scholarly journals Effect of defected ground plane on the bandwidth of parallel line-coupled bandpass filter at 3.3 GHz

2017 ◽  
Vol 6 (3) ◽  
pp. 62
Author(s):  
Charmolavy Goslavy Lionel NKOUKA MOUKENGUE ◽  
Désiré LILONGA-BOYENGA
Keyword(s):  
Bandpass Filter ◽  
Photonic Band Gap ◽  
Ground Plane ◽  
Broad Band ◽  
Parallel Line ◽  
Center Frequency ◽  
Band Frequency ◽  
Filter Bandwidth ◽  
Band Gap Structure ◽  
Defected Ground Plane

The effect of a defected ground plane made up of photonic band-gap structure of circular slots or patches of the radii r on the bandwidth of a parallel line- coupled bandpass filter, realized on a dielectric substrate and of 3.3 GHz center, frequency is highlighted in this study. The use of defected ground plane increases the filter bandwidth and allows its use on a broad-band frequency.

Compact stub type microstrip bandpass filter using defected ground plane

2004 ◽  
Vol 14 (4) ◽  
pp. 136-138 ◽  
Author(s):  
A. Abdel-Rahman ◽  
A.K. Verma ◽  
A. Boutejdar ◽  
A.S. Omar
Keyword(s):  
Bandpass Filter ◽  
Ground Plane ◽  
Defected Ground Plane

scholarly journals Single Feed Aperture-Coupled Wideband Dielectric Resonator Antenna with Circular Polarization for Ku-Band Applications

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Joshua M. Patin ◽  
Satish K. Sharma
Keyword(s):  
Circular Polarization ◽  
Dielectric Resonator ◽  
Ground Plane ◽  
Axial Ratio ◽  
Resonant Mode ◽  
Center Frequency ◽  
Back Side ◽  
Dielectric Resonator Antenna ◽  
Band Frequency ◽  
Ku Band

A novel single feed aperture-coupled wideband dielectric resonator antenna (DRA) exhibiting righ-handed circular polarization (RHCP) operating in the Ku-band frequency range is presented. The aperture-coupled single feed design utilizes back-side microstrip excitation through a novel bow-tie-shaped cross-slots in the ground plane. Extensive simulation parametric studies resulted in a 3 dB axial ratio (AR) bandwidth of 17.24% at a center frequency of 13 GHz, where the dielectric resonator is excited in its HEM11δresonant mode. A prototype DRA was fabricated with some limitations and experimentally verified for the impedance matching and radiation patterns showing circular polarization.

scholarly journals Design of an Offset Posts K- band Bandpass Filter using Substrate Integrated Waveguide for Microwave Applications

2020 ◽  
Vol 8 (6) ◽  
pp. 1056-1058
Keyword(s):  
Bandpass Filter ◽  
Dielectric Material ◽  
Ground Plane ◽  
Center Frequency ◽  
Pass Band ◽  
Substrate Integrated Waveguide ◽  
Low Loss ◽  
Communication Devices ◽  
Good Agreement ◽  
K Band

In this paper, an offset posts K-band bandpass filter has been designed using substrate integrated waveguide (SIW). SIW is formed inside a dielectric material by applying a top metal over the ground plane and trapping the structure on either side with rows of plated vias. SIW is effective and efficient solution in waveguide technique. The slotted windows are cut in tapered transition of SIW filter to attain low loss. The proposed filters are designed at 23 GHz center frequency. The simulated results exhibit low losses and sharp roll off characteristics in pass band. There is good agreement between the simulated results and the experimental results. The proposed filter is suitable for use in microwave communication devices.

A Bulk Micromachined Tunable Dual-Mode Microwave Bandpass Filter on Coplanar Waveguide

2008 ◽  
Author(s):  
Min Miao ◽  
Jingpeng Bu ◽  
Liwei Zhao ◽  
Yufeng Jin ◽  
Yangfei Zhang
Keyword(s):  
Satellite Communication ◽  
Bandpass Filter ◽  
Rf Mems ◽  
Coplanar Waveguide ◽  
Dielectric Substrate ◽  
Dual Mode ◽  
Band Frequency ◽  
Filter Bandwidth ◽  
Filter Performance ◽  
Mode Resonator

