Abstract:
Leaky wave antenna (LWA) finds good use in many applications due to its unique features. One
of the most important features is beam scanning with frequency. Because of this feature, LWA is
favored by systems that require beam scanning, such as radars and electromagnetic imaging
systems. The Leaky Wave Antenna presented in this thesis benefits from Substrate Integrated
Waveguide Technology. For microwave circuits, Substrate Integrated Waveguide (SIW)
Technology offers compactness, planar architecture, simplicity in manufacture, and cost
effectiveness. The antenna operates at a central frequency of 15GHz and was designed on a
ROGERS RT DUROID 5870 substrate with a dielectric constant of ∈𝑟= 2.33. Transverse slots,
longitudinal slots, and inclined combination of both are included in the proposed design, which
are tapered at both ends. For feeding the proposed antenna, microstrip to SIW transition is
designed. The proposed SIW LWA's simulation results reveal a maximum gain of 13.5dBi. The
designed SIW LWA provides single beam scanning with frequency in the band that ranges from
10GHz to 20GHz. With the excitation of ports mirror image of same scanning is achieved in
different quadrants, thus based on the excitation of different ports the total scanning achieved for
single beam by the proposed antenna is 164°. In order to achieve the scanning at fixed frequency
the slotsin the ground of the proposed antenna are introduced. This resulted in large space scanning
of 352° with different port excitation. Consequently, for this antenna when port-1 is excited, two
beams in 2
nd and 3
rd quadrant for fixed frequency are achieved with a total scanning of 176° while
for port-2 excitation 176° scanning in quadrant 1st and 4th is achieved. Thus, total of 352° large
space scanning is achieved along with scanning at endfire with frequency band ranges from
11.5GHz-19.3GHz. The designed antennas work for both fixed frequency beam scanning and
frequency-controlled beam scanning. These antennas find good use in applications like 5G
communication system, low-cost high-resolution radars, human tracking, and Bio medical devices
