Front-to-back ratio improvement of a microstrip patch antenna by ground plane edge shaping

Cho, T. J.; Lee, H. M.

doi:10.1109/aps.2010.5561174

Cited by 13 publications

(5 citation statements)

References 3 publications

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“…Therefore, in order to mitigate the back-lobe radiation and to achieve a directional radiation pattern from a slot antenna excitation, several back-lobe suppression techniques were employed in the literature. Most common techniques are: using electromagnetic bandgap structures [17,18], isolated surfaces [19], inductor and resistor loading [20,21], GND plane meandering and edge serration [22,23], and using additional reflector layers in a three-dimensional (3D) configuration [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. The majority of these techniques are quite complex and occupy large size which is not suitable to be employed in the design of compact printed MIMO antenna systems.…”

Section: Introductionmentioning

confidence: 99%

Frequency reconfigurable Yagi‐like MIMO antenna system with a wideband reflector

Jehangir

Hussain

Hussein

et al. 2020

IET Microwaves, Antennas & Propagation

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A compact single layer frequency reconfigurable Yagi‐like multiple‐input multiple‐output (MIMO) antenna system is presented based on a half‐ring closed loop slot excitation. The traditional omnidirectional pattern of a slot antenna is made directional by using a single slot‐based complementary wideband reflector (CWBR) element. The proposed CWBR is compact in size, simple in construction, and is based on a single‐layer geometry unlike complex multi‐layer reflectors used in the literature. It improves the front‐to‐back ratio between 5 and 17 dB in the entire frequency range covering 2.5–4.5 GHz. The proposed reconfigurable MIMO antenna system covers the LTE and WiMAX bands with a minimum measured bandwidth of 200 MHz per covered bands. The frequency reconfigurability is achieved by reactively loading the slot loop with varactor diodes. The overall size of the proposed antenna system is 40×100×0.76thinmathspacenormalmm3, making it suitable for tablet handheld devices and access points. It has a maximum measured peak gain of 5 dBi and total measured radiation efficiency of 78%. The proposed MIMO antenna system has port isolation of >10 dB within the entire band of operation. The radiation patterns are isolated in space from each other and ensure very low envelope correlation coefficient.

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Section: Introductionmentioning

confidence: 99%

Frequency reconfigurable Yagi‐like MIMO antenna system with a wideband reflector

Jehangir

Hussain

Hussein

et al. 2020

IET Microwaves, Antennas & Propagation

View full text Add to dashboard Cite

show abstract

“…Therefore, to reduce the back-lobe radiation and to achieve a directional radiation pattern from a slot antenna excitation, several back-lobe reduction techniques were employed in the literature. Such techniques include electromagnetic bandgap (EBG) structures [9,10], isolated surfaces [11], inductor and resistor loading [12,13], ground plane meandering and edge serration [14,15], and using reflector layers in a 3D stacked configuration [5,[16][17][18]. The works presented in [5], and in [16][17][18] are either Yagi-like or Yagi works (not MIMO) and have used slot antenna as the exciting element.…”

Section: Introductionmentioning

confidence: 99%

Stacked frequency reconfigurable Yagi‐like MIMO antenna system

Hussain

Jehangir

Khan

et al. 2020

IET Microwaves, Antennas & Propagation

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In this work, a 2‐layer frequency reconfigurable Yagi‐like multiple‐input–multiple‐output (MIMO) antenna system is proposed based on a closed pentagonal slot‐loop excitation. The MIMO system consists of 4 identical active antenna elements reactively loaded with varactor diodes to achieve frequency reconfigurability over a band from 1.5 to 2.1 GHz. The distinguishing feature of the proposed work is achieving Yagi‐like directional characteristics over a very wide frequency band. The conventional omni‐directional pattern of a slot antenna is made directional by using a parasitic metallic reflector layer below the substrate. By using the reflector element, the back‐lobe radiation is highly suppressed and a front‐to‐back ratio of 5–13 dB is achieved within the entire frequency band of operation. The proposed design is compact with an overall size of 100×100×20thinmathspacenormalmm3, and a reflector size of 110×110thinmathspacenormalmm2. A single element has a maximum peak gain of 4 dBi and total measured radiation efficiency of 76%. The antenna system also shows good MIMO performance with high port isolation of 11.3 dB and very low envelope correlation coefficient values within the operational band.

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“…The ground plane edge modification with soft surface is presented in [9] for single microstrip patch antenna at 2.4GHz. But the design of unit cell itself is complex and broadside gain decreases by 1dBi.The concept of ground plane edge shaping is used to increase front to back ratio [10]. But there the peak gain decreases by 2dBi with improvement in FBR.…”

Section: Introductionmentioning

confidence: 99%

A Novel Back Lobe Reduction Technique for Microstrip Antenna Array Using Partial Ground and DGS

Kumar¹,

Satyanarayana²,

Singh³

2019

IJIES

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In this communication, back lobe reduction in microstrip antenna array using partial ground and defected ground structure (DGS) is presented. An eight element rectangular microstrip patch antenna array is designed for Xband frequency of 9.1GHz, with a peak gain of 12.04dBi and back lobe level of -13.75dB. Using partial ground plane technique; the back lobe level is reduced to -18.28dB. Then, by placing defected ground structure (DGS) slots on the ground plane, the S 11 is further reduced by 7.65dB and back lobe level is reduced to -18.82dB. This microstrip antenna array with partial ground plane and DGS technique has a peak gain of 12.41dBi. By using this novel technique, the front to back ratio has improved from 19dB to 24.23dB. The Simulations are carried using High frequency structured simulator (HFSS) software and compared with measured results. A difference of 0.96dB is observed between simulated and measured back lobe level.

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Front-to-back ratio improvement of a microstrip patch antenna by ground plane edge shaping

Cited by 13 publications

References 3 publications

Frequency reconfigurable Yagi‐like MIMO antenna system with a wideband reflector

Frequency reconfigurable Yagi‐like MIMO antenna system with a wideband reflector

Stacked frequency reconfigurable Yagi‐like MIMO antenna system

A Novel Back Lobe Reduction Technique for Microstrip Antenna Array Using Partial Ground and DGS

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