A multilayer substrate integrated filter using dual dielectric modes

AbstractIn this paper, a novel multilayer substrate integrated dual-mode dielectric resonator (DR) filter is proposed. The square dual-mode DR is made of the high permittivity substrate by removing the undesired portions and the surface coppers so that the relatively high unloaded quality factor of the dominate TM11 pair can be obtained which compared to these fully dielectric-filled substrate integrated waveguides. Meanwhile, it can be easily integrated in an equivalent cavity implemented by multilayer printed circuit boards for filter design, showcasing low in-band loss, light weight, and compact size. For demonstration, a multilayer substrate integrated DR bandpass filter centered at X-band is designed and measured. Good agreement between the simulated and measured results can be observed, and the measured insertion loss at the passband center frequency (8.38 GHz) is 1.1 dB.

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Compact dual-mode microstrip bandpass filter based on slotted square patch resonator

Microelectronics International ◽

10.1108/mi-08-2021-0080 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Karthie S. ◽

Zuvairiya Parveen J. ◽

Yogeshwari D. ◽

Venkadeshwari E.

Keyword(s):

Bandpass Filter ◽

Filter Design ◽

Center Frequency ◽

Dual Mode ◽

Content Type ◽

Transmission Zeros ◽

Compact Size ◽

Mode Response ◽

Better Than ◽

Good Agreement

Purpose The purpose of this paper is to present the design of a compact microstrip bandpass filter (BPF) in dual-mode configuration loaded with cross-loop and square ring slots on a square patch resonator for C-band applications. Design/methodology/approach In the proposed design, the dual-mode response for the filter is realized with two transmission zeros (TZs) by the insertion of a perturbation element at the diagonal corner of the square patch resonator with orthogonal feed lines. Such TZs at the edges of the passband result in better selectivity for the proposed BPF. Moreover, the cross-loop and square ring slots are etched on a square patch resonator to obtain a miniaturized BPF. Findings The proposed dual-mode microstrip filter fabricated in RT/duroid 6010 substrate using PCB technology has a measured minimum insertion loss of 1.8 dB and return loss better than 24.5 dB with a fractional bandwidth (FBW) of 6.9%. A compact size of 7.35 × 7.35 mm2 is achieved for the slotted patch resonator-based dual-mode BPF at the center frequency of 4.76 GHz. As compared with the conventional square patch resonator, a size reduction of 61% is achieved with the proposed slotted design. The feasibility of the filter design is confirmed by the good agreement between the measured and simulated responses. The performance of the proposed filter structure is compared with other dual-mode filter works. Originality/value In the proposed work, a compact dual-mode BPF is reported with slotted structures. The conventional square patch resonator is deployed with cross-loop and square ring slots to design a dual-mode filter with a square perturbation element at its diagonal corner. The proposed filter exhibits compact size and favorable performance compared to other dual-mode filter works reported in literature. The aforementioned design of the dual-mode BPF at 4.76 GHz is suitable for applications in the lower part of the C-band.

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Compact dual mode X-band SIW bandpass filter with wide spurious suppression using split square ring slot resonator

Circuit World ◽

10.1108/cw-08-2019-0094 ◽

2020 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Sandhya Ramalingam ◽

Umma Habiba Hyder Ali ◽

Sharmeela Chenniappan

Keyword(s):

