Exponential Antipodal Vivaldi Antenna With Exponential Dielectric Lens

Hemispherical dielectric lens antennas can be designed to present multifunctional operation. Simple and efficient mathematical modeling to design these structures is presented. The constructing technique is based on the lens material and the desired operational frequency of the dielectric lens antennas. The analytical developed model was compared with both complete wave numerical simulations and practical experiments. The results indicate that the proposed equations to build hemispherical dielectric lens antennas are adequate for different operational frequencies and also for different dielectric lens materials.

Section: Correction Of the Decrease Of Nonhomogeneous Efficiency Ilmentioning

confidence: 99%

Technique for constructing hemispherical dielectric lens antennas

Santos

Fre

Spadoti

2019

“…Based on the operation theory of the ETSA, Gazi proposed the antipodal Vivaldi antenna (AVA), which used the transition of microstrip line to symmetric double sided slot line and extended the impedance bandwidth. However, its gain within the operation band was low and the maximum gain was no more than 8 to 9 dBi …”

Section: Introductionmentioning

confidence: 99%

“…In recent years, several methods have been proposed to improve the gain of Vivaldi antennas . By loading tapered and rectangular slots on the AVAs, the gains were improved, but the antenna sizes were large.…”

Section: Introductionmentioning

confidence: 99%

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A novel miniaturized antipodal Vivaldi antenna with high gain

Yin

Yang

et al. 2019

A novel antipodal Vivaldi antenna operating at an ultra‐wideband of 5.2 to 40 GHz with high gain and miniaturized size is presented in this article. By introducing a pair of radiation arms with maple‐leaf edge shape, the antenna gain is increased by 1 to 3 dB over the upper operation band (10‐40 GHz) compared to the normal antipodal Vivaldi antenna (AVA). To remain the beamwidth while increasing the gain, two rows of specialized symmetrical metallized vias are loaded on the two inside edges of the exponentially slot. By loading the resistors between the top and the bottom planes, the side lobe level at E‐plane is reduced by 3 dB. This proposed maple‐leaf antipodal Vivaldi antenna (MAVA) has the miniaturization size of 0.66λg × 0.68λg × 0.003λg. According to the simulated results, the relative bandwidth of the reflection coefficient less than −10 dB is 154%, and the gain is higher than 10 dBi over the 22 to 40 GHz band with the maximum value of 14.3 dBi. The antenna design is validated by the measurements.

“…An antipodal Vivaldi antenna surrounded with dielectric is developed in Reference for wideband application to improve gains in the range of 5 to 50 GHz, however, the structure is complex and bulky with a volume of 31.6 × 110 × 6.6 mm 3 , and it is also complicate fabrication. Exponential antipodal Vivaldi antenna with exponential dielectric lens replaced part of the substrate in antenna aperture in Reference to improve radiation characteristics, but the gain is not high in the frequency band and it is only 1.2 to 8.3 dBi in the whole operating band 3.1 to 14 GHz. The antenna also has large dimensions of 76 × 130 × 1 mm 3 .…”

Section: Introductionmentioning

confidence: 99%

A novel antipodal Vivaldi antenna loaded by linear array of sandglass‐type directors for wideband radiation characteristics improvement

Mao

Peng

Ma³

et al. 2019

Antipodal Vivaldi antenna (AVA) with five sandglass‐type director elements is proposed in this research for radiation characteristics improvement. The impedance bandwidth of the proposed antenna ranges from 2.85 to 12 GHz (9.15 GHz, 123.2%). The five director elements have different sizes and they form a symmetrical linear array in front of the antipodal Vivaldi antenna. Therefore, the director elements are responsible for secondary radiations of different frequencies, thereafter, the gain improvement of the AVA is achieved in a broad frequency band. In the 2.85 to 12 GHz frequency band, the antenna gain is increased by 1 to 2.65 dBi and the 3 dB beamwidths are reduced. Thus, a high gain AVA is achieved with gains of 6.52 to 11.55 dBi in the whole frequency band. A prototype of the proposed antenna is fabricated and measured, and the simulated and measured results agree well with each other.