scholarly journals A Ka-Band Circular Polarized Waveguide Slot Antenna with a Cross Iris

2020 ◽  
Vol 10 (19) ◽  
pp. 6994
Author(s):  
Sung-Joon Yoon ◽  
Jae-Hoon Choi
Keyword(s):  
Reflection Coefficient ◽  
Impedance Matching ◽  
Axial Ratio ◽  
Experimental Results ◽  
Slot Antenna ◽  
Ka Band ◽  
Circularly Polarized ◽  
Waveguide Slot ◽  
Waveguide Slot Antenna

A Ka-band circularly polarized (CP) waveguide slot antenna with a cross iris is proposed. To achieve the CP characteristic (LHCP) in the antenna, a hexagonal shaped cavity is used. The impedance matching is improved by adjusting the sizes of the hexagonal cavity and a rectangular matching cavity. To enhance the axial ratio bandwidth, a cross iris is used with two arms of different lengths. From experimental results, the proposed antenna has a 3 dB axial ratio bandwidth of 6810 MHz (31.72 GHz–38.53 GHz). The −10 dB reflection coefficient bandwidth of the proposed antenna ranges from 31.51 GHz to 39.21 GHz (7700 MHz).

Compact Ka-band Frequency Selector Base on Waveguide Slot Antenna and Luneburg Lens

2021 ◽  
Author(s):  
Jiayi Zhao ◽  
Zhipeng Liu ◽  
Yong Liu ◽  
Hongda Lu ◽  
Jialin Fan ◽  
...  
Keyword(s):  
Slot Antenna ◽  
Band Frequency ◽  
Ka Band ◽  
Waveguide Slot ◽  
Luneburg Lens ◽  
Waveguide Slot Antenna ◽  
Frequency Selector

Achievements on circularly polarized horn-fed metallic electromagnetic band gap antenna design

2013 ◽  
Vol 5 (4) ◽  
pp. 507-520 ◽  
Author(s):  
Eric Arnaud ◽  
Régis Chantalat ◽  
Thierry Monediere ◽  
Emmanuel Rodes ◽  
Marc Thevenot
Keyword(s):  
Band Gap ◽  
Axial Ratio ◽  
Experimental Results ◽  
Antenna Design ◽  
Space Applications ◽  
Electromagnetic Band Gap ◽  
Ka Band ◽  
Circularly Polarized ◽  
Comprehensive Study

This paper presents a comprehensive study on the design of a 30 GHz, circularly polarized (CP), single horn-fed, metallic electromagnetic band gap (EBG) antenna. Three different approaches have been studied in order to create a 20 dBi antenna with an axial ratio (AR) lower than 1 dB over a 500 MHz bandwidth. Based on theoretical and experimental results, a conclusion is given on the best solution to obtain the desired characteristics. Perspectives and guidelines are also given for the design of multi-feed EBG antenna as a reflector focal feed for Ka-Band Space Applications.

A Compact Broadband Circularly Polarized Slot Antenna for Universal UHF RFID Reader and GPS

2021 ◽  
Vol 36 (5) ◽  
pp. 589-595
Author(s):  
Canjie Chen ◽  
Quanyuan Feng
Keyword(s):  
Coplanar Waveguide ◽  
Impedance Matching ◽  
Axial Ratio ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Uhf Rfid ◽  
Circularly Polarized ◽  
Rectangular Slot ◽  
Polarization Characteristics ◽  
Ground Plate

A novel compact printed broadband circularly polarized slot antenna is proposed in this paper. The antenna consists of an inverted L-shaped coplanar waveguide feed structure and a square ground plate loaded with three rectangular slots. The antenna achieves good impedance matching and circular polarization characteristics by adjusting the size of the L-shaped band and the rectangular slot. The simulation results show that the antenna has a 10-dB impedance bandwidth of 1360 MHz (690-2050 MHz) and a 3 dB axial ratio (AR) bandwidth of 490 MHz (770-1260 MHz). Additionally, the maximum gain reached 4.02 dBi. The antenna proposed in this paper can be applied to UHF RFID and GPS frequency bands.