Bandpass Filter ◽

Equivalent Circuit Model ◽

Circuit Board ◽

Center Frequency ◽

Design System ◽

Dual Mode ◽

Content Type ◽

X Band ◽

Compact Size ◽

Spurious Suppression

Purpose This paper aims to design a dual mode X-band substrate integrated waveguide (SIW) bandpass filter in the conventional SIW structure. A pair of back-to-back square and split ring resonator is introduced in the single-layer SIW bandpass filter. The various coupling configurations of SIW bandpass filter using split square ring slot resonator is designed to obtain dual resonant mode in the passband. It is shown that the measured results agree with the simulated results to meet compact size, lower the transmission coefficient, better reflection coefficient, sharp sideband rejection and minimal group delay. Design/methodology/approach A spurious suppression of wideband response is suppressed using an open stub in the transmission line. The width and length of the stub are tuned to suppress the wideband spurs in the stopband. The measured 3 dB bandwidth is from 8.76 to 14.24 GHz with a fractional bandwidth of 48.04% at a center frequency of 11.63 GHz, 12.59 GHz. The structure is analyzed using the equivalent circuit model, and the simulated analysis is based on an advanced design system software. Findings This paper discusses the characteristics of resonator below the waveguide cut-off frequency with their working principles and applications. Considering the difficulties in combining the resonators with a metallic waveguide, a new guided wave structure – the SIW is designed, which is synthesized on a planar substrate with linear periodic arrays of metallized via based on the printed circuit board. Originality/value This study has investigated the wave propagation problem of the SIW loaded by square ring slot-loaded resonator. The electric dipole nature of the resonator has been used to achieve a forward passband in a waveguide environment. The proposed filters have numerous advantages such as high-quality factor, low insertion loss, easy to integrate with the other planar circuits and, most importantly, compact size.

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A compact UWB antenna with triple band notch reconfigurability

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078720001580 ◽

2020 ◽

pp. 1-7

Author(s):

Lei Li ◽

Jingchang Nan ◽

Jing Liu ◽

Chengjian Tao

Keyword(s):

Coplanar Waveguide ◽

Ring Resonators ◽

Uwb Antenna ◽

Split Ring ◽

X Band ◽

Compact Size ◽

Nested Structure ◽

P Type ◽

Good Agreement ◽

Triple Band

Abstract A compact ultrawideband (UWB) antenna with reconfigurable triple band notch characteristics is proposed in this paper. The antenna consists of a coplanar waveguide-fed top-cut circular-shaped radiator with two etched C-shaped slots, a pair of split-ring resonators (SRRs) on the backside and four p-type intrinsic n-type (PIN) diodes integrated in the slots and SRRs. By controlling the current distribution in the slots and SRRs, the antenna can realize eight band notch states with independent switch ability, which allows UWB to coexist with 5G (3.3–4.4 GHz)/WiMAX (3.3–3.6 GHz), WLAN (5.15–5.825 GHz), and X-band (7.9–8.4 GHz) bands without interference. By utilizing a nested structure of C-shaped slots and SRRs on the backside, a compact size of 18 × 19.5 mm2 is achieved along with multimode triple band notch reconfigurability. The antenna covers a bandwidth of 3.1–10.6 GHz. A prototype is fabricated and tested. The simulated and experimental results are in good agreement.

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Novel Hexagonal Dual-Mode Substrate Integrated Waveguide Filter with Source-Load Coupling

The Scientific World JOURNAL ◽

10.1155/2014/915740 ◽

2014 ◽

Vol 2014 ◽

pp. 1-5

Author(s):

Ziqiang Xu ◽

Gen Zhang ◽

Hong Xia ◽

Meijuan Xu

Keyword(s):

Center Frequency ◽

Substrate Integrated Waveguide ◽

Fractional Bandwidth ◽

Dual Mode ◽

Transmission Zeros ◽

Cavity Structure ◽

Waveguide Filter ◽

And Performance ◽

Single Cavity ◽

Good Agreement

Hexagonal dual-mode cavity and its application to substrate integrated waveguide (SIW) filter are presented. The hexagonal SIW resonator which can combine flexibility of rectangular cavity and performance of circular cavity is convenient for dual-mode bandpass filters design. By introducing coupling between source and load, the filter not only has good selectivity due to two controllable transmission zeros, but also has a small size by the virtue of its single-cavity structure. A demonstration filter with a center frequency of 10 GHz and a 3 dB fractional bandwidth of 4% is designed and fabricated to validate the proposed structure. Measured results are in good agreement with simulated ones.

