A 874 GHz Mixer Block Integrated Spline Horn and Lens Antenna for the ISMAR Instrument
Paper in proceeding, 2015

In this paper, we present the design of a 874 GHz mixer block-integrated antenna for the ISMAR Instrument. The spline horn antenna with a dielectric lens (Teflon) is used to fulfill the requirement of an on-axis Directivity exceeding 32 dBi. The well designed spline horn offers very high Gaussian Coupling, exceeding 97%. This property of spline horn further helps to achieve very rotationally symmetric beam even after the lens with very low cross-polarization (< -30 dB) as well as low side-lobe levels (< -28 dB). The integrated spline horn with lens has far-field Full Width at Half Maximum of 4.2±0.2° over the frequency range of 860 GHz to 890 GHz. The simulated antenna losses are less than 0.5 dB and the antenna input reflection coefficient including the circular to rectangular waveguide (WR1.2) transition is better than -20 dB.

Spline Horns




Gaussian Coupling


Yogesh Karandikar

Omnisys Instruments

Arvid Hammar

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

Peter Sobis

GigaHertz Centre

Per Forsberg

Omnisys Instruments

Anders Emrich

Omnisys Instruments

Jan Stake

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

GigaHertz Centre

9th European Conference on Antennas and Propagation, EuCAP 2015, Lisbon, Portugal, 13-17 May 2015

978-889070185-6 (ISBN)

Areas of Advance

Information and Communication Technology

Driving Forces

Sustainable development


Nanofabrication Laboratory

Subject Categories

Other Electrical Engineering, Electronic Engineering, Information Engineering



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9/6/2018 1