Broadband CPW-Fed Circularly Polarized Square Slot Antenna for Universal UHF RFID Handheld Reader

2021 ◽  
Vol 36 (6) ◽  
pp. 747-754
Author(s):  
Rui Ma ◽  
Quanyuan Feng
Keyword(s):  
Low Cost ◽  
Coplanar Waveguide ◽  
Impedance Matching ◽  
Axial Ratio ◽  
Polarization Characteristic ◽  
Dielectric Substrate ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Uhf Rfid ◽  
Circularly Polarized

This paper presents a new coplanar waveguide (CPW)-fed circularly polarized square slot antenna (CPSSA). The proposed antenna uses an inverted Z-shaped feedline protruded from the signal line of the feeding CPW. Circularly polarized (CP) radiation can be achieved by adequately inserting the arc-shaped grounded strip into the upper right corner of the square slot. The widened vertical tuning stub on the L-shaped grounded strip can improve impedance matching and axial ratio (AR) performance. The measured results indicate that the 10 dB impedance bandwidth is 620 MHz (652-1272 MHz), and the 3 dB axial ratio bandwidth is 320 MHz (840-1160 MHz), which has a broadband characteristic. In the range of the universal UHF RFID band, the measured peak gain is about 4.4 dBi. The proposed CPSSA uses low-cost FR4 material as the dielectric substrate. The overall size of the antenna is 119 × 119 × 0.5 mm3. The proposed antenna has a simple structure, easy processing, good performance, wide operating bandwidth, and dual circular polarization characteristic. It can be applied to the universal UHF RFID handheld reader environment.

scholarly journals Wideband Circularly Polarized SIW Antenna Array That Uses Sequential Rotation Feeding

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Fang-Fang Fan ◽  
Ze-Hong Yan ◽  
Wei Wang
Keyword(s):  
Antenna Array ◽  
Delay Line ◽  
Impedance Matching ◽  
Axial Ratio ◽  
Slot Antenna ◽  
Feeding Method ◽  
Circularly Polarized ◽  
X Band ◽  
Measured Impedance ◽  
Diamond Ring

A wideband right-handed circularly polarized (CP) substrate integrated waveguide- (SIW-) based diamond ring-slot antenna array at the X-band is presented in this study. The array consists of four elements that exhibit wideband impedance matching characteristics and good radiation performance. The array also employs a sequential rotation feeding method to achieve the wideband axial ratio (AR) bandwidth. The feeding network is based on the SIW power divider with a delay line related to sequential rotation feeding. To validate our design, an antenna array is fabricated and measured. The measured impedance and AR bandwidths are 19.2% (VSWR<2) and 14.1% (AR<3 dB), respectively. Moreover, the antenna has a stable CP peak gain of more than 12 dBic from 10.1 GHz to 10.7 GHz.

A Broadband Circularly Polarized Cross-slotted Patch Antenna with Horizontal Meandered Strip (HMS)

Frequenz ◽  
2020 ◽  
Vol 74 (5-6) ◽  
pp. 191-199
Author(s):  
M. K. Verma ◽  
Binod K. Kanaujia ◽  
J. P. Saini ◽  
Padam S. Saini
Keyword(s):  
Circular Polarization ◽  
Patch Antenna ◽  
Impedance Matching ◽  
Axial Ratio ◽  
Impedance Bandwidth ◽  
Radiation Patterns ◽  
Circularly Polarized ◽  
Feeding Technique

AbstractA broadband circularly polarized slotted square patch antenna with horizontal meandered strip (HMS) is presented and studied. The HMS feeding technique provides the good impedance matching and broadside symmetrical radiation patterns. A set of cross asymmetrical slots are etched on the radiating patch to realize the circular polarization. An electrically small stub is added on the edge of the antenna for further improvement in performance. Measured 10-dB impedance bandwidth (IBW) and 3-dB axial ratio bandwidth (ARBW) of the proposed antenna are 32.31 % (3.14–4.35 GHz) and 20.91 % (3.34–4.12 GHz), respectively. The gain of the antenna is varied from 3.5 to 4.86dBi within 3-dB ARBW. Measured results matched well with the simulated results.

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