S21| less than 3 dB, and the return loss |S11| greater than 10 dB. The transmission zeros are located at 2.95 GHz and 3.95 GHz on both sides of the passband, both of which are lower than 30 dB. The simulation result and the measured response conform to the proposed design concept. The proposed HMSIW filter design is in line with the current 5G communication trend.

A New Compact Dual-Band Filter Using SIR

2012 ◽  
Vol 424-425 ◽  
pp. 573-576
Author(s):  
Jin Ping Hu ◽  
Guo Hui Li ◽  
Wei Dong Fang ◽  
Wei Zhang ◽  
Hai Ping Hu
Keyword(s):  
High Performance ◽  
Return Loss ◽  
Bandpass Filter ◽  
Dual Band ◽  
Fractional Bandwidth ◽  
Theoretical Simulation ◽  
Band Filter ◽  
Compact Size ◽  
Measurement Results ◽  
Simulation Results

A narrowband dual-band bandpass filter based on step impedance resonator (SIR) is proposed in this paper to realize high performance with a compact size. The center frequencies of the designed filter are 2.4 and 5.8GHz, where it is suitable for wireless communication system. The absolute bandwidth approaches 200MHz with 8.3% fractional bandwidth at -3dB, and the simulations show that the return loss of the first and the second band is lower than -20dB. Between the two passbands, there is a transmission zero which can achieve a high out-band isolation. For demonstration, the filter has been fabricated and the measurement results show the excellent agreement with the theoretical simulation results

Compact microstrip bandpass filter using dual closed-loop stepped impedance resonator

2018 ◽  
Vol 10 (4) ◽  
pp. 405-411 ◽  
Author(s):  
Salif N. Dembele ◽  
Ting Zhang ◽  
Jingfu Bao ◽  
Denis Bukuru
Keyword(s):  
Circuit Design ◽  
Return Loss ◽  
Closed Loop ◽  
Bandpass Filter ◽  
Center Frequency ◽  
Fractional Bandwidth ◽  
Transmission Zeros ◽  
Measurement Results ◽  
Frequency Position ◽  
Stepped Impedance Resonator

AbstractA dual closed-loop stepped impedance resonator (DCLSIR) is investigated and used in designing a compact microstrip bandpass filter (BPF). The proposed DCLSIR is symmetrical; as a result, the symmetric characteristics of the resonator have been used. The design equations are derived and used to support the circuit design. The center frequency, position of transmission zeros, and fractional bandwidth (FBW) are easily tuned by changing the physical dimensions of the resonator. Three transmission zeros are generated to improve the performance in the upper stopband. A DCLSIR prototype BPF is fabricated with a center frequency of 9.3 GHz, and evaluated to validate the design concept. The measured FBW is 9.25%, the insertion loss is 1.58 dB, and the return loss is over 17 dB. The measurement results agree well with the simulation results.

scholarly journals Rancang Bangun Band Pass Filter Frekuensi 1.27 GHz untuk Teknologi Synthetic Aperture Radar

2018 ◽  
Vol 5 (2) ◽  
pp. 149
Author(s):  
RIFAN FITRIANTO ◽  
YUYUN SITI ROHMAH ◽  
EFA MAYDHONA SAPUTRA
Keyword(s):  
Insertion Loss ◽  
Return Loss ◽  
Bandpass Filter ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Measurement Results ◽  
Epoxy Material ◽  
It Support ◽  
Band Pass ◽  
Aperture Radar

ABSTRAKSynthetic Apertur Radar (SAR) adalah teknologi radar yang digunakan untuk pengambilan gambar suatu objek dalam bentuk 2 atau 3 dimensi (penginderaan jarak jauh). Sistem tersebut  bekerja pada rentang frekuensi 1.265 sampai dengan 1.275 GHZ dengan frekuensi tengahnya 1.27 GHz. Agar sistem SAR ini dapat bekerja dengan optimal, dibutuhkan suatu perangkat filter yang dapat meloloskan frekuensi yang diinginkan. Sebelumnya sudah ada penelitian yang membuat perangkat ini di band frekuensi yang sama namun menggunakan bahan duroid 5880 dan resonator berbentuk kotak. Bandpass filter Pada penelitian ini dirancang dengan menggunakan metode Hairpin line dan bahan epoxy FR4. Hasil pengukuran menunjukkan nilai Return Loss masih cukup besar yaitu -9.33 dB dan nilai Insertion Loss minimal sebesar -13.51 dB.Kata kunci: Syntethic Aperture Radar, Band Pass Filter, Hairpin-lineABSTRACTSynthetic Aperture Radar (SAR) is a radar technology that used for taking an object in the form of 2 or 3 dimensions (remote sensing). It works in the frequency range 1.265 to 1.275 GHZ with a middle frequency of 1.27 GHz. SAR system can work optimally if it support a filter device that can pass the desired frequency. Previously there has been research that makes this device in the same frequency band but using 5885 duroid material and square resonator. Bandpass filter In this study designed using Hairpin line method and FR4 epoxy material. The measurement results of Return Loss values are still quite large  arround -9.33 dB and Insertion Loss minimum at -13.51 dB.Keywords: Syntethic Aperture Radar, Band Pass Filter, Hairpin line

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