Brian Collins

Antennas, propagation and ancillaries . This list shows some of the types of antennas, links and ancillary systems I have designed, brought into production, installed and commissioned.
Antennas for worn devices	Single- and multi-band IFAs, MDAs, notches, and loops for pendant and wrist-worn devices.
Base station antennas	Microstrip dipole arrays, patch arrays, vertical and dual polarized; Wideband, dual-band and tri-band arrays. Feed network design and optimisation. Arrays with remotely-controlled adjustable electrical tilt.
Cables and waveguides	Installation and measurement of coaxial cables and waveguide systems. Fitting and testing of terminations and pressurisation systems. Fault finding. Design of transitions, elbows, links and connectors.
Compact anennas for consumer terminals	PILAs, PIFAs, monopoles Dielectric-loaded antennas, loops, notches, wideband, dual-band and more. Design of platforms for GSM, 3G, 4G, GPS, ISM, WiFi, RFID, SRDs.
Dipoles and dipole arrays	Dipoles, linear arrays, circular arrays, folded/multiple-folded dipoles, dipole feed units, crossed dipoles. Wire, rod and microstrip constructions. Broadband loaded dipoles, NVIS antennas. Discones and bi-conical dipoles, coaxial dipoles, monopoles. Lindenblad antennas.
Digitally tuned antennas	Antennas tuned/matched using digitally-controlled components.
Filters	Filters, sound/vision combiners, channel combiners and duplex filters, MF transmitter combiners. Microstrip, coaxial, resonant ring and other formats.
Handset antennas	Internal multi-band PIFAs and PILAs, external stubby antennas. Dielectric antennas, hybrid dielectric-excited antennas and the optimisation of handsets for efficient RF performance.
Helices	Gains to 20dBi, multiple helical arrays, dual and wideband helices, backfire helices, radial-mode helices. Cavity-backed helices. Bifilar and quadrifilar helices.
HF Antennas	Broadband dipoles, LPDAs, rhombics, quadrants, sloping and inverted Vees, conical/biconical radiators, arrays, feed systems, lightweight transportable antennas, reconfigurable antennas, NVIS antennas, covert antennas. On site maintenance and performance evaluation
LF and MF Antennas	Base-fed masts, shunt/skirt-fed masts and towers, umbrella and Tee antennas. Driven masts with passive reflectors and directors, multi-mast arrays, multi-frequency ATUs, multi-mast, multi-frequency arrays. Switching, transmitter combiners. Insulator system design. Ground system design. MF antennas carrying VHF and other antennas, lighting and sampling systems. Powers to 1200kW. Hardware specification, design, installation and maintainance.
Log-periodic antennas	HF, VHF and UHF log-periodics with conventional and novel geometries with linear and circular polarization. LPDA feed units for reflector antennas. Log-spirals.
Loop arrays	Novel HF active loop elements, loop arrays, steerable arrays, multi-beam arrays, transportable arrays, omnidirectional arrays, compact UHF loops/notches for consumer applications.
Measurement and testing	Extensive variety of parameters and methods. Near and far-field systems, SATIMO Stargate, SAR and PIM measurements, power tests, EMP tests. Mechanical and environmental testing and design evaluation.
Microstrip networks	Hybrids, power dividers, filters, wideband corporate feed networks.
Panels and panel arrays	Panels arrays for TV and FM radio broadcasting with dipole or slot elements. Panel arrays for broadcasting and mobile comms. Linear and circular polarization. Azimuth and elevation pattern synthesis. Broadband, high-power and military applications.
Patches	Linear, dual-polar and CP patches. Rectangular, square and circular patches, stacked and parasitically loaded patches, linear and planar patch arrays. Slot-fed patches, patches with parasites for control of bandwidth or beamwidth. Linear and circular arrays. Conformal cylindrical arrays.
Propagation	Design of systems and analysis of groundwave, ionospheric, LoS, obstructed path, tropospheric, ground/air and ground/satellite propagation.
Reflector antennas and feeds	Grid and solid dishes. Stick-feeds, back-fire helical feeds, horns, corrugated horns, dipole and LPDA feeds.
Power division networks	Open line, coaxial, lumped-element and microstrip networks. Coaxial power dividers, hybrids and other components.
Slots	Slot antennas, cavity-backed slots, dual-band slots, crossed slots, slot arrays.
VHF/UHF antennas	Panel antennas for communications and broadcasting. Yagis from 2 - 20 elements, arrays of multiple Yagis. Dipole-fed, cavity-fed (UHF/SHF), TV receiving antennas.
Vivaldi antennas	Vivaldi antennas for wide band operation.
Accessories	Hybrids, directional couplers, adjustable phase shifters, bridge networks, Butler matrices, cavity filters, combiners, baluns, coaxial components and transmission lines.
Systems	Design of AM broadcast systems, VSAT hubs and VSAT terminal systems. Configuration of satellite earth stations. Remote control & monitoring systems, standby power systems, AISG interfaces.

Antennas, propagation and ancillaries .This list shows some of the types of antennas, links and ancillary systems I have designed, brought into production, installed and commissioned.

Antennas, propagation and ancillaries
.
This list shows some of the types of antennas, links and ancillary systems I
have designed, brought into production, installed and commissioned.