Strong demand for 4G buoys Filtronic Shares in Filtronic jumped up to a fifth on Monday after strong demand for fourth-generation or "4G" products boosted the telecoms equipment maker's revenues and triggered earnings upgrades. Sales in Filtronic's wireless division more than doubled year-on-year to £11.9m for the six months to 30 November because of widespread adoption of 4G services , which provide faster internet access to mobile users. The wireless division swung into the black, posting a £1.8m operating profit compared to a £0.4m loss in the corresponding period last year. Wireless now accounts for 80 per cent of the group's turnover. Alan Needle, chief executive, said: "We expect to see growth coming from wireless for the foreseeable future." Total revenues jumped 56.2 per cent year-on-year to £16.4m. Analysts upped their forecasts in response, with Panmure Gordon increasing its pre-exceptionals forecast for earnings before interest, tax, depreciation and amortisation by a quarter. The group's broadband division struggled, however, posting half-year revenues down 15 per cent year-on-year to £4.5m and an operating loss of £1.3m. Mr Needle was nonetheless bullish about the division's future: "It has the same exposure to 4G growth [as the wireless division]. They are not mutually exclusive. It's good that we have a dual exposure - there's not a huge number of companies that do. Filtronic posted a loss before tax of £1.2m, which translated into a diluted loss per share of 1.03p. Shares in the group closed up 15.7 per cent at 46p. Elsewhere in the telecoms sector, Anite, which tests smartphone signals, paid €31m in cash for a radio emulating product owned by Finnish rival Elektrobit. The product, named Propsim, helps mimic "real-life" situations for testing smartphone signals, such as simulating how a signal fares when a high-speed train goes past. Customers increasingly demand challenging testing environments, said Christopher Humphrey, the group's chief executive. It adds a little bit of extra difficulty. It's not a pass/fail test, it's more about the quality - it's subjective," he said. This is the way simulations are going. The explosion in demand for smartphones has proved a major boon for Anite, which reported a 30 per cent year-on-year jump in pre-tax profits for the six months to 31 October. "[Customers want to] try and reduce the amount of quality problems while they're in the R&D stage," said Mr Humphrey. To fix bugs after the handset has been launched is a bigger and more expensive problem. Just under half the deal will be financed with cash while the remainder comes from an existing bank facility, which will be paid off in about 18 months, according to the group's finance director. Shares in Anite closed up 3.6 per cent at 145.8p.