Achieving high gain and large bandwidth using hybrid DR antennas to feed short horns. Nasimuddin 1 and Karu Esselle 2 1 Institute for Infocomm Research, Singapore 2 Centre for Electromagnetic and Antenna Engineering Department of Electronic Engineering, Macquarie University
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Nasimuddin1 and Karu Esselle2
1Institute for Infocomm Research, Singapore
2Centre for Electromagnetic and Antenna Engineering
Department of Electronic Engineering, Macquarie University
Sydney, NSW 2109, Australia
In most cases the gain enhancement is limited or the structure is complex. We propose to integrate DRAs and hybrid antennas with surface mount short horns to enhance gain significantly.
Typical Structure of DRA integrated to a surface mounted short horn (SMSH)
Role of DRA:
Feed to SMSH
The SMSH is excited by the DRA.
Total Radiation is a combination of the radiation from DRA and the aperture of the SMSH.
Supporting Material of SMSH also effect the radiation properties.
Design of SMSH for Maximum Gain
Maximum Gain for around 8.50 mm horn height
Fabricated DRA with SMSH
SMSH fabricated using solid Copper block
Gain at 5.95 GHz:
Theoretical gain : 8.8 dBi
Measured gain : 8.5 dBi
Measured gain of DRA alone is 3.7 dBi
For SMSH fabricated from copper block
Gain enhancement due to SMSH is 4.8 dB
Another Prototype with DRA
Gain of aperture coupled DRA with different horns (metal support and foam support)
Gain at 5.95 GHz:
Metal gain is 8.50 dBi
Air gain is 9.84 dBi
Metal gain is 8.80 dBi
Air gain is 9.4 dBi
To increase the bandwidth, we
replaced the DRA with a hybrid
Dielectric Resonator on patch (DRoP) antenna
Feed Microstrip Line :
W = 1.16 mm, stub length = 2.6 mm
h = 0.508 mm, r = 3.38, tan = 0.0022
Lower coupling aperture: 8.4 mm 0.9 mm
Upper coupling aperture: 6.8 mm 0.7 mm
Patch substrate: 12 mm 16 mm
h = 0.762 mm, r = 2.45, tan = 0.001
Patch : 9.05 mm 8.1 mm
7.02 mm 12.0 mm
h = 6.35 mm, r = 9.8, tan = 0.002
Fabricated DRoP with SMSH
Theoretical and Experimental results of the rectangular DRoP antenna with SMSH
Measured Impedance bandwidth is 24.4%
Theoretical and measured Gain
E & H-plane radiation patterns of the DRoP antenna with SMSH at 6.5 GHz
Comparison of rectangular and Cross-DR
on patch: VSWR
The measured 2:1VSWR impedance bandwidth of the rectangular DR on patch is 6.04 to 8.0 GHz (27.9%) and cross DR on patch is 23% (6.06GHz to 7.64GHz).
The measured gain of both antennas is more than 9dBi within the 2:1 VSWR impedance bandwidth.