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A Two-Stage X-Band 20.7-dBm Power Amplifier in 40-nm CMOS Technology

Electronics ◽

10.3390/electronics9122198 ◽

2020 ◽

Vol 9 (12) ◽

pp. 2198

Author(s):

Zhichao Li ◽

Shiheng Yang ◽

Samuel B. S. Lee ◽

Kiat Seng Yeo

Keyword(s):

Output Power ◽

Effective Conductivity ◽

Building Blocks ◽

Cmos Technology ◽

Center Frequency ◽

Cmos Process ◽

Two Stage ◽

Power Added Efficiency ◽

X Band ◽

Compact Size

For higher integration density, X-band power amplifiers (PAs) with CMOS technology have been widely discussed in recent publications. However, with reduced power supply voltage and device size, it is a great challenge to design a compact PA with high output power and power-added efficiency (PAE). In the proposed design, a 40-nm standard CMOS process is used for higher integration with other RF building blocks, compared with other CMOS PA designs with larger process node. Transistor cells are designed with neutralization capacitors to increase stability and gain performance of the PA. As a trade-off among gain, output power, and PAE, the transistor cells in driving stage and power stage are biased for class A and class AB operation, respectively. Both transistor cells consist of two transistors working in differential mode. Furthermore, transformer-based matching networks (TMNs) are used to realize a two-stage X-band CMOS PA with compact size. The PA achieves an effective conductivity (EC) of 117.5, which is among the highest in recently reported X-band PAs in CMOS technology. The PA also attains a saturated output power (Psat) of 20.7 dBm, a peak PAE of 22.4%, and a gain of 25.6 dB at the center frequency of 10 GHz under a 1 V supply in 40-nm CMOS.

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Closed Loop Resonator Based Compact UWB Antenna with Single Notched Band Varying between WLAN and X-band for UWB Applications

Frequenz ◽

10.1515/freq-2019-0115 ◽

2020 ◽

Vol 74 (5-6) ◽

pp. 201-209

Author(s):

Mohammad Ahmad Salamin ◽

Sudipta Das ◽

Asmaa Zugari

Keyword(s):

Closed Loop ◽

Ground Plane ◽

Frequency Range ◽

Uwb Antenna ◽

Notched Band ◽

X Band ◽

Compact Size ◽

Simulation Results ◽

Uwb Applications ◽

Good Agreement

AbstractIn this paper, a novel compact UWB antenna with variable notched band characteristics for UWB applications is presented. The designed antenna primarily consists of an adjusted elliptical shaped metallic patch and a partial ground plane. The proposed antenna has a compact size of only 17 × 17 mm2. The suggested antenna covers the frequency range from 3.1 GHz to 12 GHz. A single notched band has been achieved at 7.4 GHz with the aid of integrating a novel closed loop resonator at the back plane of the antenna. This notched band can be utilized to alleviate the interference impact with the downlink X-band applications. Besides, a square slot was cut in the loop in order to obtain a variable notched band. With the absence and the existence of this slot, the notched band can be varied to mitigate interference of the upper WLAN band (5.72–5.82 GHz) and X-band (7.25–7.75 GHz) with UWB applications. A good agreement between measurement and simulation results was achieved, which affirms the appropriateness of this antenna for UWB applications.

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Quadruple-Mode Wideband Bandpass Filter with Improved Out-of-Band Rejection

Electronics ◽

10.3390/electronics8030300 ◽

2019 ◽

Vol 8 (3) ◽

pp. 300 ◽

Cited By ~ 5

Author(s):

Musab Hameed ◽

Gaobiao Xiao ◽

Ali Najam ◽

Lina Qiu ◽

Tayyab Hameed

Keyword(s):

Rectangular Waveguide ◽

Bandpass Filter ◽

Transverse Magnetic ◽

Center Frequency ◽

Fractional Bandwidth ◽

Compact Size ◽

Coaxial Lines ◽

Good Agreement

This paper proposes a method for designing a quadruple-mode wideband bandpass filter using off-centered perturbed metallic cylinders in a rectangular waveguide cavity with compact size and improved out-of-band rejection. Two off-centered perturbation cylinders were placed at the bottom of the rectangular waveguide cavity along with a pair of perpendicularly-fed coaxial lines, which excited four quasi-transverse magnetic (TM) modes to realize the desired passband. The height of the waveguide cavity and the shape of the perturbation cylinders were exploited to achieve an all quasi-TM modes filter with good out-of-band rejection and sharp skirt selectivity. The proposed filter operates at 2.93 GHz center frequency with 38% wide fractional bandwidth (FBW). The proposed filter is fabricated using aluminum. The measured and simulated results are in good agreement with each other.

