Biswarup Rana

SIW based compact and dual-band equilateral triangular antennas

Abstract In this paper, a substrate integrated waveguide (SIW)-based equilateral compact and dual band triangular antennas have been proposed. A SIW-based coaxial fed equilateral triangular antenna has been initially considered. The antenna is found to resonate at 5.28 GHz corresponding to U-NII-2 WLAN band. Two sides of the said antenna are made perfect electrical conductor wall with array of metallic vias and the third side is kept open which acts like a perfect magnetic conductor (PMC) wall. A single slit has been introduced on the PMC wall of the initial antenna which causes a decrease in resonating frequency from 5.28 to 4.29 GHz. The antenna has been further miniaturized by introducing another parallel extra slit on the PMC wall which leads to a decrease in the resonating frequency to 3.3 GHz. The former antenna with single slit is found to exhibit 33% miniaturization while the latter with double slits reflects 56% miniaturization. By changing the coaxial feed location of the initial antenna at off-axis position, a dual band antenna has been realized. The dual band antenna is found to excite both TE101 and TE202 modes efficiently with corresponding resonating frequencies at 4.18 and 8.85 GHz. The prototypes have been fabricated on Arlon AD270 substrate and simulated results are compared with the measured ones. A good agreement has been observed between the simulated and measured results.

High Gain Circularly Polarized Rectangular Dielectric Resonator Antenna Array with Helical - Like Exciter

A novel (2£2) high gain circularly polarized rectangular dielectric resonator antenna array integrated with helical-like exciter is proposed. The array ofiers a maximum gain of 12.9dBi at the operating frequency. The circular polarization is obtained by incorporating helical-like exciter in the array structure. A prototype of the proposed conflguration integrated with helical-like exciter has been fabricated and tested, and the idea has been verifled. A good agreement has been obtained between the measured and simulated results.

High Gain Circularly-Polarized Dielectric Resonator Antenna Array with Helical Exciter

A novel (2£2) high-gain circularly-polarized cylindrical dielectric resonator antenna array integrated with helical exciter is proposed. The array ofiers a maximum gain of 13.8dBi at the operating frequency. The circular polarization is obtained by incorporating helical exciter in the array structure. A prototype of the proposed conflguration integrated with helical exciter has been fabricated, tested and the idea has been verifled. A good agreement has been obtained between the measured and the simulated results.

Design of SIW series fed cylindrical dielectric resonator linear array antenna

A wideband cylindrical dielectric resonator antenna (DRA) linear array fed by substrate integrated waveguide (SIW) is proposed in this paper. The array antenna is designed to operate at 14.1-14.7 GHz with 5.1% bandwidth. The resonant frequency of slots and the resonant frequency of DRAs are merged to achieve wideband characteristics. But, total gain decreases when broadband characteristics is achieved using SIW-fed dielectric resonator antenna(DRA) array compared to that of SIW-fed slot antenna array. The proposed antenna has very low level of cross-polarization and maximum gain 7.14 dBi for both E-plane and H-plane is observed.

A Compact Half-Mode SIW Based Semi-circular Antenna with X-Shaped Slot

A half mode substrate integrated waveguide (HMSIW) based semi-circular antenna is chosen which operates at 5.22 GHz within the IEEE 802.11a WLAN UNII-1 band. The same antenna is miniaturized by the inclusion of x-shaped slot. The compact antenna is found to operate at the center frequency of 4.35 GHz thereby witnessing a shift of 870 MHz from 5.22 GHz.

HMSIW-Based Miniaturized Sensing Antennas for S- and C-Band Applications

In this letter, half-mode substrate integrated waveguide (HMSIW)-based low profile, rectangular slit(s) loaded compact semicircular antennas are presented as sensors to operate in the S- and C-band. The parent sensor is a HMSIW antenna initially designed at the center frequency of 5.22GHz with a gain of 6.4 dBi for the IEEE 802.11a WLAN U-NII low-band application. The semicircular antenna has metallic vias all along the semicircular edge, thereby making it perfect electrical conductor wall while the other side devoid of vias is a perfect magnetic conductor (PMC) wall. It is miniaturized upon placing rectangular slit(s) along the PMC edge, which reduces the fundamental resonant frequency to 4.68GHz and further to 3.85GHz with single and double slits, respectively. Both antennas radiate linearly polarized wave corresponding to TM010 mode with respective gain of 5.2 and 4.6 dBi. The antenna prototypes are fabricated using Arlon AD270 substrate and good agreement between simulated and measured results are obtained.

HMSIW based equilateral triangular and semi-circular antennas for WiMAX applications

In this paper, half-mode substrate integrated waveguide (HMSIW) based equilateral triangular and semicircular antennas have been proposed and designed to operate at 3.5 GHz WiMAX frequency. Two sides of the triangular antenna and the circumference of the semi-circular antenna are made perfect electrical conductor (PEC) wall by placing arrays of metallic vias. The side of both the antennas devoid of vias acts like a perfect magnetic conductor (PMC) wall. The triangular HMSIW antenna excites TE101 mode while thesemi-circular HMSIW antenna excites TM010 efficiently. Both the antenna prototypes are designed using Arlon AD270 substrate.

Direct microstrip line-fed dielectric resonator antenna array

Abstract In this paper, a 1×4 rectangular dielectric resonator antenna array is designed using direct microstrip lines at the center frequency of 6.7 GHz for obtaining higher directive gain. A prototype has been fabricated with Arlon AD270 substrate and experimental measurements have been carried out. The array offers an impedance bandwidth of 9.6% and a maximum gain of 11.8 dBi at the operating frequency. A close agreement between simulated and measured results has been obtained.

Microstrip Line Fed Wideband Circularly-Polarized Dielectric Resonator Antenna Array for Microwave Image Sensing

A high-gain circularly-polarized (CP) wideband rectangular dielectric resonator antenna (DRA) array, fed by microstrip lines, has been proposed for microwave image sensing. Initially, two orthogonal microstrip lines have been used to feed a single element DRA for obtaining circular polarization. A four element linear array has been conceived with such CP-DRA for obtaining higher directive gain, as well as circular polarization. Both single element DRA and four elements DRA array have been fabricated with Arlon AD270 substrate and Emerson & Cuming make Eccostock HIK materials. A 17 (6.27.35 GHz) measured impedance bandwidth and 10 (6.26.85 GHz) measured axial-ratio have been noticed for the proposed DRA array. The peak gain of the proposed DRA array varies between 12.113.6dBi over the entire axial-ratio bandwidth with a maximum gain of 13.6dBi. The simulated and measured results show good agreement.

H-plane horn antenna using corrugated substrate integrated waveguide

Abstract In this paper, a novel corrugated substrate integrated waveguide (CSIW)-based H-plane horn antenna has been proposed for X-band applications. Quarter-wavelength open-circuited microstrip stubs are used in CSIW structures to achieve the TE10-like boundary condition. This structure does not require any conducting vias such as conventional substrate integrated waveguide (SIW). The antenna is fed by taper microstrip line followed by a section of CSIW operating in TE10 mode. The last section is flared section which is responsible for radiation from the structure. The structure is simulated with ANSYS made HFSS software, and a prototype is fabricated. The measurement results show an impedance bandwidth of 17.2% covering from 8.4 to 10.1 GHz. The radiation pattern is stable over the entire band of operation and has a peak gain of 12.5 dBi. The simulation results are in good agreement with the measured values.