Balun bandpass filter on slot-line resonators with intrinsic balanced performance in amplitude and phase

2018 ◽  
Vol 10 (8) ◽  
pp. 891-895 ◽  
Author(s):  
Lin-Ping Feng ◽  
Lei Zhu
Keyword(s):  
Bandpass Filter ◽  
Bandpass Filters ◽  
Wide Frequency Range ◽  
Frequency Selectivity ◽  
Good Frequency ◽  
Frequency Range ◽  
Third Order ◽  
Slot Line ◽  
Distinct Field

AbstractIn this paper, a novel class of balun bandpass filters is presented on slot-line resonator (SLR) toward intrinsic balanced performance in amplitude and phase. The proposed balun filter consists of three inductive-coupled SLRs in the middle, one single-ended unbalanced port, and one balanced port with two terminals. According to the distinct field conversion from the slotline to the microstrip feeding line, good balanced performance in amplitude, and phase performance can be intrinsically realized over a wide frequency range. To validate the proposed technique, a prototype third-order balun filter is designed, fabricated, and measured. Both the simulated and measured results have demonstrated that the proposed balun filter can not only achieve good frequency selectivity but also exhibit intrinsic balanced performance in amplitude and phase.

Design of multi-layered bandpass filter with independently controllable triple-passband response

2014 ◽  
Vol 6 (6) ◽  
pp. 611-618 ◽  
Author(s):  
Yung-Wei Chen ◽  
Hung-Wei Wu ◽  
Yan-Kuin Su
Keyword(s):  
Frequency Response ◽  
Bandpass Filter ◽  
Bottom Layer ◽  
Wide Frequency Range ◽  
Electromagnetic Simulation ◽  
Frequency Range ◽  
High Isolation ◽  
Full Wave ◽  
Simulation Results ◽  
Good Agreement

In this paper, a new multi-layered triple-passband bandpass filter using embedded and stub-loaded stepped impedance resonators (SIRs) is proposed. The filter is designed to have triple-passband at 1.8, 2.4, and 3.5 GHz. The 1st and 2nd passbands (1.8/2.4 GHz) are simultaneously generated by controlling the impedance and length ratios of the embedded SIRs (on top layer). The 3rd passband (3.5 GHz) is generated by using the stub-loaded SIR (on bottom layer). Using the embedded SIR, the even modes can be tuned within very wide frequency range and without affecting the odd modes. Therefore, the design of multi-band filters with very close passbands can be easily achieved and having a high isolation between the passbands. The filter can provide the multi-path propagation to enhance the frequency response and achieving the compact circuit size. The measured results are in good agreement with the full-wave electromagnetic simulation results.

Design and Simulation of K Band RF MEMS Tunable Combline Filter

2014 ◽  
Vol 875-877 ◽  
pp. 2219-2223 ◽  
Author(s):  
Zhong Liang Deng ◽  
Xing Jie Cao
Keyword(s):  
Mobile Communication ◽  
Communication Systems ◽  
Bandpass Filter ◽  
Rf Mems ◽  
Bandpass Filters ◽  
Simulation Software ◽  
Frequency Range ◽  
Mobile Communication Systems ◽  
Simulation Results ◽  
Tunable Frequency

Tunable bandpass filters are generally preferred and are used extensively in the mobile communication systems. In this paper, a design of the RF MEMS tunable combline bandpass filter is proposed. Firstly, the theory of the RF MEMS tunable combline bandpass filter is presented. Secondly, a combline bandpass filter which have a tunable frequency range from 18GHz to 27GHz is designed and simulated by using the EDA simulation software. Its bandwidth is about 1GHz in the tunable frequency range. From the simulation results, the designed filter is not only compact and effortless to fabricate but also relatively superior in some aspects.

scholarly journals On Minimal Second-order IIR Bandpass Filters with Constrained Poles and Zeros

2021 ◽  
Vol 53 (4) ◽  
pp. 210401
Author(s):  
Endra Joelianto
Keyword(s):  
Impulse Response ◽  
Bandpass Filter ◽  
Bandpass Filters ◽  
Second Order ◽  
Infinite Impulse Response ◽  
Frequency Range ◽  
Notch Filters ◽  
Filter Structure ◽  
Poles And Zeros ◽  
The Relationship

In this paper, several forms of infinite impulse response (IIR) bandpass filters with constrained poles and zeros are presented and compared. The comparison includes the filter structure, the frequency ranges and a number of controlled parameters that affect computational efforts. Using the relationship between bandpass and notch filters, the two presented filters were originally developed for notch filters. This paper also proposes a second-order IIR bandpass filter structure that constrains poles and zeros and can be used as a  minimal parameter adaptive digital second-order filter. The proposed filter has a wider frequency range and more flexibility in the range values of the adaptation parameters.

scholarly journals Designing a Microstrip coupled line bandpass filter

2013 ◽  
Vol 2 (4) ◽  
pp. 266 ◽  
Author(s):  
Taoufik Ragani ◽  
N. Amar Touhami ◽  
M. Agoutane
Keyword(s):  
Wireless Communication ◽  
Significant Role ◽  
Communication Systems ◽  
Bandpass Filter ◽  
Bandpass Filters ◽  
Center Frequency ◽  
Wireless Communication Systems ◽  
Frequency Range ◽  
Wide Bandwidth ◽  
Coupled Line

Bandpass filters play a significant role in wireless communication systems. Transmitted and received signals have to be filtered at a certain center frequency with a specific bandwidth, in this paper, a coupled-line bandpass Filter at the center frequency 6 GHz with the wide bandwidth of 2 GHz. this type of filter can be used in WLAN and other applications for the frequency range of 5-7 GHz.

Ultra-Wideband Bandpass Filter Based on a Multi-Stub Loaded Loop Resonator

2019 ◽  
Vol 28 (13) ◽  
pp. 1920008
Author(s):  
Xiaodong Xie ◽  
Zhizhan Yang ◽  
Mingxing Deng
Keyword(s):  
Return Loss ◽  
Group Delay ◽  
Bandpass Filter ◽  
Frequency Selectivity ◽  
Ultra Wideband ◽  
Frequency Range ◽  
Transmission Zeros ◽  
Resonant Modes ◽  
Delay Variation

A multi-stub loaded loop resonator (MSLLR) is proposed in this paper, which exhibits five main resonant modes of interest. Then, an ultra-wideband (UWB) bandpass filter is developed on it. Through direct source/load coupling, two transmission zeros can be created at both sides of the passband of the filter, which improves its frequency selectivity. The measured results of the fabricated filter show that its bandwidth can cover the UWB frequency range and the return loss in the passband is greater than 12.9[Formula: see text]dB. Frequency selectivity is improved due to two transmission zeros at both sides of the passband. Group delay variation is less than 0.48[Formula: see text]ns in the passband, which is relatively flat.

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