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A Dual-Mode Bandpass Filter with Multiple Controllable Transmission-Zeros Using T-Shaped Stub-Loaded Resonators

The Scientific World JOURNAL ◽

10.1155/2014/572360 ◽

2014 ◽

Vol 2014 ◽

pp. 1-6 ◽

Cited By ~ 2

Author(s):

Zh. Yao ◽

C. Wang ◽

N. Y. Kim

Keyword(s):

High Selectivity ◽

Bandpass Filter ◽

Second Harmonic ◽

Center Frequency ◽

Harmonic Frequency ◽

Dual Mode ◽

Mode Theory ◽

Transmission Zeros ◽

Coupling Capacitance ◽

Compact Size

A dual-mode broadband bandpass filter (BPF) with multiple controllable transmission-zeros using T-shaped stub-loaded resonators (TSSLRs) is presented. Due to the symmetrical plane, the odd-even-mode theory can be adopted to characterize the BPF. The proposed filter consists of a dual-mode TSSLR and two modified feed-lines, which introduce two capacitive and inductive source-load (S-L) couplings. Five controllable transmission zeros (TZs) can be achieved for the high selectivity and the wide stopband because of the tunable amount of coupling capacitance and inductance. The center frequency of the proposed BPF is 5.8 GHz, with a 3 dB fraction bandwidth of 8.9%. The measured insertion and return losses are 1.75 and 28.18 dB, respectively. A compact size and second harmonic frequency suppression can be obtained by the proposed BPF with S-L couplings.

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X-Band Microstrip Bandpass Filter Design using Square Loop Resonator and Defected Ground Structure

Journal of Measurements Electronics Communications and Systems ◽

10.25124/jmecs.v7i1.2037 ◽

2020 ◽

Vol 7 (1) ◽

pp. 1

Author(s):

E. Edwar ◽

M.R. Yusron ◽

Dharu Arseno

Keyword(s):

Bandpass Filter ◽

Filter Design ◽

Radar System ◽

Center Frequency ◽

Q Factor ◽

Defected Ground Structure ◽

Ground Structure ◽

Telecommunication System ◽

X Band

Filter is an important part in telecommunication system including in radar system. To get the better performance in selecting the signal, a ftlter must have a good Q-Factor. In this paper, an investigation of a ftlter design for synthetic radar has been successfully done. This ftlter has been designed to work at x-band using square loop resonator (SLR). A Defected Ground Structure (DGS) has been implemented to this work to increase the Q-factor of the ftlter. The result of measurement getting that the center frequency at 9.51 GHz with the bandwidth 610 MHz and PCB size of this ftlter is 22 mm x 16 mm.

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Analysis, design and experimentation of high-pass negative group delay lumped circuit

Circuit World ◽

10.1108/cw-07-2020-0131 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Hongyu Du ◽

Rong Yang ◽

Taochen Gu ◽

Xiang Zhou ◽

Samar Yazdani ◽

...

Keyword(s):

Printed Circuit Boards ◽

Analytical Investigation ◽

Experimental Investigations ◽

Circuit Boards ◽

Content Type ◽

First Order ◽

Optimal Values ◽

Analysis Design ◽

High Pass ◽

Good Agreement

Purpose The purpose of this paper is to introduce an innovative theoretical, numerical and experimental investigations on the HP NGD function. The identified HP NGD topology under study is constituted by first order passive RC-network. The simulations and measurements confirm in very good agreement the HP NGD behaviors of the tested circuits. NGD responses with optimal values of about -1 ns and cut-off frequencies of about 20 MHz are obtained. Design/methodology/approach The identified HP NGD topology understudy is constituted by a first-order passive Resistor-capacitor RC network. An innovative approach to HP NGD analysis is developed. The analytical investigation from the voltage transfer function showing the meaning of HP properties is established. Findings This paper introduces innovative theoretical, numerical and experimental investigations on the HP NGD function. Originality/value The NGD characterization as a function of the resistance and capacitance parameters is investigated. The feasibility of the HP NGD function is verified with proofs of concept constituted of lumped surface mounted components on printed circuit boards. The simulations and measurements confirm in very good agreement the HP NGD behaviors of the tested circuits. NGD responses with optimal values of about −1 ns and cut-off frequencies of about 20 MHz are obtained.

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