This paper proposes a bulk micromachined bandpass filter on 0.5mm-thick Pyrex glass, whose operation is based on the splitting of the odd and even degenerate mode in a dual-mode resonator, with the addition of a perturbation element. In such a way, a filter may require only half resonators of a traditional one, resulting in a more compact configuration over those ever reported. A 4%-bandwidth bandpass filter centered at 17GHz was designed. The square-ring-like coplanar waveguide (CPW) act as a dual-mode resonator, and an open-circuited stub attached to the inner corner of the square-ring acts as the perturbation element and dominates the filter bandwidth. The two bulk-micromachined switches for tuning are placed symmetrically along the diagonal line. Since the electrical length of CPW is extended after being loaded by capacitive switches, both the degenerate resonating frequencies and the filter mid-band frequency are shifted downward. Theoretical formulas are derived for various actuation states of all the switches. The filter performance is analysed also using finite-element fullwave tools. A frequency shift of 0.6GHz is seen which is close to 0.58GHz obtained from analytical solutions. Both the original and tuned state come with satisfying microwave performance, i.e. low passband insertion-loss (< 0.5dB) and return-loss (< −15dB) and high stopband rejection. It is also shown that the simulated result is in good agreement with theoretical solutions. The bulk microfabrication is shown to be much simpler than surface micromachining conventionally used for RF MEMS switches. Since the bridge skeleton is Si, thermal mismatch between all-metal bridge and dielectric substrate is avoided, and reliability at elevated temperature is guaranteed or at least greatly improved. Besides, the p++ doped Si line patterned simultaneously with the microbridges, can also be used as a DC biasing resistor, which can eliminate the additional steps to fabricate the resistive alloy line. The tested results of the fabricated switch samples are also shown. The device may be a good candidate for novel Ku-band inter-scientific satellite communication or wireless networking.

scholarly journals A UWB Antenna Array Integrated with Multimode Resonator Bandpass Filter

Electronics ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 607
Author(s):  
Sharif Ahmed ◽  
Tan Kim Geok ◽  
Mohamad Yusoff Alias ◽  
Ferdous Hossain ◽  
Hussein Alsariera ◽  
...  
Keyword(s):  
Antenna Array ◽  
Bandpass Filter ◽  
Ground Plane ◽  
Center Frequency ◽  
Impedance Bandwidth ◽  
Uwb Antenna ◽  
Compact Size ◽  
Measurement Results ◽  
Uwb Applications ◽  
Array Performance

This paper presents a novel design of a modified ultrawideband (UWB) antenna array integrated with a multimode resonator bandpass filter. First, a single UWB antenna is modified and studied, using a P-shape radiated patch instead of a full elliptical patch, for wide impedance bandwidth and high realized gain. Then, a two-element UWB antenna array is developed based on this modified UWB antenna with an inter-element spacing of 0.35 λL, in which λL is the free space wavelength at the lower UWB band edge of 3.1 GHz, compared to 0.27 λL of a reference UWB antenna array designed using a traditional elliptical patch shape. The partial ground plane is designed with a trapezoidal angle to enhance matching throughout the UWB frequency range. The mutual coupling reduction of a modified UWB antenna array enhances the reflection coefficient, bandwidth, and realized gain, maintaining the same size of 1.08 λ0 × 1.08 λ0 × 0.035 λ0 at 6.5 GHz center frequency as that of the reference UWB antenna array. The UWB antenna array performance is investigated at different inter-element spacing distances between the radiated elements. To add filtering capability to the UWB antenna array and eliminate interference from the out-of-band frequencies, a multimode resonator (MMR) bandpass filter (BPF) is incorporated in the feedline while maintaining a compact size. The measurement results showed a close agreement with simulated results. The proposed UWB filtering antenna array design achieved a wide fractional bandwidth of more than 109.87%, a high realized gain of more than 7.4 dBi, and a compact size of 1.08 λ0 × 1.08 λ0 × 0.035 λ0 at 6.5 GHz center frequency. These advantages make the proposed antenna suitable for UWB applications such as indoor tracking, radar systems and positioning applications.

scholarly journals A Novel Wideband Bandpass Filter using H-shaped DGS

2018 ◽  
Vol 8 (4) ◽  
pp. 2021
Author(s):  
Van-Phuong Do ◽  
Duy-Manh Luong ◽  
Chi-Hieu Ta ◽  
Minh-Tan Doan
Keyword(s):  
Microstrip Line ◽  
Return Loss ◽  
Bandpass Filter ◽  
Ground Plane ◽  
Wireless Systems ◽  
Wide Band ◽  
Center Frequency ◽  
Dual Plane ◽  
Defected Ground Structures ◽  
Ground Structures

<p>This paper presents a novel compact wide-band bandpass filter (BPF) having good selectivity. It is designed using a dual-plane structure which consists of a parallel-coupled microstrip line on the upper surface and three H-shape defected ground structures (DGS) on the ground plane. By adding three H-shape DGS units on the ground plane, then properly adjusting their dimensions and position, the bandwidth and selectivity of the designed filter can be significantly improved. A compact prototype of wide-band microstrip bandpass filter has been designed, fabricated and measured for the wireless systems applications. The filter exhibits a center frequency at 4.8 GHz, passband from 2.8 GHz to 6.8 GHz with best insertion loss and return loss of 0.8 dB and 40 dB, respectively. The measured results agrees well with the theoretical expectations validating the proposed design.</p>

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